Updated on 2024/06/24

写真a

 
Kubota Yoshiki
 
Organization
Graduate School of Science Department of Physics Professor
School of Science Department of Physics
Title
Professor
Affiliation
Institute of Science
Contact information
メールアドレス
Affiliation campus
Nakamozu Campus

Position

  • Graduate School of Science Department of Physics 

    Professor  2022.04 - Now

  • School of Science Department of Physics 

    Professor  2022.04 - Now

Degree

  • Doctor(Engineering) （ Others ） (   Nagoya Univeristy )

Research Areas

  • Nanotechnology/Materials / Nanometer-scale chemistry  / Structural Materials Science

  • Nanotechnology/Materials / Metallic material properties

  • Nanotechnology/Materials / Crystal engineering

  • Nanotechnology/Materials / Applied physical properties

  • Nanotechnology/Materials / Nanostructural physics

  • Nanotechnology/Materials / Nanometer-scale chemistry

▼display all

Research Interests

  • 電子密度解析

  • 集積型金属錯体

  • 金属間化合物

  • 粉末回折

  • 放射光

  • Porous Coordination Polymer

  • マキシマムエントロピー法

  • ガス吸着

  • Synchrotron Radiation

  • Powder Diffraction

  • Maximum Entropy Method

  • Intermetallic Compound

  • Gas Adsorption

  • Charge Density

Research subject summary

  • 多孔性配位高分子およびそのガス吸着構造解析

  • 放射光粉末回折法による精密電子密度解析

Research Career

  • Accurate Crystal Structure Analysis

    Structure Determination, Powder Diffraction, Synchrotron Radiation, Gas Adsorption 

Professional Memberships

  • 錯体化学会

    2019.07 - Now   Domestic

  • 日本セラミックス協会

    2019.07 - Now   Domestic

  • 日本放射光学会

    2000.10 - Now   Domestic

  • 日本金属学会

    1994.12 - Now   Domestic

  • 日本物理教育学会

    1994.07 - Now   Domestic

  • 日本結晶学会

    1992.05 - Now   Domestic

  • 日本物理学会

    1991.08 - Now   Domestic

  • Crystallographic Society of Japan

  • 日本金属学会

  • 日本結晶学会

  • 日本物理学会

  • 日本放射光学会

  • The Japan Institute of Metals

  • Physical Society of Japan

  • Japanese Society for Synchrotron Radiation Reserch

▼display all

Awards

  • 平成28年度日本結晶学会賞 学術賞

    2016.11   日本結晶学会  

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    Country：Japan

  • 平成23年度文部科学大臣表彰 科学技術賞 理解増進部門

    2011.04   文部科学省  

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    Country：Japan

Job Career (off-campus)

  • Osaka prefecture University   Graduate School of Science

    2013.04 - Now

Papers

  • On the Structural and Vibrational Properties of Solid Endohedral Metallofullerene Li@C<inf>60</inf>

    Vrankić M.

    Inorganics   12 ( 4 )   2024.04

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  • RuIn Solid-Solution Alloy Nanoparticles with Enhanced Hydrogen Evolution Reaction Activity

    Zhou X.

    ACS Materials Letters   6 ( 2 )   353 - 359   2024.02

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  • Denary High-Entropy Oxide Nanoparticles Synthesized by a Continuous Supercritical Hydrothermal Flow Process.

    Shota Hanabata, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Yoshihide Nishida, Masaaki Haneda, Hiroshi Kitagawa

    Journal of the American Chemical Society   146 ( 1 )   181 - 186   2024.01（ ISSN:00027863 ）

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    Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

    High-entropy oxide nanoparticles (HEO NPs) have been intensively studied because of their attractive properties, such as high stability and enhanced catalytic activity. In this work, for the first time, denary HEO NPs were successfully synthesized using a continuous supercritical hydrothermal flow process without calcination. Interestingly, this process allows the formation of HEO NPs on the order of seconds at a relatively lower temperature. The synthesized HEO NPs contained 10 metal elements, La, Ca, Sr, Ba, Fe, Mn, Co, Ru, Pd, and Ir, and had a perovskite-type structure. Atomic-resolution high-angle annular dark-field scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy measurements revealed homogeneous dispersion of the 10 metal elements. The obtained HEO NPs also exhibited a higher catalytic activity for the CO oxidation reaction than that of the LaFeO3 NPs.

    DOI： 10.1021/jacs.3c07351

    PubMed

  • Denary High-Entropy Oxide Nanoparticles Synthesized by a Continuous Supercritical Hydrothermal Flow Process

    Hanabata Shota, Kusada Kohei, Yamamoto Tomokazu, Toriyama Takaaki, Matsumura Syo, Kawaguchi Shogo, Kubota Yoshiki, Nishida Yoshihide, Haneda Masaaki, Kitagawa Hiroshi

    Journal of the American Chemical Society   146 ( 1 )   181 - 186   2024.01（ ISSN:00027863 ） （ eISSN:15205126 ）

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    High-entropy oxide nanoparticles (HEO NPs) have been intensively studied because of their attractive properties, such as high stability and enhanced catalytic activity. In this work, for the first time, denary HEO NPs were successfully synthesized using a continuous supercritical hydrothermal flow process without calcination. Interestingly, this process allows the formation of HEO NPs on the order of seconds at a relatively lower temperature. The synthesized HEO NPs contained 10 metal elements, La, Ca, Sr, Ba, Fe, Mn, Co, Ru, Pd, and Ir, and had a perovskite-type structure. Atomic-resolution high-angle annular dark-field scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy measurements revealed homogeneous dispersion of the 10 metal elements. The obtained HEO NPs also exhibited a higher catalytic activity for the CO oxidation reaction than that of the LaFeO₃ NPs.

  • First synthesis of RuSn solid-solution alloy nanoparticles and their enhanced hydrogen evolution reaction activity

    Xin Zhou, Megumi Mukoyoshi, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Yasukazu Murakami, Shogo Kawaguchi, Yoshiki Kubota, Okkyun Seo, Osami Sakata, Toshiaki Ina, Hiroshi Kitagawa

    Chemical Science   15 ( 20 )   7560 - 7567   2024（ ISSN:2041-6520 ） （ eISSN:2041-6539 ）

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    Publishing type：Research paper (scientific journal)  

    Solid-solution alloys based on platinum group metals and p-block metals have attracted much attention due to their promising potential as materials with a continuously fine-tunable electronic structure. Here, we report on the first synthesis of novel solid-solution RuSn alloy nanoparticles (NPs) by electrochemical cyclic voltammetry sweeping of RuSn@SnOx NPs. High-angle annular dark-field scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy maps confirmed the random and homogeneous distribution of Ru and Sn elements in the alloy NPs. Compared with monometallic Ru NPs, the RuSn alloy NPs showed improved hydrogen evolution reaction (HER) performance. The overpotentials of Ru0.94Sn0.06 NPs/C and Ru0.87Sn0.13 NPs/C to achieve a current density of 10 mA cm−2 were 43.41 and 33.19 mV, respectively, which are lower than those of monometallic Ru NPs/C (53.53 mV) and commercial Pt NPs/C (55.77 mV). The valence-band structures of the NPs investigated by hard X-ray photoelectron spectroscopy demonstrated that the d-band centre of RuSn NPs shifted downward compared with that of Ru NPs. X-ray photoelectron spectroscopy and X-ray absorption near-edge structure analyses indicated that in the RuSn alloy NPs, charge transfer occurs from Sn to Ru, which was considered to result in a downward shift of the d-band centre in RuSn NPs and to regulate the adsorption energy of intermediate Hads effectively, and thus enable the RuSn solid-solution alloy NPs to exhibit excellent HER catalytic properties.

    DOI： 10.1039/d3sc06786f

    PubMed

  • Mechanochemical Synthesis, Structure, and Ionic Conductivity of K<inf>2</inf>NaYCl<inf>6</inf> and KNa<inf>2</inf>YCl<inf>6</inf>

    Ben Yahia H.

    Journal of Physical Chemistry C   2024（ ISSN:19327447 ）

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  • Soft corrugated channel with synergistic exclusive discrimination gating for CO<inf>2</inf> recognition in gas mixture

    Gu Y.

    Nature Communications   14 ( 1 )   4245   2023.12

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  • Molybdenum-Ruthenium-Carbon Solid-Solution Alloy Nanoparticles: Can They Be Pseudo-Technetium Carbide?

    Okazoe S.

    Journal of the American Chemical Society   145 ( 44 )   24005 - 24011   2023.11（ ISSN:00027863 ）

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  • Crossover Sorption of C<inf>2</inf>H<inf>2</inf>/CO<inf>2</inf> and C<inf>2</inf>H<inf>6</inf>/C<inf>2</inf>H<inf>4</inf> in Soft Porous Coordination Networks

    Shivanna M.

    Angewandte Chemie - International Edition   62 ( 39 )   e202308438   2023.09（ ISSN:14337851 ）

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  • Integrated Soft Porosity and Electrical Properties of Conductive-on-Insulating Metal-Organic Framework Nanocrystals

    Yao M.S.

    Angewandte Chemie - International Edition   62 ( 35 )   e202303903   2023.08（ ISSN:14337851 ）

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  • CuxRu1-x catalysts for carbon neutralization with CH4 or CO production Reviewed

    B. Huang, Y. Liu, H. Kobayashi, Z. Tan, T. Yamamoto, T. Toriyama, S. Matsumura, S. Kawaguchi, Y. Kubota, H. Zheng, and H. Kitagawa

    3   100705 - 100705   2023.07

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    Kind of work：Joint Work  

  • Continuous-Flow Chemical Synthesis for Sub-2 nm Ultra-Multielement Alloy Nanoparticles Consisting of Group IV to XV Elements

    Hiroki Minamihara, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Yasukazu Murakami, Syo Matsumura, Loku Singgappulige Rosantha Kumara, Osami Sakata, Shogo Kawaguchi, Yoshiki Kubota, Okkyun Seo, Satoshi Yasuno, Hiroshi Kitagawa

    Journal of the American Chemical Society   145 ( 31 )   17136 - 17142   2023.07（ ISSN:0002-7863 ） （ eISSN:1520-5126 ）

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jacs.3c03713

    PubMed

  • Soft corrugated channel with synergistic exclusive discrimination gating for CO₂ recognition in gas mixture

    Gu Yifan, Zheng Jia-Jia, Otake Ken-ichi, Sakaki Shigeyoshi, Ashitani Hirotaka, Kubota Yoshiki, Kawaguchi Shogo, Yao Ming-Shui, Wang Ping, Wang Ying, Li Fengting, Kitagawa Susumu

    Nature Communications   14   2023.07（ eISSN:20411723 ）

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    Developing artificial porous systems with high molecular recognition performance is critical but very challenging to achieve selective uptake of a particular component from a mixture of many similar species, regardless of the size and affinity of these competing species. A porous platform that integrates multiple recognition mechanisms working cooperatively for highly efficient guest identification is desired. Here, we designed a flexible porous coordination polymer (PCP) and realised a corrugated channel system that cooperatively responds to only target gas molecules by taking advantage of its stereochemical shape, location of binding sites, and structural softness. The binding sites and structural deformation act synergistically, exhibiting exclusive discrimination gating (EDG) effect for selective gate-opening adsorption of CO₂ over nine similar gas molecules, including N₂, CH₄, CO, O₂, H₂, Ar, C₂H₆, and even higher-affinity gases such as C₂H₂ and C₂H4. Combining in-situ crystallographic experiments with theoretical studies, it is clear that this unparalleled ability to decipher the CO₂ molecule is achieved through the coordination of framework dynamics, guest diffusion, and interaction energetics. Furthermore, the gas co-adsorption and breakthrough separation performance render the obtained PCP an efficient adsorbent for CO₂ capture from various gas mixtures.

  • B2-structured indium-platinum group metal high-entropy intermetallic nanoparticles

    Nakamura M.

    Chemical Communications   59 ( 62 )   9485 - 9488   2023.07（ ISSN:13597345 ）

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  • Structure determination and magnetic studies of triazole chelated Co(II) coordination polymers

    Chen B.H.

    Journal of the Chinese Chemical Society   70 ( 5 )   1187 - 1199   2023.05（ ISSN:00094536 ）

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  • Selective sorption of oxygen and nitrous oxide by an electron donor-incorporated flexible coordination network Reviewed

    Shivanna M, Zheng JJ, Ray KG, Lto S, Ashitani H, Kubota Y, Kawaguchi S, Stavila V, Yao MS, Fujikawa T, Otake KI, Kitagawa S

    Communications Chemistry   6 ( 1 )   62   2023.04（ eISSN:2399-3669 ）

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    Publishing type：Research paper (scientific journal)  

    Abstract

    Incorporating strong electron donor functionality into flexible coordination networks is intriguing for sorption applications due to a built-in mechanism for electron-withdrawing guests. Here we report a 2D flexible porous coordination network, [Ni<sub>2</sub>(4,4′-bipyridine)(VTTF)<sub>2</sub>]n(1) (where H<sub>2</sub>VTTF = 2,2′-[1,2-bis(4-benzoic acid)-1,2ethanediylidene]bis-1,3-benzodithiole), which exhibits large structural deformation from the as-synthesized or open phase (1α) into the closed phase (1β) after guest removal, as demonstrated by X-ray and electron diffraction. Interestingly, upon exposure to electron-withdrawing species, 1β reversibly undergoes guest accommodation transitions; 1α⊃O<sub>2</sub> (90 K) and 1α⊃N<sub>2</sub>O (185 K). Moreover, the 1β phase showed exclusive O<sub>2</sub> sorption over other gases (N<sub>2</sub>, Ar, and CO) at 120 K. The phase transformations between the 1α and 1β phases under these gases were carefully investigated by in-situ X-ray diffraction, in-situ spectroscopic studies, and DFT calculations, validating that the unusual sorption was attributed to the combination of flexible frameworks and VTTF (electron-donor) that induces strong interactions with electron-withdrawing species.

    DOI： 10.1038/s42004-023-00853-1

    PubMed

    Other URL： https://www.nature.com/articles/s42004-023-00853-1

  • Nanoscale coexistence of polar-nonpolar domains underlying oxygen storage properties in Ho(Mn, Ti) O3+δ

    Nakajima H.

    Physical Review Research   5 ( 2 )   2023.04（ ISSN:26431564 ）

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  • Time-resolved in-situ X-ray diffraction and crystal structure analysis of porous coordination polymer CPL-1 in CO2 adsorption Reviewed

    H. Ashitani, S. Kawaguchi, H. Furukawa, H. Ishibashi, K. Otake, S. Kitagawa, and Y. Kubota

    Journal of Solid State Chemistry   319   123796 - 123796   2023.03（ ISSN:00224596 ）

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.jssc.2022.123796

  • Fine Pore-Structure Engineering by Ligand Conformational Control of Naphthalene Diimide-Based Semiconducting Porous Coordination Polymers for Efficient Chemiresistive Gas Sensing Reviewed

    Xue Z.

    Angewandte Chemie - International Edition   62 ( 2 )   e202215234   2023.01（ ISSN:14337851 ）

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/anie.202215234

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  • Irreversible Structural Phase Transition in [(9-triptycylammonium) ([18]crown-6)][Ni(dmit)<inf>2</inf>]: Origin and Effects on Electrical and Magnetic Properties

    Manabe J.

    European Journal of Inorganic Chemistry   2023（ ISSN:14341948 ）

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  • Growth mechanisms and anisotropic softness-dependent conductivity of orientation-controllable metal-organic framework nanofilms

    Yao M.S.

    Proceedings of the National Academy of Sciences of the United States of America   120 ( 40 )   e2305125120   2023（ ISSN:00278424 ）

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  • Electron injection into superconducting trivalent fullerides close to the Mott transition boundary

    Matsui K.

    Modern Physics Letters B   2023（ ISSN:02179849 ）

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  • Phase diagram and crystal structure of Ti-doped HoMnO3 by high-resolution synchrotron powder diffraction Reviewed

    Hiroki Ishibashi, Fernando Cubillas, Kento Uchihashi, Hirofumi Tsukasaki, Shogo Kawaguchi, Toshiaki Ina, Francisco Brown, Noboru Kimizuka, Shigeo Mori, Yoshiki Kubota

    Journal of Solid State Chemistry   312   123273 - 123273   2022.08（ ISSN:0022-4596 ）

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.jssc.2022.123273

  • Continuous-Flow Reactor Synthesis for Homogeneous 1 nm-Sized Extremely Small High-Entropy Alloy Nanoparticles. Reviewed

    Hiroki Minamihara, Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Loku Singgapulige Rosantha Kumara, Koji Ohara, Osami Sakata, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Journal of the American Chemical Society   144 ( 26 )   11525 - 11529   2022.07（ ISSN:0002-7863 ） （ eISSN:1520-5126 ）

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    Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

    High-entropy alloy nanoparticles (HEA NPs) emerged as catalysts with superior performances that are not shown in monometallic catalysts. Although many kinds of synthesis techniques of HEA NPs have been developed recently, synthesizing HEA NPs with ultrasmall particle size and narrow size distribution remains challenging because most of the reported synthesis methods require high temperatures that accelerate particle growth. This work provides a new methodology for the fabrication of ultrasmall and homogeneous HEA NPs using a continuous-flow reactor with a liquid-phase reduction method. We successfully synthesized ultrasmall IrPdPtRhRu HEA NPs (1.32 ± 0.41 nm), theoretically each consisting of approximately 50 atoms. This average size is the smallest ever reported for HEA NPs. All five elements are homogeneously mixed at the atomic level in each particle. The obtained HEA NPs marked a significantly high hydrogen evolution reaction (HER) activity with a very small 6 mV overpotential at 10 mA/cm-2 in acid, which is one-third of the overpotential of commercial Pt/C. In addition, although mass production of HEA NPs is still difficult, this flow synthesis can provide high productivity with high reproducibility, which is more energy efficient and suitable for mass production. Therefore, this study reports the 1 nm-sized HEA NPs with remarkably high HER activity and establishes a platform for the production of ultrasmall and homogeneous HEA NPs.

    DOI： 10.1021/jacs.2c02755

    PubMed

  • Systematic Tuning of the Magnetic Properties in Mixed-Metal MOF-74. Reviewed

    Megumi Mukoyoshi, Mitsuhiko Maesato, Shogo Kawaguchi, Yoshiki Kubota, Keigo Cho, Yasutaka Kitagawa, Hiroshi Kitagawa

    Inorganic chemistry   61 ( 19 )   7226 - 7230   2022.05（ ISSN:00201669 ）

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    Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

    Recently, mixed-metal metal-organic frameworks (MOFs) have been attracting much attention in various fields. In this study, we have systematically investigated the magnetic properties of CoxNi1-x-MOF-74 [Co2xNi2(1-x)(dhtp), where H4dhtp = 2,5-dihydroxyterephthalic acid] with two different kinds of metals (Co and Ni) across the composition range 0 ≤ x ≤ 1. Bimetallic CoxNi1-x-MOF-74 (x = 0.752, 0.458, and 0.233) were successfully synthesized and confirmed to have homogeneous metal distributions. Weak ferromagnetic (canted antiferromagnetic) behavior was exhibited, while homometallic Co-MOF-74 and Ni-MOF-74 are antiferromagnetic. We also investigated the effects of C2H4 sorption on the magnetic properties and found that C2H4-adsorbed Co0.5Ni0.5-MOF-74 exhibited a change in the interchain magnetic interaction.

    DOI： 10.1021/acs.inorgchem.2c00646

    PubMed

  • Crystal Structure Control of Binary and Ternary Solid-Solution Alloy Nanoparticles with a Face-Centered Cubic or Hexagonal Close-Packed Phase Reviewed

    Quan Zhang, Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Journal of the American Chemical Society   144 ( 9 )   4224 - 4232   2022.03（ ISSN:0002-7863 ） （ eISSN:1520-5126 ）

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    Publishing type：Research paper (scientific journal)  

    The crystal structure significantly affects the physical and chemical properties of solids. However, the crystal structure-dependent properties of alloys are rarely studied because controlling the crystal structure of an alloy at the same composition is extremely difficult. Here, for the first time, we successfully demonstrate the synthesis of binary Ru-Pt (Ru/Pt = 7:3) and Ru-Ir (Ru/Ir = 7:3) and ternary Ru-Ir-Pt (Ru/Ir/Pt = 7:1.5:1.5) solid-solution alloy nanoparticles (NPs) with well-controlled hexagonal close-packed (hcp) and face-centered cubic (fcc) phases, through the chemical reduction method. The crystal structure control is realized by precisely tunning the reduction speeds of the metal precursors. The effect of the crystal structure on the catalytic performance of solid-solution alloy NPs is systematically investigated. Impressively, all the hcp alloy NPs show superior electrocatalytic activities for the hydrogen evolution reaction in alkaline solution compared with the fcc alloy NPs. In particular, hcp-RuIrPt exhibits extremely high intrinsic (mass) activity, which is 3.1 (3.2) and 6.7 (6.9) times enhanced compared to that of fcc-RuIrPt and commercial Pt/C.

    DOI： 10.1021/jacs.2c00583

    PubMed

  • Phase Control of Solid-Solution Nanoparticles beyond the Phase Diagram for Enhanced Catalytic Properties Reviewed

    Dongshuang Wu, Kohei Kusada, Susan Meñez Aspera, Hiroshi Nakanishi, Yanna Chen, Okkyun Seo, Chulho Song, Jaemyung Kim, Satoshi Hiroi, Osami Sakata, Tomokazu Yamamoto, Syo Matsumura, Yusuke Nanba, Michihisa Koyama, Naoki Ogiwara, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    ACS Materials Au   2 ( 2 )   110 - 116   2022.03（ ISSN:2694-2461 ） （ eISSN:2694-2461 ）

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsmaterialsau.1c00048

  • Noble-Metal High-Entropy-Alloy Nanoparticles: Atomic-Level Insight into the Electronic Structure Reviewed

    Dongshuang Wu, Kohei Kusada, Yusuke Nanba, Michihisa Koyama, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Okkyun Seo, Ibrahima Gueye, Jaemyung Kim, Loku Singgapulige Rosantha Kumara, Osami Sakata, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Journal of the American Chemical Society   144 ( 8 )   3365 - 3369   2022.03（ ISSN:0002-7863 ） （ eISSN:1520-5126 ）

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    Publishing type：Research paper (scientific journal)  

    The compositional space of high-entropy-alloy nanoparticles (HEA NPs) significantly expands the diversity of the materials library. Every atom in HEA NPs has a different elemental coordination environment, which requires knowledge of the local electronic structure at an atomic level. However, such structure has not been disclosed experimentally or theoretically. We synthesized HEA NPs composed of all eight noble-metal-group elements (NM-HEA) for the first time. Their electronic structure was revealed by hard X-ray photoelectron spectroscopy and density function theory calculations with NP models. The NM-HEA NPs have a lower degeneracy in energy level compared with the monometallic NPs, which is a common feature of HEA NPs. The local density of states (LDOS) of every surface atom was first revealed. Some atoms of the same constituent element in HEA NPs have different LDOS profiles, whereas atoms of other elements have similar LDOS profiles. In other words, one atom in HEA loses its elemental identity and it may be possible to create an ideal LDOS by adjusting the neighboring atoms. The tendency of the electronic structure change was shown by supervised learning. The NM-HEA NPs showed 10.8-times higher intrinsic activity for hydrogen evolution reaction than commercial Pt/C, which is one of the best catalysts.

    DOI： 10.1021/jacs.1c13616

    PubMed

  • Compositional dependence of structures and hydrogen evolution reaction activity of platinum-group-metal quinary RuRhPdIrPt alloy nanoparticles Reviewed

    Yuto Maruta, Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Okkyun Seo, Satoshi Yasuno, Shogo Kawaguchi, Osami Sakata, Yoshiki Kubota, Hiroshi Kitagawa

    Chemical Communications   58 ( 44 )   6421 - 6424   2022（ ISSN:1359-7345 ） （ eISSN:1364-548X ）

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    Publishing type：Research paper (scientific journal)  

    Platinum-group-metal quinary RuRhPdIrPt alloy nanoparticles were synthesised with compositions slightly away from equimolar, and their crystal, electronic structures and catalytic activity for hydrogen evolution reaction were investigated.

    DOI： 10.1039/d2cc01866g

    PubMed

  • Structural phase transitions in cobalt oxyfluoride Co3Sb4O6F4 observed by high-resolution synchrotron and neutron diffraction Reviewed

    163   110568   2021.12

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    Publishing type：Research paper (scientific journal)   Kind of work：Joint Work  

    DOI： 10.1016/j.jpcs.2021.110568

  • Phase Stability and Crystal Structure of an InSb<sub>x</sub>Te<sub>1-x</sub> System

    Kubota Yoshiki, Shimono Seiya, Kawaguchi Shogo, Ohara Koji, Ina Toshiaki, Ishibashi Hiroki, Kifune Kouichi, Matsunaga Toshiyuki

    SPring-8/SACLA Research Report   9 ( 7 )   503 - 507   2021.12（ eISSN:2187-6886 ）

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  • Fabrication of Integrated Copper-Based Nanoparticles/Amorphous Metal–Organic Framework by a Facile Spray-Drying Method: Highly Enhanced CO<inf>2</inf> Hydrogenation Activity for Methanol Synthesis Reviewed

    Yuko Mitsuka, Naoki Ogiwara, Megumi Mukoyoshi, Hiroshi Kitagawa, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Masaaki Haneda, Shogo Kawaguchi, Yoshiki Kubota, Hirokazu Kobayashi

    Angewandte Chemie - International Edition   60 ( 41 )   22283 - 22288   2021.10（ ISSN:1433-7851 ） （ eISSN:1521-3773 ）

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    Publishing type：Research paper (scientific journal)  

    We report on Cu/amUiO-66, a composite made of Cu nanoparticles (NPs) and amorphous [Zr6O4(OH)4(BDC)6] (amUiO-66, BDC=1,4-benzenedicarboxylate), and Cu-ZnO/amUiO-66 made of Cu-ZnO nanocomposites and amUiO-66. Both structures were obtained via a spray-drying method and characterized using high-resolution transmission electron microscopy, energy dispersive spectra, powder X-ray diffraction and extended X-ray absorption fine structure. The catalytic activity of Cu/amUiO-66 for CO2 hydrogenation to methanol was 3-fold that of Cu/crystalline UiO-66. Moreover, Cu-ZnO/amUiO-66 enhanced the methanol production rate by 1.5-fold compared with Cu/amUiO-66 and 2.5-fold compared with γ-Al2O3-supported Cu-ZnO nanocomposites (Cu-ZnO/γ-Al2O3) as the representative hydrogenation catalyst. The high catalytic performance was investigated using in situ Fourier transform IR spectra. This is a first report of a catalyst comprising metal NPs and an amorphous metal–organic framework in a gas-phase reaction.

    DOI： 10.1002/anie.202110585

    PubMed

  • A Comparative study of honeycomb-like 2D π-conjugated metal-organic framework chemiresistors: conductivity and channels Reviewed

    M. Yao, P. Wang, Yi. Gu, T. Koganezawa, H. Ashitani, Y. Kubota, Z. Wang, Z. Fan, K. Otake, and S. Kitagawa

    Dalton Trans. 雑誌   50   13236 - 13245   2021.09

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    Kind of work：Joint Work  

  • Xylene Recognition in Flexible Porous Coordination Polymer by Guest-dependent Structural Transition Reviewed

    13   52144 - 52151   2021.08

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    Publishing type：Research paper (scientific journal)   Kind of work：Joint Work  

    DOI： 10.1021/acsami.1c10061

  • Fabrication of Integrated Cu-Based Nanoparticles/Amorphous Metal–Organic Framework by Facile Spray-Drying Method: Highly Enhanced CO2 Hydrogenation Activity for Methanol Synthesis Reviewed

    Y. Mitsuka, N. Ogiwara, M. Mukoyoshi, H. Kitagawa, T. Yamamoto, T. Toriyama, S. Matsumura, M. Haneda, S. Kawaguchi, Y. Kubota, and H. Kobayashi

    Angew. Chem. Int. Ed. 雑誌   60   22283 - 22288   2021.08

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    Kind of work：Joint Work  

  • Room-temperature high convergence of electronic bands to achieve superior power factor of thermoelectric GeTe-system Reviewed

    T. Oku, H. Funashima, S. Kawaguchi, Y. Kubota, and A. Kosuga

    Mater. Today Phys. 雑誌   20   2021.08

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    Kind of work：Joint Work  

  • Boosting reverse water-gas shift reaction activity of Pt nanoparticles through light doping of W Reviewed

    D. Kobayashi, H. Kobayashi, K. Kusada, T. Yamamoto, T. Toriyama, S. Matsumura, S. Kawaguchi, Y. Kubota, M. Haneda, S. M. Aspera, H. Nakanishi, S. Arai, and H. Kitagawa

    J. Mater. Chem. A 雑誌   9   15613 - 15617   2021.07

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  • Ni@onion-like carbon and Co@amorphous carbon by a thermal decomposition of MOF: A control of carbon structures by metal ion species in MOF Reviewed

    M. Mukoyoshi, H. Kobayashi, K. Kusada, K. Otsubo, M. Maesato, Y. Kubota, T. Yamamoto, S. Matsumura, and H. Kitagawa

    Chem. Commun. 雑誌   57   5897 - 5900   2021.05

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  • Ni@onion-like carbon and Co@amorphous carbon: control of carbon structures by metal ion species in MOFs

    Megumi Mukoyoshi, Hirokazu Kobayashi, Kohei Kusada, Kazuya Otsubo, Mitsuhiko Maesato, Yoshiki Kubota, Tomokazu Yamamoto, Syo Matsumura, Hiroshi Kitagawa

    CHEMICAL COMMUNICATIONS   57 ( 48 )   5897 - 5900   2021.05（ ISSN:1359-7345 ） （ eISSN:1364-548X ）

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    Publishing type：Research paper (scientific journal)  

    We first report the facile synthesis of metal-carbon composites consisting of metal nanoparticles (NPs) and different types of carbon species: onion-like and amorphous carbon, Ni@onion-like carbon and Co@amorphous carbon. By simply changing the metal species in an isostructural metal-organic framework, thermal decompositions of MOF-74 directly afforded different types of metal NPs and carbon composites, which exhibited good electrical conductivity. In particular, the Ni@onion-like carbon, having a well-ordered carbon structure, had high electrical conductivity (sigma = 5.3 omega(-1) cm(-1) at 295 K), explained by a modified model of the Efros-Shklovskii variable range hopping.

    DOI： 10.1039/d1cc02154k

  • Highly Stable and Active Solid-Solution-Alloy Three-Way Catalyst by Utilizing Configurational-Entropy Effect

    Kohei Kusada, Dongshuang Wu, Yusuke Nanba, Michihisa Koyama, Tomokazu Yamamoto, Xuan Quy Tran, Takaaki Toriyama, Syo Matsumura, Ayano Ito, Katsutoshi Sato, Katsutoshi Nagaoka, Okkyun Seo, Chulho Song, Yanna Chen, Natalia Palina, Loku Singgappulige Rosantha Kumara, Satoshi Hiroi, Osami Sakata, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    ADVANCED MATERIALS   33 ( 16 )   2021.04（ ISSN:0935-9648 ） （ eISSN:1521-4095 ）

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    Since 1970, people have been making every endeavor to reduce toxic emissions from automobiles. After the development of a three-way catalyst (TWC) that concurrently converts three harmful gases, carbon monoxide (CO), hydrocarbons (HCs), and nitrogen oxides (NOx), Rh became an essential element in automobile technology because only Rh works efficiently for catalytic NOx reduction. However, due to the sharp price spike in 2007, numerous efforts have been made to replace Rh in TWCs. Nevertheless, Rh remains irreplaceable, and now, the price of Rh is increasing significantly again. Here, it is demonstrated that PdRuM ternary solid-solution alloy nanoparticles (NPs) exhibit highly durable and active TWC performance, which will result in a significant reduction in catalyst cost compared to Rh. This work provides insights into the design of highly durable and efficient functional alloy NPs, guiding how to best take advantage of the configurational entropy in addition to the mixing enthalpy.

    DOI： 10.1002/adma.202005206

  • First Observation of Superconductivity in Molybdenum-Ruthenium-Carbon Alloy Nanoparticles

    Shinya Okazoe, Kohei Kusada, Yukihiro Yoshida, Mitsuhiko Maesato, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    CHEMISTRY LETTERS   50 ( 4 )   596 - 598   2021.04（ ISSN:0366-7022 ） （ eISSN:1348-0715 ）

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    Publishing type：Research paper (scientific journal)  

    We report the synthesis of molybdenum-ruthenium-carbon alloy nanoparticles with molybdenum-rich composition by an annealing treatment following a thermal decomposition. We first found its superconductivity with a transition temperature at around 5 K through the observation of zero resistivity and Meisner effect.

    DOI： 10.1246/cl.200779

  • Efficient overall water splitting in acid with anisotropic metal nanosheets Reviewed

    D. Wu, K. Kusada, S. Yoshioka, T. Yamamoto, T. Tomiyama, S. Matsumura, Y. Chen, O. Seo, J. Kim, C. Song, S. Hiroi, O. Sakata, T. Ina, S. Kawaguchi, Y. Kubota, H. Kobayashi, and H Kitagawa

    Nature Commun. 雑誌   12   2021.02

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  • Efficient overall water splitting in acid with anisotropic metal nanosheets

    Dongshuang Wu, Kohei Kusada, Satoru Yoshioka, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Yanna Chen, Okkyun Seo, Jaemyung Kim, Chulho Song, Satoshi Hiroi, Osami Sakata, Toshiaki Ina, Shogo Kawaguchi, Yoshiki Kubota, Hirokazu Kobayashi, Hiroshi Kitagawa

    NATURE COMMUNICATIONS   12 ( 1 )   2021.02（ ISSN:2041-1723 ） （ eISSN:2041-1723 ）

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    Publishing type：Research paper (scientific journal)  

    Water is the only available fossil-free source of hydrogen. Splitting water electrochemically is among the most used techniques, however, it accounts for only 4% of global hydrogen production. One of the reasons is the high cost and low performance of catalysts promoting the oxygen evolution reaction (OER). Here, we report a highly efficient catalyst in acid, that is, solid-solution RuIr nanosized-coral (RuIr-NC) consisting of 3 nm-thick sheets with only 6at.% Ir. Among OER catalysts, RuIr-NC shows the highest intrinsic activity and stability. A home-made overall water splitting cell using RuIr-NC as both electrodes can reach 10mAcm(geo)(-2) at 1.485V for 120h without noticeable degradation, which outperforms known cells. Operando spectroscopy and atomic-resolution electron microscopy indicate that the high-performance results from the ability of the preferentially exposed {0001} facets to resist the formation of dissolvable metal oxides and to transform ephemeral Ru into a long-lived catalyst. Ru is one of the most active metals for oxygen evolution reaction, but it quickly dissolves in acidic electrolyte particularly in nanosized form. Here, the authors show that coral-like solid-solution RuIr consisting of 3 nm-thick sheets with only 6 at% Ir is a long-lived catalyst with high activity.

    DOI： 10.1038/s41467-021-20956-4

    PubMed

  • Highly Stable and Active Solid-Solution-Alloy Three-Way Catalyst by Utilizing Configurational-Entropy Effect Reviewed

    K. Kusada, D. Wu, Y. Nanba, M. Koyama, T. Yamamoto, X. Q. Tran, T. Toriyama, S. Matsumura, A. Ito, K. Sato, K. Nagaoka, O. Seo, C. Song, Y. Chen, N. Palina, L. S. R. Kumara, S. Hiroi, O. Sakata, S. Kawaguchi, Y. Kubota, and H. Kitagawa

    Adv. Mater. 雑誌   33   2021.01

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  • Correction: On the electronic structure and hydrogen evolution reaction activity of platinum group metal-based high-entropy-alloy nanoparticles

    Dongshuang Wu, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Ibrahima Gueye, Okkyun Seo, Jaemyung Kim, Satoshi Hiroi, Osami Sakata, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Chemical Science   12 ( 20 )   7196 - 7196   2021（ ISSN:2041-6520 ） （ eISSN:2041-6539 ）

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    <p>Correction for ‘On the electronic structure and hydrogen evolution reaction activity of platinum group metal-based high-entropy-alloy nanoparticles’ by Dongshuang Wu <italic>et al.</italic>, <italic>Chem. Sci.</italic>, 2020, <bold>11</bold>, 12731–12736, DOI: 10.1039/D0SC02351E.</p>

    DOI： 10.1039/d1sc90104d

  • Boosting reverse water-gas shift reaction activity of Pt nanoparticles through light doping of W

    Daiya Kobayashi, Hirokazu Kobayashi, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Masaaki Haneda, Susan Meñez Aspera, Hiroshi Nakanishi, Shigebumi Arai, Hiroshi Kitagawa

    Journal of Materials Chemistry A   2021（ ISSN:2050-7488 ） （ eISSN:2050-7496 ）

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    Publishing type：Research paper (scientific journal)  

    <p>We report PtW solid-solution alloy nanoparticles (NPs) as a reverse water-gas shift (RWGS) reaction catalyst for the first time. Atomic-level alloying of Pt and W significantly enhanced the RWGS reaction activity of Pt NPs.</p>

    DOI： 10.1039/d1ta03480d

  • On the electronic structure and hydrogen evolution reaction activity of platinum group metal-based high-entropy-alloy nanoparticles

    Dongshuang Wu, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Ibrahima Gueye, Okkyun Seo, Jaemyung Kim, Satoshi Hiroi, Osami Sakata, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Chemical Science   11 ( 47 )   12731 - 12736   2020.12（ ISSN:2041-6520 ） （ eISSN:2041-6539 ）

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    Publishing type：Research paper (scientific journal)  

    © 2020 The Royal Society of Chemistry. We report the synthesis of high-entropy-alloy (HEA) nanoparticles (NPs) consisting of five platinum group metals (Ru, Rh, Pd, Ir and Pt) through a facile one-pot polyol process. We investigated the electronic structure of HEA NPs using hard X-ray photoelectron spectroscopy, which is the first direct observation of the electronic structure of HEA NPs. Significantly, the HEA NPs possessed a broad valence band spectrum without any obvious peaks. This implies that the HEA NPs have random atomic configurations leading to a variety of local electronic structures. We examined the hydrogen evolution reaction (HER) and observed a remarkably high HER activity on HEA NPs. At an overpotential of 25 mV, the turnover frequencies of HEA NPs were 9.5 and 7.8 times higher than those of a commercial Pt catalyst in 0.05 M H2SO4 and 1.0 M KOH electrolytes, respectively. Moreover, the HEA NPs showed almost no loss during a cycling test and were much more stable than the commercial Pt catalyst. Our findings on HEA NPs may provide a new paradigm for the design of catalysts.

    DOI： 10.1039/d0sc02351e

  • First Observation of Superconductivity in Molybdenum–Ruthenium-Carbon Alloy Nanoparticles Reviewed

    S. Okazoe, K. Kusada, Y. Yoshida, M. Maesato, T. Yamamoto, T. Toriyama, S. Matsumura, S. Kawaguchi, Y. Kubota, and H. Kitagawa

    Chem. Lett. 雑誌   50   596 - 598   2020.12

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    Kind of work：Joint Work  

  • Synthesis of Mo and Ru solid-solution alloy NPs and their hydrogen evolution reaction activity

    Shinya Okazoe, Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Chemical Communications   56 ( 92 )   14475 - 14478   2020.11（ ISSN:1359-7345 ） （ eISSN:1364-548X ）

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    © 2020 The Royal Society of Chemistry. We report the synthesis of MoRu solid-solution alloy nanoparticles using carbonyl complexes as a precursor through thermal decomposition. Alloying Ru with an early transition metal, Mo, leads to an electronic structure change, resulting in an enhancement of the catalytic activity for the hydrogen evolution reaction, which overtook that of the Pt catalyst.

    DOI： 10.1039/d0cc05958g

    PubMed

  • Coreduction methodology for immiscible alloys of CuRu solid-solution nanoparticles with high thermal stability and versatile exhaust purification ability

    Bo Huang, Hirokazu Kobayashi, Tomokazu Yamamoto, Syo Matsumura, Yoshihide Nishida, Katsutoshi Sato, Katsutoshi Nagaoka, Masaaki Haneda, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Chemical Science   11 ( 42 )   11413 - 11418   2020.11（ ISSN:2041-6520 ） （ eISSN:2041-6539 ）

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    Publishing type：Research paper (scientific journal)  

    © The Royal Society of Chemistry. This study provides a coreduction methodology for solid solution formation in immiscible systems, with an example of a whole-region immiscible Cu-Ru system. Although the binary Cu-Ru alloy system is very unstable in the bulk state, the atomic-level well-mixed CuRu solid solution nanoparticles were found to have high thermal stability up to at least 773 K in a vacuum. The exhaust purification activity of the CuRu solid solution was comparable to that of face-centred cubic Ru nanoparticles. According to in situ infrared measurements, stronger NO adsorption and higher intrinsic reactivity of the Ru site on the CuRu surface than that of a pure Ru surface were found, affected by atomic-level Cu substitution. Furthermore, CuRu solid solution was a versatile catalyst for purification of all exhaust gases at a stoichiometric oxygen concentration. This journal is

    DOI： 10.1039/d0sc03373a

  • Magnetizing lead-free halide double perovskites

    Weihua Ning, Jinke Bao, Yuttapoom Puttisong, Fabrizo Moro, Libor Kobera, Seiya Shimono, Linqin Wang, Fuxiang Ji, Maria Cuartero, Shogo Kawaguchi, Sabina Abbrent, Hiroki Ishibashi, Roland de Marco, Irina A. Bouianova, Gaston A. Crespo, Yoshiki Kubota, Jiri Brus, Duck Young Chung, Licheng Sun, Weimin M. Chen, Mercouri G. Kanatzidis, Feng Gao

    Science Advances   6 ( 45 )   2020.11（ eISSN:2375-2548 ）

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    Publishing type：Research paper (scientific journal)  

    Spintronics holds great potential for next-generation high-speed and low-power consumption information technology. Recently, lead halide perovskites (LHPs), which have gained great success in optoelectronics, also show interesting magnetic properties. However, the spin-related properties in LHPs originate from the spin-orbit coupling of Pb, limiting further development of these materials in spintronics. Here, we demonstrate a new generation of halide perovskites, by alloying magnetic elements into optoelectronic double perovskites, which provide rich chemical and structural diversities to host different magnetic elements. In our iron-alloyed double perovskite, Cs Ag(Bi:Fe)Br , Fe replaces Bi and forms FeBr clusters that homogenously distribute throughout the double perovskite crystals. We observe a strong temperature-dependent magnetic response at temperatures below 30 K, which is tentatively attributed to a weak ferromagnetic or antiferromagnetic response from localized regions. We anticipate that this work will stimulate future efforts in exploring this simple yet efficient approach to develop new spintronic materials based on lead-free double perovskites. 2 6 6 3+ 3+

    DOI： 10.1126/SCIADV.ABB5381

    PubMed

  • Magnetizing Lead-Free Halide Double Perovskites Reviewed

    W. Ning, J. Bao, Y. Puttisong, F. Moro, L. Kobera, S. Shimono, L. Wang, F. Ji, M. Cuartero, S. Kawaguchi, S. Abbrent, H. Ishibashi, R. De Marco, I. A. Bouianova, G. A. Crespo, Y. Kubota, J. Brus, D. Y. Chung, L. Sun, W. M. Chen, M. Kanatzidis, and F. Gao

    Science Adv. 雑誌   6   2020.11

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  • Synthesis of Mo and Ru solid-solution alloy NPs and their hydrogen evolution reaction activity Reviewed

    Synthesis of Mo and Ru solid-solution alloy NPs and their hydrogen evolution reaction activity

    Chem. Commun. 雑誌   56   14475 - 14478   2020.11

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    Kind of work：Joint Work  

  • Significant Enhancement of Hydrogen Evolution Reaction Activity by Negatively Charged Pt through Light Doping of W

    Daiya Kobayashi, Hirokazu Kobayashi, Dongshuang Wu, Shinya Okazoe, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Susan Meñez Aspera, Hiroshi Nakanishi, Shigebumi Arai, Hiroshi Kitagawa

    Journal of the American Chemical Society   142 ( 41 )   17250 - 17254   2020.10（ ISSN:0002-7863 ） （ eISSN:1520-5126 ）

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    DOI： 10.1021/jacs.0c07143

  • Significant Enhancement of Hydrogen Evolution Reaction Activity by Negatively Charged Pt through Light Doping of W Reviewed

    D. Kobayashi, H. Kobayashi, D. Wu, S. Okazoe, K. Kusada, T. Yamamoto, T. Toriyama, S. Matsumura, S. Kawaguchi, Y. Kubota, S. Aspera, H. Nakanishi, S. Arai, and Hiroshi Kitagawa

    J. Am. Chem. Soc. 雑誌   142   17250 - 17254   2020.09

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  • Gas-Dependent Reversible Structural and Magnetic Transformation between Two Ladder Compounds Reviewed

    J. Manabe, K. Nishida, X. Zhang, Y. Nakano, M. Fujibayashi, G. Cosquer, K. Inoue, S. Shimono, H. Ishibashi, Y. Kubota, M. Shiga, R. Tsunashima, Y. Tatewaki, and S. Nishihara

    Crystals 雑誌   10   2020.09

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  • Coreduction methodology for immiscible alloy of CuRu solid-solution nanoparticles with high thermal stability and versatile exhaust purification ability Reviewed

    B. Huang, H. Kobayashi, T. Yamamoto, S. Matsumura, Y. Nishida, K. Sato, K. Nagaoka, M. Haneda, S. Kawaguchi, Y. Kubota, and H. Kitagawa

    Chem. Sci. 雑誌   11   11413 - 11418   2020.09

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  • Platinum-Group-Metal High-Entropy-Alloy Nanoparticles

    Dongshuang Wu, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Journal of the American Chemical Society   142 ( 32 )   13833 - 13838   2020.08（ ISSN:0002-7863 ） （ eISSN:1520-5126 ）

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    Publishing type：Research paper (scientific journal)  

    The platinum-group metals (PGMs) are six neighboring elements in the periodic table of the elements. Each PGM can efficiently promote unique reactions, and therefore, alloying PGMs would create ideal catalysts for complex or multistep reactions that involve several reactants and intermediates. Thus, high-entropy-alloy (HEA) nanoparticles (NPs) of all six PGMs (denoted as PGM-HEA) having a great variety of adsorption sites on their surfaces could be ideal candidates to catalyze complex reactions. Here, we report for the first time PGM-HEA and demonstrate that PGM-HEA efficiently promotes the ethanol oxidation reaction (EOR) with complex 12-electron/12-proton transfer processes. PGM-HEA shows 2.5 (3.2), 6.1 (9.7), and 12.8 (3.4) times higher activity than the commercial Pd/C, Pd black and Pt/C catalysts in terms of intrinsic (mass) activity, respectively. Remarkably, it records more than 1.5 times higher mass activity than the most active catalyst to date. Our findings pave the way for promoting complex or multistep reactions that are seldom realized by mono- or bimetallic catalysts.

    DOI： 10.1021/jacs.0c04807

    PubMed

  • On the electronic structure and hydrogen evolution reaction activity of platinum group metal-based high-entropy-alloy nanoparticles Reviewed

    D. Wu, K. Kusada, T. Yamamoto, T. Toriyama, S. Matsumura, I. Gueye, O. Seo, J. Kim, S. Hiroi, O. Sakata, S. Kawaguchi, Y. Kubota, H. Kitagawa

    Chem. Sci. 雑誌   11   12731 - 12736   2020.08

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  • Ge2Sb2Te5バルク体の結晶構造と熱電特性に与えるBi置換の影響 Reviewed

    籠本祐基，山田幾也，久保田佳基，小菅厚子

    日本熱電学会誌 雑誌   17   7 - 13   2020.07

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  • Platinum-group-metal High-entropy-alloy Nanoparticles Reviewed

    D. Wu, K. Kusada, T. Yamamoto, T. Toriyama, S. Matsumura, S. Kawaguchi, Y. Kubota, H. Kitagawa

    J. Am. Chem. Soc. 雑誌   142   13833 - 13838   2020.07

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    Kind of work：Joint Work  

  • Structural Phase Transitions of Spinel Compounds by High-Resolution Powder Diffraction

    Seiya SHIMONO, Hiroki ISHIBASHI, Yoshiki KUBOTA, Shogo KAWAGUCHI

    Nihon Kessho Gakkaishi   62 ( 2 )   112 - 117   2020.05（ ISSN:0369-4585 ） （ eISSN:1884-5576 ）

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.5940/jcrsj.62.112

  • Fast continuous measurement of synchrotron powder diffraction synchronized with controlling gas and vapour pressures at beamline BL02B2 of SPring-8 Reviewed

    S. Kawaguchi, M. Takemoto, H. Tanaka, S. Hiraide, K. Sugimoto, and Y. Kubota

    J. Synchrotron Rad. 雑誌   27   616 - 624   2020.05

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  • Stabilization of orthorhombic distortions in Cu-doped and Co-doped ferrimagnetic Mn3 O4 Reviewed

    Kee Hwan Lee, In Yong Hwang, Jae Ho Chung, Hiroki Ishibashi, Yoshiki Kubota, Shogo Kawaguchi, Sanghyun Lee, Shuki Torii, Masato Hagihala, Takahashi Kamiyama

    Physical Review B   101 ( 8 )   2020.02（ ISSN:2469-9950 ） （ eISSN:2469-9969 ）

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    Publishing type：Research paper (scientific journal)  

    © 2020 American Physical Society. Using synchrotron X-ray diffraction, we investigate how the tetragonal-to-orthorhombic phase transition in the ferrimagnetic (c>a) spinel Mn3O4 is driven by the t2 orbital degeneracy of Cu2+(3d9) ions doped in its tetrahderal sites. At high temperatures where the orthorhombic phase initially appears, we observe that the local elongations of Cu-doped tetrahedra cause the unit cells to contract along the same direction. The signs of the local and global lattice strains finally agree with each other when the orthorhombic phase transition is completed below TN=42.5 K. Using neutron diffraction, we report that Co2+(3d7) doping also stabilizes the orthorhombic phase but without enhancing the associated lattice strains. These results are consistent with the scenario that the orthorhombic instability of the undoped Mn3O4 is driven by the spin-lattice coupling.

    DOI： 10.1103/PhysRevB.101.085126

  • Stabilization of orthorhombic distortions in Cu-doped and Co-doped ferrimagnetic Mn3O4 Reviewed

    K. H. Lee, I. Y. Hwang, J. Chung, H. Ishibashi, Y. Kubota, S. Kawaguchi, S. Lee, S. Torii, M. Hagihala, and T. Kamiyama

    Phys. Rev. B 雑誌   101   2020.02

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  • Rational Synthesis for a Noble Metal Carbide

    Takuo Wakisaka, Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Hiroshi Akiba, Osamu Yamamuro, Kazutaka Ikeda, Toshiya Otomo, Natalia Palina, Yanna Chen, Loku S. R. Kumara, Chulho Song, Osami Sakata, Wei Xie, Michihisa Koyama, Yoshiki Kubota, Shogo Kawaguchi, Ryan L. Arevalo, Susan M. Aspera, Elvis F. Arguelles, Hiroshi Nakanishi, Hiroshi Kitagawa

    Journal of the American Chemical Society   142 ( 3 )   1247 - 1253   2020.01（ ISSN:0002-7863 ） （ eISSN:1520-5126 ）

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jacs.9b09219

  • Discovery of face-centred cubic Os nanoparticles

    Takuo Wakisaka, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Gueye Ibrahima, Okkyun Seo, Jaemyung Kim, Satoshi Hiroi, Osami Sakata, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Chemical Communications   56 ( 3 )   372 - 374   2020（ ISSN:1359-7345 ） （ eISSN:1364-548X ）

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    Publishing type：Research paper (scientific journal)  

    This journal is © The Royal Society of Chemistry. We succeeded in controlling the crystal structure of osmium (Os) nanoparticles (NPs). Although Os adopts only a hexagonal close-packed (hcp) structure in the bulk state, a face-centred cubic (fcc) Os was synthesized by a chemical reduction method using an Os acetylacetonate complex as a precursor.

    DOI： 10.1039/c9cc09192k

    PubMed

  • Strain-induced ε-martensitic transformation and hydrogen embrittlement of SUS304 stainless steel Reviewed

    M. Hatano, H. Tsukasaki, A. Kawaguchi, S. Kawaguchi, Y. Kubota, Y. Ishii and S. Mori

    Phil. Mag. Lett. 雑誌   99   404 - 413   2019.12

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  • Discovery of face-centred cubic Os nanoparticles Reviewed

    T. Wakisaka, K. Kusada, T. Yamamoto, T. Toriyama, S. Matsumura, G. IBrahima, P. Seo, J. Kim, S. Hiroi, O. Sakata, S. Kawaguchi, Y. Kubota, and H. Kitagawa

    Chem. Commun. 雑誌   56   372 - 374   2019.11

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  • Rational synthesis method for novel metal carbide Reviewed

    T. Wakisaka, K. Kusada, D. Wu, T. Yamamoto, T. Toriyama, S. Matsumura, H. Akiba, O. Yamamuro, K. Ikeda., T. Otomo, N. Mueller, O. Sakata, X. Wei, M. Koyama, Y. Kubota, S. Kawaguchi, R. L. Arevalo1, S. M. Aspera, E. F. Arguelles, H. Nakanishi, and H. Kitagawa

    J. Am. Chem. Soc. 雑誌   142   1247 - 1253   2019.11

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  • Structure and thermoelectric properties of Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> consolidated and phase-transformed in a short time by spark plasma sintering

    Ono Fumiya, Kawaguchi Shogo, Kubota Yoshiki, Kosuga Atsuko

    JSAP Annual Meetings Extended Abstracts   2019.2   2066 - 2066   2019.09（ eISSN:2436-7613 ）

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  • Magnetic phase diagram and chiral soliton phase of antiferromagnetic chiral magnets [NH4][Mn(HCOO)3] Invited Reviewed

    Yoji Ichiraku, Rikuho Takeda, Seiya Shimono, Masaki Mito, Yoshiki Kubota, Katsuya Inoue, Yusuke Kato

    J. Phys. Soc. Jpn.   88   094710   2019.08

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.7566/JPSJ.88.094710

  • Glassy anomalies in the lattice heat capacity of a crystalline solid caused by ferroelectric fluctuation Reviewed

    Y. Ishii, Y. Ouchi, S. Kawaguchi, H. Ishibashi, Y. Kubota, S. Mori

    Physical Review Materials   3 ( 8 )   2019.08（ eISSN:2475-9953 ）

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    Publishing type：Research paper (scientific journal)  

    © 2019 American Physical Society. Amorphous solids are known to exhibit excess heat capacity that shows a hump near 10 K and diverges from the Debye T3 law at low temperature below 1 K. Here we report that these glassy features are also observed in an insulating crystalline solid. Substitutional chemical suppression of the structural phase transition temperature (TC) of the ferroelectric oxide Ba1-xSrxAl2O4 results in the disappearance of the TC at x=0.07. For the compositional window of x=0.2-0.5, the lattice heat capacity shows a large hump below 10 K and diverges from the T3 law below approximately 2.5 K. Synchrotron x-ray diffraction experiments on single crystals reveal the short-range correlation in the crystal structure that survives down to low temperature; this short-range correlation is responsible for the observed glasslike features in its lattice heat capacity.

    DOI： 10.1103/PhysRevMaterials.3.084414

  • Magnetic phase diagram and chiral soliton phase of chiral antiferromagnet [NH4][Mn(HCOO)3] Reviewed

    Y. Ichiraku, R. Takeda, S. Shimono, M. Mito, Y. Kubota, K. Inoue, and Y. Kato

    J. Phys. Soc. Jpn. 雑誌   88   2019.08

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  • Boundaries of the X phases in Sb-Te and Bi-Te binary alloy systems Reviewed

    K. Kifune, T. Wakiyama, H. Kanaya, Y. Kubota, N. Yamada, and T. Matsunaga

    Crystals 雑誌   9   2019.08

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  • Glassy anomalies in the lattice heat capacity of a crystalline solid caused by ferroelectric fluctuation Reviewed

    Y. Ishii, Y. Ouchi, S. Kawaguchi, H. Ishibashi, Y. Kubota, and S. Mori

    Phys. Rev. Mater. 雑誌   3   2019.08

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  • Phase transitions with extremely small tetragonal distortion in substitution systems of CoV2O4 by high-angular-resolution synchrotron powder diffraction Reviewed

    Shimono Seiya, Ishibashi Hiroki, Kawaguchi Shogo, Kubota Yoshiki

    JOURNAL OF SOLID STATE CHEMISTRY   273   37 - 44   2019.05（ ISSN:0022-4596 ） （ eISSN:1095-726X ）

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    Publishing type：Research paper (scientific journal)  

    Spinel-type CoV2O4 compound shows cubic-to-tetragonal phase transition with a very small distortion (1 - c/a < 0.06%) at T* similar to 90 K. The other structural phase transition accompanied by change in space group occurs at T-2 = 59 K. In this study, we investigated the substitution effects on successive structural phase transitions using the high-angular-resolution powder diffraction technique to clarify the origin of these unique phase transitions. In the Cr substitution system Co(V1-xCrx)O-4 (0 <= x <= 0.25), while both of these structural transitions were suppressed, they disappeared at different x values. By contrast, in the Mn substitution system (Co1-xMnx)V2O4 (0 <= x <= 0.2) both of them remained. It was suggested that the phase transitions at T* and T-2 are dominantly related to the magnetic phase transition and orbital degree of freedom of V3+ ions, respectively.

    DOI： 10.1016/j.jssc.2019.02.016

  • Solid-solution alloy nanoparticles of a combination of immiscible Au and Ru with a large gap of reduction potential and their enhanced oxygen evolution reaction performance Reviewed

    Q. Zhang, K. Kusada, D. Wu, N. Ogiwara, T. Yamamoto, T. Tomiyama, S. Matsumura, S. Kawaguchi, Y. Kubota, T. Honma and Hiroshi Kitagawa

    Chem. Sci. 雑誌   10   5133 - 5137   2019.04

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  • A CO Adsorption Site Change Induced by Copper Substitution in a Ruthenium Catalyst for Enhanced CO Oxidation Activity

    Bo Huang, Hirokazu Kobayashi, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Yoshihide Nishida, Katsutoshi Sato, Katsutoshi Nagaoka, Masaaki Haneda, Wei Xie, Yusuke Nanba, Michihisa Koyama, Fenglong Wang, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Angewandte Chemie - International Edition   58 ( 8 )   2230 - 2235   2019.02（ ISSN:1433-7851 ） （ eISSN:1521-3773 ）

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    Publishing type：Research paper (scientific journal)  

    © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Ru is an important catalyst in many types of reactions. Specifically, Ru is well known as the best monometallic catalyst for oxidation of carbon monoxide (CO) and has been practically used in residential fuel cell systems. However, Ru is a minor metal, and the supply risk often causes violent fluctuations in the price of Ru. Performance-improved and cost-reduced solid-solution alloy nanoparticles of the Cu-Ru system for CO oxidation are now presented. Over the whole composition range, all of the Cu x Ru 1−x nanoparticles exhibit significantly enhanced CO oxidation activities, even at 70 at % of inexpensive Cu, compared to Ru nanoparticles. Only 5 at % replacement of Ru with Cu provided much better CO oxidation activity, and the maximum activity was achieved by 20 at % replacement of Ru by Cu. The origin of the high catalytic performance was found as CO site change by Cu substitution, which was investigated using in situ Fourier transform infrared spectra and theoretical calculations.

    DOI： 10.1002/anie.201812325

    PubMed

  • SUS304の加工誘起マルテンサイト変態に伴う微細組織変化のTEM観察

    森茂生，久保田佳基，菖蒲敬久，秦野正治

    日本金属学会報まてりあ 雑誌   58   2019.02

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  • Emergence of high ORR activity through controlling local density-of-states by alloying immiscible Au and Ir.

    Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Wei Xie, Michihisa Koyama, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Chemical science   10 ( 3 )   652 - 656   2019.01

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    Publishing type：Research paper (scientific journal)   International / domestic magazine：International journal  

    The electronic structure of surface atoms has a great effect on catalytic activity because the binding energy of reactants is closely related to the electronic structure. Therefore, designing and controlling the local density of states (LDOS) of the catalyst surface would be a rational way to develop innovative catalysts. Herein, we first demonstrate a highly active AuIr solid-solution alloy electrocatalyst for the oxygen reduction reaction (ORR) by emulating the Pt LDOS profile. The calculated LDOS of Ir atoms on the Au0.5Ir0.5(111) surface closely resembled that of Pt(111), resulting in suitable oxygen adsorption energy on the alloy surface for the ORR. We successfully synthesized AuIr solid-solution alloys, while Ir and Au are immiscible even above their melting points in the bulk state. Although monometallic Ir or Au is not active for the ORR, the synthesized Au0.5Ir0.5 alloy demonstrated comparable activity to Pt at 0.9 V versus a reversible hydrogen electrode.

    DOI： 10.1039/c8sc04135k

    PubMed

  • Selective Ion Exchange in Supramolecular Channels in the Crystalline State Reviewed

    K. Ichihashi, D. Konno, K. Y. Maryunina, K. Inoue, K. Toyoda, S. Kawaguchi, Y. Kubota, Y. Tatewaki, T. Akutagawa, T. Nakamura, and S. Nishihara

    Angew. Chem. Int. Ed. 雑誌   58   4169 - 4172   2019.01

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  • Phase transitions with extremely small tetragonal distortion in substitution systems of CoV2O4 by high-angular-resolution synchrotron powder diffraction Reviewed

    S. Shimono, H. Ishibashi, S. Kawaguchi, and Y. Kubota

    J. Sol. Stat. Chem. 雑誌   273   37 - 44   2019.01

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  • Excess heat capacity observed in Stuffed Tridymite-type Oxide Ba<sub>1-x</sub>Sr<sub>x</sub>Al<sub>2</sub>O<sub>4</sub>

    Ishii Yui, Ouchi Yuhya, Yamamoto Arisa, Kawaguchi Shogo, Ishibashi Hiroki, Kubota Yoshiki, Mori Shigeo

    Meeting Abstracts of the Physical Society of Japan   74.2   2224 - 2224   2019（ eISSN:2189-0803 ）

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  • Emergence of high ORR activity through controlling local density-of-states by alloying immiscible Au and Ir Reviewed

    K. Kusada, D. Wu, T. Yamamoto, T. Tomiyama, S. Matsumura, W. Xie, M. Koyama, S. Kawaguchi, Y. Kubota and H. Kitagawa

    Chem. Sci. 雑誌   10   652 - 656   2018.12

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  • A CO Adsorption Site Change induced by Copper Substitution in a Ruthenium Catalyst for Enhanced CO Oxidation Activity Reviewed

    B. Huang, H. Kobayashi, T. Yamamoto, T. Tomiyama, S. Matsumura, Y. Nishida, K. Sato, K. Nagaoka, M. Haneda, W. Xie, Y. Nanba, M. Koyama, F. Wang, S. Kawaguchi, Y. Kubota, and H Kitagawa

    Angew. Chem. Int. Ed. 雑誌   58   2230 - 2235   2018.12

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  • Mechanochemical synthesis and characterization of metastable hexagonal Li4SnS4 solid electrolyte Reviewed

    K. Kanazawa, S. Yubuchi, C. Hotehama, M. Otoyama, S. Shimono, H. Ishibashi, Y. Kubota, A. Sakuda, A. Hayashi, and M. Tatsumisago

    Inorg. Chem. 雑誌   57   9925 - 9930   2018.07

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  • The Electronic State of Hydrogen in the  Phase of the Hydrogen-Storage Material PdH(D)x:Does a Chemical Bond Between Palladium and Hydrogen Exist? Reviewed

    S. Dekura, H. Kobayashi, R. Ikeda, M. Maesato, H. Yoshino, M. Ohba, T. Ishimoto, S. Kawaguchi, Y. Kubota, S. Yoshioka, S. Matsumura, T. Sugiyama, and H. Kitagawa

    Angew. Chem. Int. Ed. 雑誌   57   9823 - 9827   2018.07

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  • Crystal Structure-Dependent Thermal Stability and Catalytic Performance of AuRu3 Solid-Solution Alloy Nanoparticles Reviewed

    Q. Zhang, K. Kusada, D. Wu, S. Kawaguchi, Y. Kubota, and H. Kitagawa

    Chem. Lett. 雑誌   47   559 - 561   2018.06

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  • Selective control of fcc and hcp crystal structures in Au–Ru solid-solution alloy nanoparticles Reviewed

    Q. Zhang, K. Kusada, D. Wu, T. Yamamoto, T. Toriyama, S. Matsumura, S. Kawaguchi, Y. Kubota, and H. Kitagawa

    Nature Commun. 雑誌   9   1 - 9   2018.03

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  • Small crystal distortion and long-range antiferro-orbital ordering in spinel oxide CoV2O4 Reviewed

    H. Ishibashi, S. Shimono, K. Tomiyasu, S. Lee, S. Kawaguchi, H. Iwane, H. Nakao, S. Torii, T. Kamiyama, and Y. Kubota

    Phys. Rev. B 雑誌   96   2017.10

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  • High-throughput powder diffraction measurement system consisting of multiple MYTHEN detectors at beamline BL02B2 of SPring-8 Reviewed

    S. Kawaguchi, M. Takemoto, K. Osaka, E. Nishibori, C. Moriyoshi, Y. Kubota, Y. Kuroiwa, and K. Sugimoto

    Rev. Sci. Inst. 雑誌   88   2017.08

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  • Discovery of Hexagonal Structured Pd–B Nanocrystals Reviewed

    K. Kobayashi, H. Kobayashi, M. Maesato, M. Hayashi, T. Yamamoto, S. Yoshioka, S. Matsumura, T. Sugiyama, S. Kawaguchi, Y. Kubota, H. Nakanishi and H. Kitagawa

    Angew. Chem. Int. Ed. 雑誌   56   6578 - 6582   2017.05

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  • Solid-Solution Alloying of Immiscible Ru and Cu with Enhanced CO Oxidation Activity Reviewed

    B. Huang, H. Kobayashi, T. Yamamoto, S. Matsumura, Y. Nishida, K. Sato, K. Nagaoka, S. Kawaguchi, Y. Kubota and H. Kitagawa

    J. Am. Chem. Soc. 雑誌   139   4643 - 4646   2017.03

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  • The Room-Temperature Superionic Conductivity of Silver Iodide Nanoparticles under Pressure Reviewed

    T. Yamamoto, M. Maesato, N. Hirao, S. Kawaguchi, S. Kawaguchi, Y. Ohishi, Y. Kubota, H. Kobayashi and H. Kitagawa

    J. Am. Chem. Soc. 雑誌   139   1392 - 1395   2017.01

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  • First-Principles Calculation, Synthesis and Catalytic Properties of Rh1-xCux Alloy Nanoparticles Reviewed

    T. Komatsu, H. Kobayashi, K. Kusada, Y. Kubota, M. Takata, T. Yamamoto, S. Matsumura, K. Sato, K. Nagaoka and H. Kitagawa

    Chem.: A Eur. J. 雑誌   23   57 - 60   2016.11

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  • Giant thermal vibrations in the framework compounds Ba1-xSrxAl2O4 Reviewed

    S. Kawaguchi, Y. Ishii, E. Tanaka, H. Tsukasaki, Y. Kubota and S. Mori

    Phys. Rev. B 雑誌   94   2016.08

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  • Suppression of phase transitions at low temperature by chromium substitution in vanadium spinel Fe(V1-xCrx)2O4 Reviewed

    S. Kawaguchi, H. Ishibashi, K. Nagami and Y. Kubota

    J. Phys.: Condens. Matter 雑誌   28   2016.06

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  • Presence of ε-martensite as an intermediate phase during the strain-induced transformation of SUS304 stainless steel Reviewed

    M. Hatano, Y. Kubota, T. Shobu and S. Mori

    Phil. Mag. Lett. 雑誌   96   220 - 227   2016.06

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  • Phase transitions and off-stoichiometric effects of vanadium spinel oxide CoV2O4 Reviewed

    S. Shimono, H. Ishibashi, S. Kawaguchi, H. Iwane, S. Nishihara, K. Inoue, S. Mori and Y. Kubota

    Mater. Res. Express 雑誌   3   2016.06

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  • An Adsorbate Discriminatory Gate Effect in a Flexible Porous Coordination Polymer for Selective Adsorption of CO2 over C2H2 Reviewed

    M. Foo, R. Matsuda, Y. Hijikata, R. Krishna, H. Sato, S. Horike, A. Hori, J. Duan, Y. Sato, Y. Kubota, M. Takata and S. Kitagawa

    J. Am. Chem. Soc. 雑誌   138   3022 - 3030   2016.02

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  • Orthorhombic distortion and orbital order in the vanadium spinel FeV2O4 Reviewed

    S. Kawaguchi, H. Ishibashi, S. Nishihara, S. Mori, J. Campo, F. Porcher, O. Fabelo, K. Sugimoto, J. Kim, K. Kato, M. Takata, H. Nakao and Y. Kubota

    Phys. Rev. B 雑誌   93   2016.01

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  • Orthorhombic distortion and orbital order in the vanadium spinel FeV2O4 Reviewed

    S. Kawaguchi, H. Ishibashi, S. Nishihara, S. Mori, J. Campo, F. Porcher, O. Fabelo, K. Sugimoto, J. Kim, K. Kato, M. Takata, H. Nakao and Y. Kubota

    Phys. Rev. B 雑誌   93   2016.01

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  • ホモロガス相を有するGe-Sb-Te系化合物の結晶構造と熱電特性 Reviewed

    小菅厚子，石橋広記，久保田佳基，木舩弘一

    日本金属学会誌 雑誌   11   562 - 568   2015.11

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  • Formation Phases and Electrical Properties of Ge–Bi–Te Compounds with Homologous Structures Reviewed

    T. Omoto, H. Kanaya, H. Ishibashi, Y. Kubota, K. Kifune and A. Kosuga

    J. Electronic Materials 雑誌   45   1478 - 1483   2015.10

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  • Formation Phases and Electrical Properties of Ge–Bi–Te Compounds with Homologous Structures Reviewed

    T. Omoto, H. Kanaya, H. Ishibashi, Y. Kubota, K. Kifune and A. Kosuga

    J. Electronic Materials 雑誌   45   1478 - 1483   2015.10

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  • Hybrid Materials of Ni NP@MOF prepared by a Simple Synthetic Method Reviewed

    M. Mukoyoshi, H. Kobayashi, K. Kusada, M. Hayashi, T. Yamada, M. Maesato, J. Taylor, Y. Kubota, K. Kato, M. Takata, T. Yamamoto, S. Matsumura and H. Kitagawa

    Chem. Commun. 雑誌   51   12463 - 12466   2015.07

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  • Coordination nano-space as stage of hydrogen ortho-para conversion Reviewed

    T. Kosone, A. Hori, E. Nishibori, Y. Kubota, A. Mishima, M. Ohba, H. Tanaka, K. Kato, J. Kim, J. A. Real, S. Kitagawa and M. Takata

    R. Soc. Open Sci. 雑誌   2   2015.07

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  • Hybrid Materials of Ni NP@MOF prepared by a Simple Synthetic Method Reviewed

    M. Mukoyoshi, H. Kobayashi, K. Kusada, M. Hayashi, T. Yamada, M. Maesato, J. Taylor, Y. Kubota, K. Kato, M. Takata, T. Yamamoto, S. Matsumura and H. Kitagawa

    Chem. Commun. 雑誌   51   12463 - 12466   2015.07

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  • Coordination nano-space as stage of hydrogen ortho-para conversion Reviewed

    T. Kosone, A. Hori, E. Nishibori, Y. Kubota, A. Mishima, M. Ohba, H. Tanaka, K. Kato, J. Kim, J. A. Real, S. Kitagawa and M. Takata

    R. Soc. Open Sci. 雑誌   2   2015.07

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  • Structural changes and microstructures of Ba1-xSrxAl2O4 for 0 < x < 0.4 Reviewed

    E. Tanaka, Y. Ishii, H. Tsukasaki, S. Mori, M. Osada, H. Taniguchi, Y. Sato and Y. Kubota

    Journal of the Korean Physical Society 雑誌   66   1355 - 1358   2015.05

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  • Boundaries of the homologous phases in Sb-Te and Bi-Te binary alloy system Reviewed

    K. Kifune, T. Tachizawa, H. Kanaya, Y. Kubota, N. Yamada and T. Matsunaga

    J. Alloy Comp. 雑誌   645   382 - 387   2015.05

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  • Structural changes and microstructures of Ba1-xSrxAl2O4 for 0 < x < 0.4 Reviewed

    E. Tanaka, Y. Ishii, H. Tsukasaki, S. Mori, M. Osada, H. Taniguchi, Y. Sato and Y. Kubota

    Journal of the Korean Physical Society 雑誌   66   1355 - 1358   2015.05

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  • Remarkable Oxygen Intake/Release of BaYMn2O5+ Viewed from High-Temperature Crystal Structure Reviewed

    Teruki Motohashi, Taira Takahashi, Makoto Kimura, Yuji Masubuchi, Shinichi Kikkawa, Yoshiki Kubota, Yoji Kobayashi, Hiroshi Kageyama, Masaki Takata, Susumu Kitagawa and Ryotaro Matsuda

    J. Phys. Chem. C 雑誌   119   2356 - 2363   2015.01

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  • Ferro-to-antiferro orbital variation in vanadium spinel Fe1-xMnxV2O4 Reviewed

    Shogo Kawaguchi, Hiroki Ishibashi, Jungeun Kim, Yoshiki Kubota

    J. Phys.: Condens. Matter 雑誌   26   346001 - 1   2014.08

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  • Crystal structure, microstructure, and thermoelectric properties of GeSb6Te10 prepared by spark plasma sintering Reviewed

    Atsuko Kosuga, Kazuki Nakaia, Mie Matsuzawa, Yousuke Fujii, Ryoji Funahashi, Takuya Tachizawa, Yoshiki Kubota, Kouichi Kifune

    J. Alloy Comp. 雑誌   618   463 - 468   2014.08

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  • Enhanced thermoelectric performance in In-substituted GeSb6Te10 with homologous structure Reviewed

    Atsuko Kosuga, Kazuki Nakai, Mie Matsuzawa, Yousuke Fujii, Ryoji Funahashi, Takuya Tachizawa, Yoshiki Kubota and Kouichi Kifune

    APL Mater. 雑誌   2   086102 - 1   2014.08

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  • Hydrogen storage in Pd nanocrystals covered with a metal–organic framework Reviewed

    Guangqin Li, Hirokazu Kobayashi, Jared M. Taylor, Ryuichi Ikeda, Yoshiki Kubota, Kenichi Kato, Masaki Takata, Tomokazu Yamamoto, Shoichi Toh, Syo Matsumura and Hiroshi Kitagawa

    Nature Mater. 雑誌   13   802 - 806   2014.07

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  • Shape-Dependent Hydrogen-Storage Properties in Pd Nanocrystals: Which Does Hydrogen Prefer, Octahedron (111) or Cube (100)? Reviewed

    Guangqin Li, Hirokazu Kobayashi, Shun Dekura, Ryuichi Ikeda, Yoshiki Kubota, Kenichi Kato, Masaki Takata, Tomokazu Yamamoto, Syo Matsumura and Hiroshi Kitagawa

    J. Am. Chem. Soc. 雑誌   136   10222 - 10225   2014.07

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  • Iron Excess Effect in Structural and Magnetic Properties of Vanadium Spinel FeV2O4 Reviewed

    S. Kawaguchi, H. Ishibashi and Y. Kubota

    J. Phys. Soc. Jpn. 雑誌   83   074601 - 1   2014.06

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  • Structural Phase Transition and Microstructures in Stuffed Tridymite-Type Compounds; Ba(Al, Fe)2O4 Reviewed

    S. Mori, S. Katsumura, T. Ozaki, E. Tanaka, Y. Ishiia, K. Kurushima, Y. Kubota, H. Taniguchi

    Ferroelectrics 雑誌   464   116 - 121   2014.05

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  • First in situ NMR Observation of Hydrogen Adsorbed inside Cu3(btc)2 at Ambient Temperature and Pressure Reviewed

    Shun Dekura, Hirokazu Kobayashi, Guangqin Li, Ryuichi Ikeda, Yoshiki Kubota, Masaki Takata and Hiroshi Kitagawa

    Chem. Lett. 雑誌   43   1363 - 1364   2014.05

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  • Structural and Magnetic Properties in Spinel Oxide Fe1-xMnxV2O4 Reviewed

    Shogo Kawaguchi, Hiroki Ishibashi, Fumiya Miki, Yoshiki Kubota

    JPS Conf. Proc. 雑誌   1   2014.03

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  • Solid Solution Alloy Nanoparticles of Immiscible Pd and Ru Elements Neighboring on Rh: Changeover of the Thermodynamic Behavior for Hydrogen Storage and Enhanced CO-Oxidizing Ability Reviewed

    Kohei Kusada, Hirokazu Kobayashi, Ryuichi Ikeda, Yoshiki Kubota, Masaki Takata, Shoichi Toh, Tomokazu Yamamoto, Syo Matsumura, Naoya Sumi, Katsutoshi Sato, Katsutoshi Nagaoka, Hiroshi Kitagawa

    J. Am. Chem. Soc. 雑誌   136   1864 - 1871   2014.01

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  • An Ordered BCC CuPd Nanoalloy Synthesized via the Thermal Decomposition of Pd Nanoparticles Covered with a metal-Organic Framework under Hydrogen Gas Reviewed

    Guangqin Li, Hirokazu Kobayashi, Kohei Kusada, Jared M. Taylor, Yoshiki Kubota, Kenichi Kato, Masaki Takata, Tomokazu Yamamoto, Syo Matsumura and Hiroshi Kitagawa

    Chem. Commun. 雑誌   50   13750 - 13753   2014

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  • Microporous Structures Having Phenylene Fin: Significance of Substituent Groups for Rotational Linkers in Coordination Polymers Reviewed

    Ryotaro Matsuda, Wataru Kosaka, Ryo Kitaura, Yoshiki Kubota, Masaki Takata, Susumu Kitagawa

    Microporous and Mesoporous Materials 雑誌   189   83 - 90   2013.11

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  • High CO2/N2/O2/CO Separation in a Chemically Robust Porous Coordination Polymer with Low Binding Energy Reviewed

    Jingui Duan, Masakazu Higuchi, Rajamani Krishna, Tomokazu Kiyonaga, Yosuke Tsutsumi, Yohei Sato, Yoshiki Kubota, Masaki Takata, Susumu Kitagawa

    Chem. Sci. 雑誌   5   660 - 666   2013.10

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  • Anomalous magnetization behaviour in a single crystal of vanadium spinel FeV2O4 Reviewed

    Shogo Kawaguchi, Hiroki Ishibashi, Sadafumi Nishihara, Marina Miyagawa, Katsuya Inoue, Shigeo Mori, Yoshiki Kubota

    J. Phys.: Condens. Matter 雑誌   25   416005 - 1   2013.09

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  • Spin-Dependent Molecular Orientation of O2–O2 Dimer Formed in the Nanoporous Coordination Polymer Reviewed

    Akihiro Hori, Tatsuo C. Kobayashi, Yoshiki Kubota, Akira Matsuo, Kouichi Kindo, Jungeun Kim, Kenichi Kato, Masaki Takata, Hirotoshi Sakamoto, Ryotaro Matsuda, Susumu Kitagawa

    J. Phys. Soc. Jpn. 雑誌   82   084703 - 1   2013.07

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  • Structural Properties in Incommensurately Modulated Spinel Compound CuV2S4 Reviewed

    Shogo Kawaguchi, Hiroki Ishibashi, Naruki Tsuji, Jungeun Kim, Kenichi Kato, Masaki Takata, Yoshiki Kubota

    J. Phys. Soc. Jpn. 雑誌   82   064603 - 1   2013.05

  • Discovery of a Face-centered Cubic Ruthenium Nanoparticles: Facile Size-controlled Synthesis using the Chemical Reduction Method Reviewed

    Kohei Kusada, Hirokazu Kobayashi, Tomokazu Yamamoto, Syo Matsumura, Naoya Sumi, Katsutoshi Sato, Katsutoshi Nagaoka, Yoshiki Kubota, Hiroshi Kitagawa

    J. Am. Chem. Soc. 雑誌   135   5493 - 5496   2013.04

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  • Crystal structures of X-phase in the Sb–Te binary alloy system Reviewed

    Kouichi Kifune, Tomoko Fujita, Takuya Tachizawa, Yoshiki Kubota, Noboru Yamada, Toshiyuki Matsunaga

    Cryst. Res. Technol. 雑誌   48   1011 - 1021   2013

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    Kind of work：Joint Work  

  • Strutural Analysis of Spinel Compound CuV2S4 with Incommensurate Charge-Density Wave Reviewed

    Shogo Kawaguchi, Hiroki Ishibashi, Naruki Tsuji, Jungeun Kim, Kenichi Kato, Masaki Takata, Yoshiki Kubota

    J. Phys.: Conf. Ser. 雑誌   391   2012.12

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    Kind of work：Joint Work  

  • Study of Argon Gas Adsorption in Ordered Mesoporous MFI Zeolite Framework Reviewed

    Hae Sung Cho, Keiichi Miyasaka, Hyungjun Kim, Yoshiki Kubota, Masaki Takata, Susumu Kitagawa, Ryong Ryoo, Osamu Terasaki

    J. Phys. Chem. C 雑誌   116   25300 - 25308   2012.11

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    Kind of work：Joint Work  

  • Structural transformation of Sb-based high-speed phase-change material Reviewed

    Toshiyuki Matsunaga, Rie Kojima, Noboru Yamada, Yoshiki Kubota, Kouichi Kifune

    Acta Cryst. B 雑誌   68   559 - 570   2012.10

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    Kind of work：Joint Work  

  • A Stand-Alone Mesoporous Crystal Structure Model from an in situ X-ray Diffraction: Nitrogen Adsorption on 3D Cagelike Mesoporous Silica SBA-16 Reviewed

    Keiichi Miyasaka, Hiroko Hano, Yoshiki Kubota, Yangzheng Lin, Ryong Ryoo, Masaki Takata, Susumu Kitagawa, Alexander V. Neimark, Osamu Terasaki

    Chem. Eur. J. 雑誌   18   10300 - 10311   2012.07

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    Kind of work：Joint Work  

  • Ligand-based solid solution approach to stabilisation of sulphonic acid groups in porous coordination polymer Zr6O4(OH)4(BDC)6 (UiO-66) Reviewed

    Maw Lin Foo, Satoshi Horike, Tomohiro Fukushima, Yuh Hijikata, Yoshiki Kubota, Masaki Takata, Susumu Kitagawa

    Dalton Trans. 雑誌   41   13791 - 13794   2012.07

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    Kind of work：Joint Work  

  • Modular design of domain assembly in porous coordination polymer crystals via reactivity-directed crystallization process Reviewed

    Tomohiro Fukushima, Satoshi Horike, Hirokazu Kobayashi, Masahiko Tsujimoto, Seiji Isoda, Maw Lin Foo, Yoshiki Kubota, Masaki Takata, Susumu Kitagawa

    J. Am. Chem. Soc. 雑誌   134   13341 - 13347   2012.07

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    Kind of work：Joint Work  

  • Nanosize-Induced Drastic Drop in Equilibrium Hydrogen Pressure for Hydride Formation and Structural Stabilization in Pd-Rh Solid-Solution Alloys Reviewed

    Hirokazu Kobayashi, Hitoshi Morita, Miho Yamauchi, Ryuichi Ikeda, Hiroshi Kitagawa, Yoshiki Kubota, Kenichi Kato, Masaki Takata, Shoichi Toh, Syo Matsumura

    J. Am. Chem. Soc. 雑誌   134   12390 - 12393   2012.07

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    Kind of work：Joint Work  

  • Gas detection by structural variations of fluorescent guest molecules in a flexible porous coordination polymer Reviewed

    Nobuhiro Yanai, Koji Kitayama, Yuh Hijikata, Hiroshi Sato, Ryotaro Matsuda, Yoshiki Kubota, Masaki Takata, Motohiro Mizuno, Takashi Uemura, Susumu Kitagawa

    Nature Mater. 雑誌   10   787 - 793   2011.09

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    Kind of work：Joint Work  

  • Crystallization of the chalcogenide compound Sb8Te3 Reviewed

    Kouichi Kifune, Tomoko Fujita, Yoshiki Kubota, Noboru Yamada, Toshiyuki Matsunaga

    Acta Cryst. B 雑誌   67   381 - 385   2011.09

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    Kind of work：Joint Work  

  • Nanosize-Induced Hydrogen Storage and Capacity Control in a Non-Hydride-Forming Element: Rhodium Reviewed

    Hirokazu Kobayashi, Hitoshi Morita, Miho Yamauchi, Ryuichi Ikeda, Hiroshi Kitagawa, Yoshiki Kubota, Kenichi Kato, Masaki Takata

    J. Am. Chem. Soc. 雑誌   133   11034 - 110374   2011.07

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    Kind of work：Joint Work  

  • Hydrogen-Storage Properties of Solid-Solution Alloys of Immiscible Neighboring Elements with Pd Reviewed

    Kohei Kusada, Miho Yamauchi, Hirokazu Kobayashi, Hiroshi Kitagawa, Yoshiki Kubota

    J. Am. Chem. Soc. 雑誌   132   15896 - 15898   2010.10

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    Kind of work：Joint Work  

  • Control of Interpenetration for Tuning Structural Flexibility Impacts on Sorption Properties Reviewed

    Sareeya Bureekaew, Hiroshi Sato, Ryotaro Matsuda, Yoshiki Kubota, Raita Hirose, Jungeun Kim, Kenichi Kato, Masaki Takata, Susumu Kitagawa

    Angew. Chem. Int. Ed. 雑誌   49   7660 - 7664   2010.07

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    Kind of work：Joint Work  

  • Selective sorption of oxygen and nitric oxide by an electron-donating flexible porous coordination polymer Reviewed

    Satoru Shimomura, Masakazu Higuchi, Ryotaro Matsuda, Ko Yoneda, Yuh Hijikata, Yoshiki Kubota, Yoshimi Mita, Jungeun Kim, Masaki Takata, Susumu Kitagawa

    Nature Chem. 雑誌   2   633 - 637   2010.06

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    Kind of work：Joint Work  

  • Temperature responsive channel uniformity impacts on highly guest-selective adsorption in a porous coordination polymer Reviewed

    Ryotaro Matsuda, Takashi Tsujino, Hiroshi Sato, Yoshiki Kubota, Kunimitsu Morishige, Masaki Takata, Susumu Kitagawa

    Chem. Sci. 雑誌   1   315 - 321   2010.06

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    Kind of work：Joint Work  

  • Structural investigation of GeSb6Te10 and GeBi6Te10 intermetallic compounds in the chalcogenide homologous series Reviewed

    Toshiyuki Matsunaga, Rie Kojima, Noboru Yamada, Tomoko Fujita, Kouichi Kifune, Yoshiki Kubota, Masaki Takata

    Acta Cryst. B 雑誌   66   407 - 411   2010.06

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    Kind of work：Joint Work  

  • Solid Solutions of Soft Porous Coordination Polymers : Fine-Tuning of Gas Adsorption Properties Reviewed

    Ryotaro Matsuda, Takashi Tsujino, Hiroshi Sato, Yoshiki Kubota, Kunimitsu Morishige, Masaki Takata, Susumu Kitagawa

    Angew. Chem. Int. Ed. 雑誌   49   1 - 6   2010.05

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    Kind of work：Joint Work  

  • Atomic-Level Pd−Pt Alloying and Largely Enhanced Hydrogen-Storage Capacity in Bimetallic Nanoparticles Reconstructed from Core/Shell Structure by a Process of Hydrogen Absorption/Desorption Reviewed

    Hirokazu Kobayashi, Miho Yamauchi, Hiroshi Kitagawa, Yoshiki Kubota, Kenichi Kato, Masaki Takata

    J. Am. Chem. Soc. 雑誌   132   5576 - 5577   2010.04

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    Kind of work：Joint Work  

  • Systematic Construction of Porous Coordination Pillared-Layer Structures and Their Sorption Properties Reviewed

    Hirotoshi Sakamoto, Ryo Kitaura, Ryotaro Matsuda, Susumu Kitagawa, Yoshiki Kubota, Masaki Takata

    Chem. Lett. 雑誌   39   218 - 219   2010.02

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    Kind of work：Joint Work  

  • Porous Coordination Polymer with Pyridinium Cationic Surface, [Zn2(tpa)2(cpb)] Reviewed

    Masakazu Higuchi, Daisuke Tanaka, Satoshi Horike, Hirotoshi Sakamoto, Kohei Nakamura, Yohei Takashima, Yuh Hijikata, Nobuhiro Yanai, Jungeun Kim, Kenichi Kato, Yoshiki Kubota, Masaki Takata, Susumu Kitagawa

    J. Am. Chem. Soc. 雑誌   131   10336 - 10337   2009.07

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    Kind of work：Joint Work  

  • Incommensurate guest adsorption in bellows-shaped one-dimensional channels of porous coordination polymers Reviewed

    Ryotaro Matsuda, Ryo Kitaura, Yoshiki Kubota, Tatsuo C. Kobayashi, Masaki Takata, Susumu Kitagawa

    Microporous and Mesoporous Materials 雑誌   129   296 - 303   2009.06

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    Kind of work：Joint Work  

  • Hindered Rotation of Methane Molecules in the One-Dimensional Nanochannel of a Porous Coordination Polymer Reviewed

    Yoshiki Kubota, Masaki Takata, Ryo Kitaura, Ryotaro Matsuda, Tatsuo C. Kobayashi, Susumu Kitagawa

    J. Nanosci. Nanotechnol. 雑誌   9   69 - 76   2008.12

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    Kind of work：Joint Work  

  • Nanochannels of Two Distinct Cross-Sections in a Porous Al-Based Coordination Polymer Reviewed

    Angiolina Comotti, Silvia Bracco, Piero Sozzani, Satoshi Horike, Ryotaro Matsuda, Jinxi Chen, Masaki Takata, Yoshiki Kubota, Susumu Kitagawa

    J. Am. Chem. Soc. 雑誌   130   13664 - 13672   2008.10

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    Kind of work：Joint Work  

  • Electron charge distribution of CaAl2-xZnx : Maximum Entropy Method combined with Rietveld analysis of high-resolution-synchrotron X-ray powder diffraction data Reviewed

    Karin S?derberg, Yoshiki Kubota, Norihiro Muroyama, Daniel Gr?ner, Arisa Yoshimura, Osamu Terasaki

    J. Solid Stat. Chem. 雑誌   181   1998 - 2005   2008.08

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    Kind of work：Joint Work  

  • Structural Features of Ge1Sb4Te7, an Intermetallic Compound in the GeTe-Sb2Te3 Homologous Seriese Reviewed

    Toshiyuki Matsunaga, Rie Kojima, Noboru Yamada, Kouichi Kifune, Yoshiki Kubota, Masaki Takata

    Chem. Mater. 雑誌   20   5750 - 5755   2008.08

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    Kind of work：Joint Work  

  • Argon adsorption on MCM-41 mesoporous crystal studied by in situ synchrotron powder X-ray diffraction Reviewed

    Norihiro Muroyama, Arisa Yoshimura, Yoshiki Kubota, Keiichi Miyasaka, Tetsu Ohsuna, Ryong Ryoo, Peter I. Ravikovitch, Alexander V. Neimark, Masaki Takata, Osamu Terasaki

    J. Phys. Chem. C 雑誌   112   10803 - 10813   2008.07

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    Kind of work：Joint Work  

  • Structural characteristics of GeTe-rich GeTe-Sb2Te3 pseudobinary metastable crystals Reviewed

    T. Matsunaga, H. Morita, R. Kojima, N. Yamada, K. Kifune, Y. Kubota, Y. Tabata, J.-J. Kim, M. Kobata, E. Ikenaga, K. Kobayashi

    J. Appl. Phys. 雑誌   103   2008.05

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    Kind of work：Joint Work  

  • Kinetic Gate-Opening Process in a Flexible Porous Coordination Polymer Reviewed

    Daisuke Tanaka, Keiji Nakagawa, Masakazu Higuchi, Satoshi Horike, Yoshiki Kubota, Tatsuo C. Kobayashi, Masaki Takata, Susumu Kitagawa

    Angew. Chem. Int. Ed. 雑誌   47   3914 - 3918   2008.04

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    Kind of work：Joint Work  

  • Cation disorder and phase transitions in the four-layer ferroelectric Aurivillius phases ABi4Ti4O15 (A=Ca, Sr, Ba, Pb) Reviewed

    Brendan J. Kennedy, Qingdi Zhou, Ismunandar, Yoshiki Kubota, Kenichi Kato

    J. Solid Stat. Chem. 雑誌   181   1377 - 1386   2008.03

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    Kind of work：Joint Work  

  • On the Nature of Strong Hydrogen Atom Trapping Inside Pd Nanoparticles Reviewed

    Hirokazu Kobayashi, Miho Yamauchi, Hiroshi Kitagawa, Yoshiki Kubota, Kenichi Kato, Masaki Takata

    J. Am. Chem. Soc. 雑誌   130   1828 - 1829   2008.01

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    Kind of work：Joint Work  

  • Hydrogen Absorption in the Core/Shell Interface of Pd/Pt Nanoparticles Reviewed

    Hirokazu Kobayashi, Miho Yamauchi, Hiroshi Kitagawa, Yoshiki Kubota, Kenichi Kato, Masaki Takata

    J. Am. Chem. Soc. 雑誌   130   1818 - 1819   2008.01

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    Kind of work：Joint Work  

  • The anti-polar structure of CH3NH3PbBr3 Reviewed

    H. Mashiyama, Y. Kawamura, Y. Kubota

    J. Korean Phys. Soc. 雑誌   51   850 - 853   2007.08

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    Kind of work：Joint Work  

  • Observation of gas molecules adsorbed in the nanochannels of porous coordination polymers by the in situ synchrotron powder diffraction experiment and the MEM/Rietveld charge density analysis Reviewed

    Yoshiki Kubota, Masaki Takata, Tatsuo C. Kobayashi, Susumu Kitagawa

    Coord. Chem. Rev. 雑誌   251   2510 - 2521   2007.08

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    Kind of work：Joint Work  

  • Crystal structures and phase transitions in Ba2HoTaO6 Reviewed

    Brendan J. Kennedy, Paul J. Saines, Yoshiki Kubota , Chiharu Minakata, Hiroko Hano, Kenichi Kato, Masaki Takata

    Materials Research Bulletin 雑誌   42   1875 - 1880   2007.07

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    Kind of work：Joint Work  

  • Anion Incorporation-induced Cage Deformation in 12CaO・7Al2O3 Crystal Reviewed

    Takatoshi Nomura, Katsuro Hayashi, Yoshiki Kubota, Toshio Kamiya, Masahiro Hirano, Masaki Takata, Hideo Hosono

    Chem. Lett 雑誌   36   902 - 903   2007.06

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    Kind of work：Joint Work  

  • Structural investigation of Ge3Sb2Te6, an intermetallic compound in the GeTe-Sb2Te3 homologous series Reviewed

    Toshiyuki Matsunaga, Rie Kojima, Noboru Yamada, Kouichi Kifune, Yoshiki Kubota, Masaki Takata

    Appl. Phys. Lett. 雑誌   90   2007.05

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    Kind of work：Joint Work  

  • Topotactic Linear Radical Polymerization of Divinylbenzenes in Porous Coordination Polymers Reviewed

    Takashi Uemura, Daisuke Hiramatsu, Yoshiki Kubota, Masaki Takata, Susumu Kitagawa

    Angew. Chem. Int. Ed. 雑誌   46   4987 - 4990   2007.05

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    Kind of work：Joint Work  

  • Crystal structures of stable and metastable Ge2Bi2Te5, an intermetallic compound in a GeTe-Bi2Te3 pseudobinary system Reviewed

    Toshiyuki Matsunaga, Rie Kojima, Noboru Yamada, Kouichi Kifune, Yoshiki Kubota, Masaki Takata

    Acta Cryst. B 雑誌   63   346 - 352   2007.04

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    Kind of work：Joint Work  

  • Metallic State in a Lime-Almina Compound with Nanoporous Structure Reviewed

    Sung Wng Kim, Satoru Matsuishi, Takatoshi Nomura, Yoshiki Kubota, Masaki Takata, Katsuro Hayashi, Toshio Kamiya, Masahiro Hirano, Hideo Hosono

    Nano Lett. 雑誌   7   1138 - 1143   2007.03

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    Kind of work：Joint Work  

  • Stabilization of the gamma phase in Fe-Pt alloy nanoparticles with low Pt contents prepared by chemical synthesis Reviewed

    Tsugio Tadaki, Kouichi Kifune, Yoshiki Kubota, Hiroshi Yamaoka

    Mat. Sci. Eng. A 雑誌   438-440   407 - 410   2006.12

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    Kind of work：Joint Work  

  • Crystal structures and phase stability in pseudobinary CaAl2-xZnx Reviewed

    Karin S?derberg, Magnus Bostr?m, Yoshiki Kubota, Takeshi Nishimatsu, Rainer Niewa, Ulrich H?ussermann, Yuri Grin, Osamu Terasaki

    J. Sol. Stat. Chem. 雑誌   179   2690 - 2697   2006.08

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    Kind of work：Joint Work  

  • An Analytical Approach to Determine the Pore Shape and Size of MCM-41 Materials from X-ray Diffraction Data Reviewed

    Norihiro Muroyama, Tetsu Ohsuna, Ryong Ryoo, Yoshiki Kubota, Osamu Terasaki

    J. Phys. Chem. B 雑誌   110   10630 - 10635   2006.06

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    Kind of work：Joint Work  

  • Metastable Sorption State of a Metal-Organic Porous Material Determined by In Situ Synchrotron Powder Diffraction Reviewed

    Yoshiki Kubota, Masaki Takata, Ryotaro Matsuda, Ryo Kitaura, Susumu Kitagawa, Tatsuo C. Kobayashi

    Angew. Chem. Int. Ed. 雑誌   45   4932 - 4936   2006.06

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    Kind of work：Joint Work  

  • Single Structure Widely Distributed in a GeTe-Sb2Te3 Pseudobinary System: A Rock Salt Structure is Retained by Intrinsically Containing an Enormous Number of Vacancies within its Crystal Reviewed

    Toshiyuki Matsunaga, Rie Kojima, Noboru Yamada, Kouichi Kifune, Yoshiki Kubota, Yoshikazu Tabata, Masaki Takata

    Inorg. Chem. 雑誌   45   2235 - 2241   2006.01

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    Kind of work：Joint Work  

  • Formation and Characterization of Crystalline Molecular Arrays of Gas Molecules in a 1-Dimensional Ultramicropore of a Porous Copper Coordination Polymer Reviewed

    Ryo Kitaura, Ryotaro Matsuda, Yoshiki Kubota, Susumu Kitagawa, Masaki Takata, Tatsuo C. Kobayashi, Megumi Suzuki

    J. Phys. Chem. B 雑誌   109   23378 - 23385   2005.10

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    Kind of work：Joint Work  

  • Highly controlled acetylene accommodation in a metal-organic microporous material Reviewed

    Ryotaro Matsuda, Ryo Kitaura, Susumu Kitagawa, Yoshiki Kubota, Rodion V. Belosludov, Tatsuo C. Kobayashi, Hirotoshi Sakamoto,Takashi Chiba, Masaki Takata, Yoshiyuki Kawazoe, Yoshimi Mita

    Nature 雑誌   436   238 - 241   2005.07

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    Kind of work：Joint Work  

  • Extremely long period-stacking structure in the Sb-Te binary system Reviewed

    Kouichi Kifune, Yoshiki Kubota, Toshiyuki Matsunaga, Noboru Yamada

    Acta Cryst. B 雑誌   61   492 - 497   2005.06

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    Kind of work：Joint Work  

  • Direct Observation of Hydrogen Molecules Adsorbed onto a Microporous Coordination Polymer Reviewed

    Yoshiki Kubota, Masaki Takata, Ryotaro Matsuda, Ryo Kitaura, Susumu Kitagawa, Kenichi Kato, Makoto Sakata, Tatsuo C. Kobayashi

    Angew. Chem. Int. Ed. 雑誌   44   920 - 923   2005.02

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    Kind of work：Joint Work  

  • Crystal structures of stable and metastable Ge2Sb2Te5, an intermetallic compound in GeTe-Sb2Te3 pseudobinary system Reviewed

    Toshiyuki Matsunaga, Noboru Yamada, Yoshiki Kubota

    Acta Cryst. B 雑誌   60   685 - 691   2004.11

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    Kind of work：Joint Work  

  • Guest Shape-Responsive Fitting Porous Coordination Polymer with Shrinkable Framework Reviewed

    Ryotaro Matsuda, Ryo Kitaura, Susumu Kitagawa, Yoshiki Kubota, Tatsuo C. Kobayashi, Satoshi Horike, Masaki Takata

    J. Am. Chem. Soc. 雑誌   126   14063 - 14070   2004.11

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    Kind of work：Joint Work  

  • Motion of Methanol Adsorbed in Porous Coordination Polymer with Paramagnetic Metal ions Reviewed

    Satoshi Horike, Ryotaro Matsuda, Ryo Kitaura, Susumu Kitagawa, Takahiro Iijima, Kazunaka Endo, Yoshiki Kubota, Masaki Takata

    Chem. Commun. 雑誌   2004.10

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    Kind of work：Joint Work  

  • Rational Design and Crystal Structure Determination of 3-D Metal-Organic Jungle-Gym-like Open Framework Reviewed

    Ryo Kitaura, Fumiyasu Iwahori, Ryotaro Matsuda, Susumu Kitagawa, Yoshiki Kubota, Masaki Takata, Tatsuo C. Kobayashi

    Inorg. Chem. 雑誌   43   6522 - 6524   2004.10

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    Kind of work：Joint Work  

  • Formation of a One-Dimensional Array of Oxygen in a Microporous Metal-Organic Solid Reviewed

    Ryo Kitaura, Susumu Kitagawa, Yoshiki Kubota, Tatsuo Kobayashi, Koichi Kindo, Yoshimi Mita, Akira Matsuo, Michihiro Kobayashi, Ho-Chol Chang, Tadashi Ozawa, Megumi Suzuki, Makoto Sakata and Masaki Takata

    Science 雑誌   298   2358 - 2361   2003.12

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    Kind of work：Joint Work  

  • Capacity fading of the acid-treated lithium manganese oxides in high-temperature storage Reviewed

    Motoharu Saito, Shinichiro Yoshida, Hisayuki Yamane, Mitsuru Sano, Miho Fujita, Koichi Kifune, Yoshiki Kubota

    J.Power Sources 雑誌   122   162 - 168   2003.12

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    Kind of work：Joint Work  

  • Structural phase transitions in the layered bismuth oxide BaBi4Ti4O15 Reviewed

    Brendan J. Kennedy, Yoshiki Kubota, Brett.A.Hunter, Ismunandar and Kenichi Kato

    Solid State Commun. 雑誌   126   653 - 658   2003.12

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    Kind of work：Joint Work  

  • Displacive Character of the Cubic-Tetragonal Transition in CH3NH3PbX3 Reviewed

    H.Mashiyama, Y.Kawamura, E.Magome and Yoshiki Kubota

    J.Korean Phys.Soc. 雑誌   42   1026 - 1029   2003.12

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    Kind of work：Joint Work  

  • High Resolution Debye-Scherrer Camera installed at SPring-8 Reviewed

    M.Takata, E.Nishibori, K.Kato, Y.Kubota, Y.Kuroiwa and M.Sakata

    Advances in X-Ray Analysis 雑誌   45   377 - 384   2003.12

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    Kind of work：Joint Work  

  • First order orthorhombic-to-tetragonal phase transition in Sr0.5Ba0.5HfO3 Reviewed

    B.J.Kennedy, L.Li, R.F.Garrett, Y.Kubota and K.Kato

    Solid State Commun. 雑誌   122   355 - 358   2002.12

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    Kind of work：Joint Work  

  • The large Debye-Scherrer camera installed at SPring-8 BL02B2 for charge density studies Reviewed

    E.Nishibori, M.Takata, K.Kato, M.Sakata, Y.Kubota, S.Aoyagi, Y.Kuroiwa, M.Yamakata and N.Ikeda

    J.Phys.Chem.Solid 雑誌   62   2095 - 2098   2001.12

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    Kind of work：Joint Work  

  • The large Debye-Scherrer camera installed at SPring-8 BL02B2 for charge density studies Reviewed

    E.Nishibori, M.Takata, K.Kato, M.Sakata, Y.Kubota, S.Aoyagi, Y.Kuroiwa, M.Yamakata, and N.Ikeda

    Nuclear Instruments and Methods in Physics Research A 雑誌   467-468   1045 - 1048   2001.12

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    Kind of work：Joint Work  

  • Structure and Displacive Phase Transformations of Small Particles of In-Pb Alloys Reviewed

    K.Asaka, E.Kitahata, Y.Hirotsu, K.Kifune, Y.Kubota and T.Tadaki

    Scripta Mater. 雑誌   44   2043 - 2046   2001.12

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    Kind of work：Joint Work  

  • Covalent Bonds in AlMnSi Icosahedral Quasicrystalline Approximant Reviewed

    K.Kirihara, T.Nakata, M.Takata, Y.Kubota, E.Nishibori, K.Kimura and M.Sakata

    Phys.Rev.Lett. 雑誌   85   3468 - 3471   2000.12

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    Kind of work：Joint Work  

  • Structural studies of cation disorder in the ferroelectric oxide SrBi2Ta2O9 Reviewed

    R.Macquart, B.Kennedy, Y.Kubota, E.Nishibori and M.Takata

    Ferroelectics 雑誌   248   27 - 32   2000.12

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    Kind of work：Joint Work  

  • Electron?density distribution of approximants of the icosahedral Al-based alloys by the maximum-entropy method and Rietveld refinement Reviewed

    K.Kirihara, T.Nakata, M.Takata, Y.Kubota, E.Nishibori, K.Kimura and M.Sakata

    Mat.Sci.Eng.A 雑誌   294-296   492 - 495   2000.12

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    Kind of work：Joint Work  

  • A Charge Density Study of the Intermetallic Compound MgCu2 by the Maximum Entropy Method Reviewed

    Y.Kubota, M.Takata, M.Sakata, T.Ohba, K.Kifune and T.Tadaki

    J.Phys.:Condens.Matter 雑誌   12   1253 - 1259   2000.10

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    Kind of work：Joint Work  

▼display all

MISC

  • 充填トリジマイト型酸化物Ba<sub>0.93</sub>Sr<sub>0.07</sub>Al<sub>2</sub>O<sub>4</sub>の構造不安定性

    石井悠衣, 大内雄也, 河口彰吾, 石橋広記, 久保田佳基, 森茂生

    日本物理学会講演概要集(CD-ROM)   74 ( 1 )   ROMBUNNO.15aK107‐6   2019.03（ ISSN:2189-079X ）

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Works

  • Structure Analysis of the Gas Molecules Adsorbed into the Microporous Coordination Polymers

    2002

  • Accurate Charge Density Analysis of Laves Phase Intermetallic Compounds

    1993

Outline of collaborative research (seeds)

  • X線回折による粉末結晶構造解析

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    放射光を含めたX線回折法により，金属やセラミックス，錯体の結晶構造解析を行う。

Grant-in-Aid for Scientific Research

  • 不可逆ガス吸着過程をターゲットにしたミリ秒高精度粉末回折手法の開発

    Grant-in-Aid for Scientific Research(B)  2025

  • 不可逆ガス吸着過程をターゲットにしたミリ秒高精度粉末回折手法の開発

    Grant-in-Aid for Scientific Research(B)  2024

  • Exploration of uncharted material fields with single-molecule electrets

    Grant-in-Aid for Scientific Research(A)  2024

Charge of on-campus class subject

  • 物理学特別講義1B

    2024   Intensive lecture   Graduate school

  • 物理学特別研究2A

    2024   Intensive lecture   Graduate school

  • 物理学特別研究1A

    2024   Intensive lecture   Graduate school

  • 物理学特別演習2A

    2024   Intensive lecture   Graduate school

  • 物理学特別演習1A

    2024   Intensive lecture   Graduate school

  • 物理学特別研究3A

    2024   Intensive lecture   Graduate school

  • 物理学特別演習5A

    2024   Intensive lecture   Graduate school

  • 物理学特別演習4A

    2024   Intensive lecture   Graduate school

  • 物理学特別演習3A

    2024   Intensive lecture   Graduate school

  • 物理学特別講義2B

    2024   Intensive lecture   Graduate school

  • 物理学特別研究5A

    2024   Intensive lecture   Graduate school

  • 物理学特別研究4A

    2024   Intensive lecture   Graduate school

  • 基礎物理学実験2A

    2024   Weekly class   Graduate school

  • 物理学実験ＳＢ

    2024   Weekly class   Undergraduate

  • Demonstration of Experiments in Physics II

    2021   Practical Training  

  • Demonstration of Experiments in Physics I

    2021   Practical Training  

  • Solid State Physics A

    2021    

  • Structure of Solid

    2021    

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  • 波を使って原子の並びを調べる 放射光（X線）による材料研究

    Category：Science (mathematics, physics, chemistry, biology, geology, biochemistry),　Engineering (machinery, electronics / physics, electrical / electronics, electrical information, chemical biotechnology, architecture, cities (civil engineering / environment), material chemistry, aerospace, marine systems, applied chemistry, chemistry, materials)

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    Audience：Junior high school students,　High school students,　College students,　General,　Company

    Keyword：放射光, X線, 原子, 電子 

    波の干渉（X線回折）を利用して結晶内の原子配列を調べる方法を，デモ実験などをとおして解説する。また，放射光を利用した材料科学の研究を紹介する。