Updated on 2025/08/22

Information

 

写真a

 
KUSADA KOHEI
 
Organization
Institute for Advanced Study Associate Professor
Title
Associate Professor
Homepage
External link

Research Areas

  • Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

  • Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

Degree

  • Ph.D. (Science) （ 2013.3 Kyoto University ）

Research History

  • Kyushu University Institute for Advanced Study  Associate Professor 

    2025.4 - Present

  • Kyushu University Institute for Advanced Study Associate Professor 

    2025.4 - Present

  • JST PRESTO researcher   

    2020.12 - Present

  • Kyoto University   

Papers

  • All Iron-Group and Platinum-Group Elements Metal High-Entropy Alloy Nanoparticles

    Mahin, J; Kusada, K; Mukoyoshi, M; Yamamoto, T; Toriyama, T; Murakami, Y; Sakata, O; Kawaguchi, S; Ashitani, H; Kubota, Y; Kitagawa, H

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   64 ( 31 )   e202502552   2025.6   （ ISSN:14337851 eISSN:1521-3773 ）

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    Language：English   Publisher：Angewandte Chemie International Edition  

    High-entropy alloys (HEA) are promising catalyst materials for important energy transformations. So far, the focus has been on platinum-group metals, which possess excellent catalytic performance and similar properties, thus being easy to synthesize. However, incorporating more abundant and cheaper elements is preferable for large-scale applications and is fundamentally more interesting, as elements with different properties are expected to greatly affect the structural and electronic characteristics of the resulting alloy. Unfortunately, significant differences in elemental properties greatly complicate the synthesis and require extreme reaction conditions. In this work, we demonstrate the first synthesis of high-entropy alloy nanoparticles containing the nine neighboring elements used most often in heterogeneous catalysis: all the iron-group metals (Fe, Co, and Ni) and all the platinum-group metals (Ru, Rh, Pd, Os, Ir, and Pt) through a simple low-temperature solution process. Remarkably, alloying the iron-group base metals with the platinum-group metals results in 30% increase in the catalytic activity for the hydrogen evolution reaction (HER) under acidic conditions (TOF@25 mV = 1.58 s<sup>−1</sup>) compared to the equivalent alloy containing only platinum-group metals conditions (TOF@25 mV = 1.2 s<sup>−1</sup>). This activity is three times that of a commercial Pt/C catalyst (TOF@25 mV = 0.58 s<sup>−1</sup>), demonstrating simultaneous reduction in precious metal content and performance enhancement of electrocatalysts.

    DOI： 10.1002/anie.202502552

    Web of Science

    Scopus

    PubMed

  • Enhancing Hydrogen Storage Capacity of Pd Nanoparticles by Sandwiching between Inorganic Nanosheets

    Ament, K; Kobayashi, H; Kusada, K; Breu, J; Kitagawa, H

    ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE   648 ( 10 )   2022.5   （ ISSN:0044-2313 eISSN:1521-3749 ）

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  • Enhancing Hydrogen Storage Capacity of Pd Nanoparticles by Sandwiching between Inorganic Nanosheets

    Ament K., Kobayashi H., Kusada K., Breu J., Kitagawa H.

    Zeitschrift Fur Anorganische Und Allgemeine Chemie   648 ( 10 )   2022.5   （ ISSN:00442313 ）

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    Publisher：Zeitschrift Fur Anorganische Und Allgemeine Chemie  

    H<inf>2</inf> is regarded to play a crucial role in the transition from a fossil fuel-based energy economy towards an environmentally friendly one. However, storage of H<inf>2</inf> is still challenging, but palladium (Pd) based materials show exciting properties. Therefore, nanoparticulate Pd has been intensely studied for hydrogen storage in the past years. Here, we stabilize Pd nanoparticles by intercalation between inorganic nanosheets of hectorite (NaHec). Compared to nanoparticles stabilized by the polymer polyvinylpyrrolidone (PVP), the H<inf>2</inf> storage capacity was found to be 86 % higher for identical Pd nanoparticles being intercalated between nanosheets. We attribute this remarkably enhanced H<inf>2</inf> storage capacity to the partial oxidation of Pd, as evidenced by X-ray photoelectron spectroscopy (XPS). The higher amount of holes in the 4d band leads to a higher amount of H<inf>2</inf> that can be absorbed when Pd is stabilized between the nanosheets of hectorite compared to the PVP stabilized nanoparticles.

    DOI： 10.1002/zaac.202100370

    Scopus

  • Silicon-based plasmonic photodetector in the near-infrared region with a Schottky barrier properly controlled by nanoalloys

    Okamoto, S. and Kusada, K. and Nomura, Y. and Takeda, E. and Inada, Y. and Hisada, K. and Anada, S. and Yamamoto, K. and Hirasawa, T. and Kitagawa, H.

    Research Square   2022

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  • On the electronic structure and hydrogen evolution reaction activity of platinum group metal-based high-entropy-alloy nanoparticles (vol 11, pg 12731, 2020)

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

    CHEMICAL SCIENCE   12 ( 20 )   7196 - 7196   2021.5   （ ISSN:2041-6520 eISSN:2041-6539 ）

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  • Frontispiece: New Aspects of Platinum Group Metal‐Based Solid‐Solution Alloy Nanoparticles: Binary to High‐Entropy Alloys

    Kohei Kusada and Dongshuang Wu and Hiroshi Kitagawa

    Chemistry – A European Journal   26 ( 23 )   2020.4

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    Publisher：Wiley  

    DOI： 10.1002/chem.202082361

  • Magnetic-Field Dependence of Novel Gap Behavior Related to the Quantum-Size Effect

    Okuno, T. and Kinoshita, Y. and Matsuzaki, S. and Kitagawa, S. and Ishida, K. and Hirata, M. and Sasaki, T. and Kusada, K. and Kitagawa, H.

    arXiv   2020   （ ISSN:23318422 ）

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  • NMR-based gap behavior related to the quantum size effect

    Okuno, T. and Manago, M. and Kitagawa, S. and Ishida, K. and Kusada, K. and Kitagawa, H.

    arXiv   2020   （ ISSN:23318422 ）

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  • Towards an understanding of the chemisorption and catalytic activity of PdXRu1X nanoparticles using photoelectron spectroscopy

    Gueye, I. and Yang, A. and Kumara, L.S.R. and Hiroi, S. and Seo, O. and Kim, J. and Kusada, K. and Kitagawa, H. and Sakata, O.

    arXiv   2019   （ ISSN:23318422 ）

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  • Alloy microparticles and method for producing same, alloy microparticle cluster, catalyst, and method for producing same

    Kitagawa, Hiroshi and Kusada, Kohei and Kobayashi, Hirokazu and Nagaoka, Katsutoshi and Sato, Katsutoshi and Matsumura, Syo and Yamamoto, Tomokazu

    2018.5

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    Publisher：Google Patents  

  • Crystal Structure-dependent Thermal Stability and Catalytic Performance of AuRu3 Solid-solution Alloy Nanoparticles

    Zhang, Quan and Kusada, Kohei and Wu, Dongshuang and Kawaguchi, Shogo and Kubota, Yoshiki and Kitagawa, Hiroshi

    Chemistry Letters   47 ( 4 )   559 - 561   2018

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    Publisher：The Chemical Society of Japan  

  • Solid-Solution Alloy Nanoparticles of the Immiscible Iridium--Copper System with a Wide Composition Range for Enhanced Electrocatalytic Applications

    Wang, Fenglong and Kusada, Kohei and Wu, Dongshuang and Yamamoto, Tomokazu and Toriyama, Takaaki and Matsumura, Syo and Nanba, Yusuke and Koyama, Michihisa and Kitagawa, Hiroshi

    Angewandte Chemie   130 ( 17 )   4595 - 4599   2018

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    Publisher：Wiley Online Library  

  • Size effects on rhodium nanoparticles related to hydrogen-storage capability

    Song, Chulho and Yang, Anli and Sakata, Osami and Kumara, LSR and Hiroi, Satoshi and Cui, Yi-Tao and Kusada, Kohei and Kobayashi, Hirokazu and Kitagawa, Hiroshi

    Physical Chemistry Chemical Physics   2018

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    Publisher：Royal Society of Chemistry  

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

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

    Nature communications   9 ( 1 )   510   2018

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    Publisher：Nature Publishing Group  

  • Stacking fault density and bond orientational order of fcc ruthenium nanoparticles

    Seo, O; Sakata, O; Kim, JM; Hiroi, S; Song, C; Kumara, LSR; Ohara, K; Dekura, S; Kusada, K; Kobayashi, H; Kitagawa, H

    APPLIED PHYSICS LETTERS   111 ( 25 )   2017.12   （ ISSN:0003-6951 eISSN:1077-3118 ）

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  • Facile Synthesis of Size-controlled Rh Nanoparticles via Microwave-assisted Alcohol Reduction and Their Catalysis of CO Oxidation

    Nishida, Y; Sato, K; Yamamoto, T; Wu, DS; Kusada, K; Kobayashi, H; Matsumura, S; Kitagawa, H; Nagaoka, K

    CHEMISTRY LETTERS   46 ( 8 )   1254 - 1257   2017.8   （ ISSN:0366-7022 eISSN:1348-0715 ）

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  • Electronic Structure Evolution with Composition Alteration of Rh<i><sub>x</sub></i>Cu<i><sub>y</sub></i> Alloy Nanoparticles

    Palina, N; Sakata, O; Kumara, LSR; Song, C; Sato, K; Nagaoka, K; Komatsu, T; Kobayashi, H; Kusada, K; Kitagawa, H

    SCIENTIFIC REPORTS   7   2017.1   （ ISSN:2045-2322 ）

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  • First-Principles Calculation, Synthesis, and Catalytic Properties of Rh-Cu Alloy Nanoparticles

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

    CHEMISTRY-A EUROPEAN JOURNAL   23 ( 1 )   57 - 60   2017.1   （ ISSN:0947-6539 eISSN:1521-3765 ）

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  • Fine solid solution alloy particles and method for producing same

    Kitagawa, Hiroshi and Kusada, Kohei and Makiura, Rie

    2017.1

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    Publisher：Google Patents  

  • Electronic Structure Evolution with Composition Alteration of Rh x Cu y Alloy Nanoparticles

    Palina, Natalia and Sakata, Osami and Kumara, LSR and Song, Chulho and Sato, Katsutoshi and Nagaoka, Katsutoshi and Komatsu, Tokutaro and Kobayashi, Hirokazu and Kusada, Kohei and Kitagawa, Hiroshi

    Scientific reports   7   41264   2017

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    Publisher：Nature Publishing Group  

  • Stacking fault density and bond orientational order of fcc ruthenium nanoparticles

    Seo, O. and Sakata, O. and Kim, J.M. and Hiroi, S. and Song, C. and Kumara, L.S.R. and Ohara, K. and Dekura, S. and Kusada, K. and Kobayashi, H. and Kitagawa, H.

    Applied Physics Letters   111 ( 25 )   2017   （ ISSN:00036951 ）

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  • Stacking fault density and bond orientational order of fcc ruthenium nanoparticles

    Seo, Okkyun and Sakata, Osami and Kim, Jae Myung and Hiroi, Satoshi and Song, Chulho and Kumara, Loku Singgappulige Rosantha and Ohara, Koji and Dekura, Shun and Kusada, Kohei and Kobayashi, Hirokazu and others

    Applied Physics Letters   111 ( 25 )   253101   2017

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    Publisher：AIP Publishing  

  • First-Principles Calculation, Synthesis, and Catalytic Properties of Rh-Cu Alloy Nanoparticles

    Komatsu, Tokutaro and Kobayashi, Hirokazu and Kusada, Kohei and Kubota, Yoshiki and Takata, Masaki and Yamamoto, Tomokazu and Matsumura, Syo and Sato, Katsutoshi and Nagaoka, Katsutoshi and Kitagawa, Hiroshi

    Chemistry--A European Journal   23 ( 1 )   57 - 60   2017

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    Publisher：Wiley Online Library  

  • Facile Synthesis of Size-controlled Rh Nanoparticles via Microwave-assisted Alcohol Reduction and Their Catalysis of CO Oxidation

    Nishida, Yoshihide and Sato, Katsutoshi and Yamamoto, Tomokazu and Wu, Dongshuang and Kusada, Kohei and Kobayashi, Hirokazu and Matsumura, Syo and Kitagawa, Hiroshi and Nagaoka, Katsutoshi

    Chemistry Letters   46 ( 8 )   1254 - 1257   2017

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    Publisher：The Chemical Society of Japan  

  • Electronic Structure Evolution with Composition Alteration of Rh x Cu y Alloy Nanoparticles

    Palina, N. and Sakata, O. and Kumara, L.S.R. and Song, C. and Sato, K. and Nagaoka, K. and Komatsu, T. and Kobayashi, H. and Kusada, K. and Kitagawa, H.

    Scientific Reports   7   2017   （ ISSN:20452322 ）

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  • Catalyst using Pd-Ru solid solution alloy fine particles

    Kitagawa, Hiroshi and Kusada, Kohei and Nagaoka, Katsutoshi and Sato, Katsutoshi and Kutubi, Md Shahajahan

    2016.9

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    Publisher：Google Patents  

  • Size dependence of structural parameters in fcc and hcp Ru nanoparticles, revealed by Rietveld refinement analysis of high-energy X-ray diffraction data

    Song, C; Sakata, O; Kumara, LSR; Kohara, S; Yang, AL; Kusada, K; Kobayashi, H; Kitagawa, H

    SCIENTIFIC REPORTS   6   2016.8   （ ISSN:2045-2322 ）

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  • A Synthetic Pseudo-Rh: NO<sub>x</sub> Reduction Activity and Electronic Structure of Pd-Ru Solid-solution Alloy Nanoparticles

    Sato, K; Tomonaga, H; Yamamoto, T; Matsumura, S; Zulkifli, NDB; Ishimoto, T; Koyama, M; Kusada, K; Kobayashi, H; Kitagawa, H; Nagaoka, K

    SCIENTIFIC REPORTS   6   2016.6   （ ISSN:2045-2322 ）

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  • Fine solid solution alloy particles and method for producing same

    Kitagawa, Hiroshi and Kusada, Kohei and Makiura, Rie

    2016.3

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    Publisher：Google Patents  

  • A Route for Phase Control in Metal Nanoparticles: A Potential Strategy to Create Advanced Materials

    Kusada, K; Kitagawa, H

    ADVANCED MATERIALS   28 ( 6 )   1129 - 1142   2016.2   （ ISSN:0935-9648 eISSN:1521-4095 ）

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  • A route for phase control in metal nanoparticles: a potential strategy to create advanced materials

    Kusada, Kohei and Kitagawa, Hiroshi

    Advanced Materials   28 ( 6 )   1129 - 1142   2016

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    Publisher：Wiley Online Library  

  • Structural studies of metal nanoparticles using high-energy x-ray diffraction

    Kumara, LSR and Sakata, Osami and Kohara, Shinji and Yang, Anli and Song, Chulho and Kusada, Kohei and Kobayashi, Hirokazu and Kitagawa, Hiroshi

    AIP Conference Proceedings   1741 ( 1 )   050016   2016

  • Size dependence of structural parameters in fcc and hcp Ru nanoparticles, revealed by Rietveld refinement analysis of high-energy X-ray diffraction data

    Song, C. and Sakata, O. and Kumara, L.S.R. and Kohara, S. and Yang, A. and Kusada, K. and Kobayashi, H. and Kitagawa, H.

    Scientific Reports   6   2016   （ ISSN:20452322 ）

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  • Size dependence of structural parameters in fcc and hcp Ru nanoparticles, revealed by Rietveld refinement analysis of high-energy X-ray diffraction data

    Song, Chulho and Sakata, Osami and Kumara, Loku Singgappulige Rosantha and Kohara, Shinji and Yang, Anli and Kusada, Kohei and Kobayashi, Hirokazu and Kitagawa, Hiroshi

    Scientific reports   6   31400   2016

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    Publisher：Nature Publishing Group  

  • Recent progress in the structure control of Pd--Ru bimetallic nanomaterials

    Wu, Dongshuang and Kusada, Kohei and Kitagawa, Hiroshi

    Science and Technology of advanced MaTerialS   17 ( 1 )   583 - 596   2016

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    Publisher：Taylor \& Francis  

  • Origin of the catalytic activity of face-centered-cubic ruthenium nanoparticles determined from an atomic-scale structure

    Kumara, L.S.R. and Sakata, O. and Kohara, S. and Yang, A. and Song, C. and Kusada, K. and Kobayashi, H. and Kitagawa, H.

    Physical Chemistry Chemical Physics   18 ( 44 )   30622 - 30629   2016   （ ISSN:14639076 ）

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  • Origin of the catalytic activity of face-centered-cubic ruthenium nanoparticles determined from an atomic-scale structure

    Kumara, LSR; Sakata, O; Kohara, S; Yang, A; Song, C; Kusada, K; Kobayashi, H; Kitagawa, H

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   18 ( 44 )   30622 - 30629   2016   （ ISSN:1463-9076 eISSN:1463-9084 ）

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  • Origin of the catalytic activity of face-centered-cubic ruthenium nanoparticles determined from an atomic-scale structure

    Kumara, LSR and Sakata, Osami and Kohara, Shinji and Yang, Anli and Song, Chulho and Kusada, Kohei and Kobayashi, Hirokazu and Kitagawa, Hiroshi

    Physical Chemistry Chemical Physics   18 ( 44 )   30622 - 30629   2016

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    Publisher：Royal Society of Chemistry  

  • A Synthetic Pseudo-Rh: NO x Reduction Activity and Electronic Structure of Pd-Ru Solid-solution Alloy Nanoparticles

    Sato, K. and Tomonaga, H. and Yamamoto, T. and Matsumura, S. and Zulkifli, N.D.B. and Ishimoto, T. and Koyama, M. and Kusada, K. and Kobayashi, H. and Kitagawa, H. and Nagaoka, K.

    Scientific Reports   6   2016   （ ISSN:20452322 ）

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  • A Synthetic Pseudo-Rh: NO x Reduction Activity and Electronic Structure of Pd--Ru Solid-solution Alloy Nanoparticles

    Sato, Katsutoshi and Tomonaga, Hiroyuki and Yamamoto, Tomokazu and Matsumura, Syo and Zulkifli, Nor Diana Binti and Ishimoto, Takayoshi and Koyama, Michihisa and Kusada, Kohei and Kobayashi, Hirokazu and Kitagawa, Hiroshi and others

    Scientific reports   6   28265   2016

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    Publisher：Nature Publishing Group  

  • A route for phase control in metal nanoparticles: a potential strategy to create advanced materials

    Kusada, Kohei and Kitagawa, Hiroshi

    Advanced Materials   28 ( 6 )   1129 - 1142   2016

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    Publisher：Wiley Online Library  

  • Dual Lewis Acidic/Basic Pd<sub>0.5</sub>Ru<sub>0.5</sub>-Poly(<i>N</i>-vinyl-2-pyrrolidone) Alloyed Nanoparticle: Outstanding Catalytic Activity and Selectivity in Suzuki-Miyaura Cross-Coupling Reaction

    Kutubi, MS; Sato, K; Wada, K; Yamamoto, T; Matsumura, S; Kusada, K; Kobayashi, H; Kitagawa, H; Nagaoka, K

    CHEMCATCHEM   7 ( 23 )   3887 - 3894   2015.12   （ ISSN:1867-3880 eISSN:1867-3899 ）

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  • Creation of novel solid-solution alloy nanoparticles on the basis of Density-of-States engineering by interelement fusion

    Kobayashi, Hirokazu and Kusada, Kohei and Kitagawa, Hiroshi

    Accounts of chemical research   48 ( 6 )   1551 - 1559   2015

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    Publisher：ACS Publications  

  • Hybrid materials of Ni NP@MOF prepared by a simple synthetic method

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

    CHEMICAL COMMUNICATIONS   51 ( 62 )   12463 - 12466   2015   （ ISSN:1359-7345 eISSN:1364-548X ）

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  • Hybrid materials of Ni NP@ MOF prepared by a simple synthetic method

    Mukoyoshi, Megumi and Kobayashi, Hirokazu and Kusada, Kohei and Hayashi, Mikihiro and Yamada, Teppei and Maesato, Mitsuhiko and Taylor, Jared M and Kubota, Yoshiki and Kato, Kenichi and Takata, Masaki and others

    Chemical Communications   51 ( 62 )   12463 - 12466   2015

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    Publisher：Royal Society of Chemistry  

  • Dual Lewis Acidic/Basic Pd0. 5Ru0. 5--Poly (N-vinyl-2-pyrrolidone) Alloyed Nanoparticle: Outstanding Catalytic Activity and Selectivity in Suzuki--Miyaura Cross-Coupling Reaction

    Kutubi, Md and Sato, Katsutoshi and Wada, Kenji and Yamamoto, Tomokazu and Matsumura, Syo and Kusada, Kohei and Kobayashi, Hirokazu and Kitagawa, Hiroshi and Nagaoka, Katsutoshi and others

    ChemCatChem   7 ( 23 )   3887 - 3894   2015

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    Publisher：Wiley Online Library  

  • Ruthenium nanoparticles with essentially face-centered cubic structure and method for producing the same

    Kitagawa, Hiroshi and Kusada, Kohei

    2014.12

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    Publisher：Google Patents  

  • 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

    Kusada, K; Kobayashi, H; Ikeda, R; Kubota, Y; Takata, M; Toh, S; Yamamoto, T; Matsumura, S; Sumi, N; Sato, K; Nagaoka, K; Kitagawa, H

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   136 ( 5 )   1864 - 1871   2014.2   （ ISSN:0002-7863 eISSN:1520-5126 ）

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  • An ordered bcc CuPd nanoalloy synthesised <i>via</i> the thermal decomposition of Pd nanoparticles covered with a metal-organic framework under hydrogen gas

    Li, G; Kobayashi, H; Kusada, K; Taylor, JM; Kubota, Y; Kato, K; Takata, M; Yamamoto, T; Matsumura, S; Kitagawa, H

    CHEMICAL COMMUNICATIONS   50 ( 89 )   13750 - 13753   2014   （ ISSN:1359-7345 eISSN:1364-548X ）

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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

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

    Journal of the American Chemical Society   136 ( 5 )   1864 - 1871   2014

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    Publisher：ACS Publications  

  • Creation of New Metal Nanoparticles and their Hydrogen-Storage and Catalytic Properties

    Kusada, K

    CREATION OF NEW METAL NANOPARTICLES AND THEIR HYDROGEN-STORAGE AND CATALYTIC PROPERTIES   1 - 78   2014   （ ISSN:2190-5053 ISBN:978-4-431-55086-0 ）

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  • An ordered bcc CuPd nanoalloy synthesised via the thermal decomposition of Pd nanoparticles covered with a metal--organic framework under hydrogen gas

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

    Chemical Communications   50 ( 89 )   13750 - 13753   2014

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    Publisher：Royal Society of Chemistry  

  • Discovery of Face-Centered-Cubic Ruthenium Nanoparticles: Facile Size-Controlled Synthesis Using the Chemical Reduction Method

    Kusada, K; Kobayashi, H; Yamamoto, T; Matsumura, S; Naoya, S; Sato, K; Nagaoka, K; Kubota, Y; Kitagawa, H

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   135 ( 15 )   5493 - 5496   2013.4   （ ISSN:0002-7863 ）

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  • Discovery of face-centered-cubic ruthenium nanoparticles: facile size-controlled synthesis using the chemical reduction method

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

    Journal of the American Chemical Society   135 ( 15 )   5493 - 5496   2013

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    Publisher：ACS Publications  

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

    Kusada, K; Yamauchi, M; Kobayashi, H; Kitagawa, H; Kubota, Y

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   132 ( 45 )   15896 - 15898   2010.11   （ ISSN:0002-7863 eISSN:1520-5126 ）

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  • Hydrogen-storage properties of solid-solution alloys of immiscible neighboring elements with Pd

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

    Journal of the American Chemical Society   132 ( 45 )   15896 - 15898   2010

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    Publisher：ACS Publications  

  • Unraveling Element-Selective Local Structures in Multielement Alloy Nanoparticles with EXAFS

    Masashi Nakamura, Dongshuang Wu, Megumi Mukoyoshi, Kohei Kusada, Hiroyuki Hayashi, Takaaki Toriyama, Tomokazu Yamamoto, Yasukazu Murakami, Hirotaka Ashitani, Shogo Kawaguchi, Toshiaki Ina, Osami Sakata, Yoshiki Kubota, Isao Tanaka, Hiroshi Kitagawa

    ACS Nanoscience Au   5 ( 3 )   196 - 207   2025.6   （ eISSN:2694-2496 ）

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ACS Nanoscience Au  

    We demonstrate physically consistent and interpretable extended X-ray absorption fine structure (EXAFS) curve-fitting analyses for estimating element-selective local structures in multielement alloy nanoparticles (MEA NPs). The difficulty in analyzing multielement systems originates from the too large number of independent structural parameters to fit, far exceeding the information content of the typical experimental data. Herein, this challenge is overcome by simultaneously fitting multiple data at different absorption edges and temperatures while imposing constraints based on a physically reasonable model. Another advantage of our approach is interpretability; the individual contributions of the constituent elements to the static and dynamic structures are explicitly estimated as atomic radii and Einstein temperatures. This method is used to analyze MEA NPs composed of platinum-group metals and p-block metals, which have contrasting properties, including atomic radii, melting points, and electronegativities. The results indicate that the local structures reflect the intrinsic nature of the elements and are also influenced by the interactions among them. The local structures around the p-block metals in the MEA NPs are shown to be distinctively modulated compared with those in the corresponding monometals, which is attributed to the electronic interaction with the platinum-group metals based on ab initio calculations. Our method is expected to facilitate the experimental characterization of these structurally complicated nanomaterials, which have been analyzed relying on calculations, yielding more precise pictures of real systems for investigating structure-property relationships.

    DOI： 10.1021/acsnanoscienceau.5c00013

    Web of Science

    Scopus

    PubMed

  • Phase Control in Monometallic and Alloy Nanomaterials

    Kohei Kusada, Hiroshi Kitagawa

    Chemical Reviews   125 ( 2 )   599 - 659   2025.1   （ ISSN:0009-2665 eISSN:1520-6890 ）

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    Publishing type：Research paper (scientific journal)   Publisher：Chemical Reviews  

    Metal nanomaterials with unconventional phases have been recently developed with a variety of methods and exhibit novel and attractive properties such as high activities for various catalytic reactions and magnetic properties. In this review, we discuss the progress and the trends in strategies for synthesis, crystal structure, and properties of phase-controlled metal nanomaterials in terms of elements and the combination of alloys. We begin with a brief introduction of the anomalous phase behavior derived from the nanosize effect and general crystal structures observed in metal nanomaterials. Then, phase control in monometallic nanomaterials with respect to each element and alloy nanomaterials classified into three types based on their crystal structures is discussed. In the end, all the content introduced in this review is summarized, and challenges for advanced phase control are discussed.

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  • Platinum‐Group Metal High‐Entropy Selenides for the Hydrogen Evolution Reaction

    Xiaohui Deng, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Yasukazu Murakami, Jo‐Chi Tseng, Hiroki Yamada, Osami Sakata, Hirotaka Ashitani, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Angewandte Chemie International Edition   64 ( 2 )   e202414786   2025.1   （ ISSN:1433-7851 eISSN:1521-3773 ）

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    The selenides of platinum-group metals (PGMs) are emerging as promising catalysts for diverse electrochemical reactions. To date, most studies have focused on single metal or bimetallic systems, whereas the preparation of a high-entropy (HE) selenide consisting of five or more PGM elements holds the promise to further enhance catalytic performance by introducing abundant active sites with various local coordination environments and electronic structures. Herein, we report for the first time the synthesis of PGM-based HE-Selenide (HE-Se) nanoparticles with a unique amorphous structure. The atomic metal–Se coordination and the presence of short-range order were thoroughly revealed. It is further shown that the amorphous HE-Se can be facilely transformed into a single-phase crystalline HE-Se with a cubic structure by thermal annealing. Catalytically, the amorphous HE-Se showed better acidic hydrogen evolution activity over monometallic PGM-based selenides and the crystalline counterpart, demonstrating the advantages of high-entropy configuration and amorphous structure. Our findings may pave the way toward the synthesis and property exploration of amorphous PGM-based selenides with tunable compositions.

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  • Platinum‐Group Metal High‐Entropy Selenides for the Hydrogen Evolution Reaction

    Xiaohui Deng, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Yasukazu Murakami, Jo‐Chi Tseng, Hiroki Yamada, Osami Sakata, Hirotaka Ashitani, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

    Angewandte Chemie   2025.1

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    DOI： 10.1002/ange.202414786

  • Ultra-high-entropy alloy nanoparticles: beyond five components

    Julien Mahin, Kohei Kusada, Hiroshi Kitagawa

    Inorganic Chemistry Frontiers   2025   （ ISSN:2052-1553 ）

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    High-entropy alloy nanoparticles (HEANPs) composed of five or more elements hold great promise for important applications, including catalysis for critical energy transformations. Although initial research focused on materials that contain five components given the challenge of alloying many elements with different properties, novel strategies developed in recent years have greatly extended the compositional space, number and diversity of elements in these alloys, thereby opening a new realm of possibilities. In this review, we focus on reports of HEANPs containing six or more components. To this end, we reviewed the theoretical framework for describing these novel high-entropy alloy materials; various synthetic methods devised to produce these materials; and their various applications, including electrocatalysis, thermocatalysis, and photothermal conversion. We conclude by providing an overview of the challenges and perspectives for future research and guidance for the progression of the field.

    DOI： 10.1039/D5QI00884K

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  • Atomic behaviors in PdRu solid-solution nanoparticles on CeO2-ZrO2 support for the three-way catalytic reaction

    Okkyun Seo, Akhil Tayal, Jaemyung Kim, Kohei Kusada, Tomokazu Yamamoto, Jiayi Tang, Satoshi Hiroi, Chulho Song, Katsutoshi Sato, Katsutoshi Nagaoka, Masaaki Haneda, Kazuo Kato, Syo Matsumura, Hiroshi Kitagawa, Osami Sakata

    Materials Today Catalysis   7   100078 - 100078   2024.12   （ ISSN:2949-754X ）

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    Understanding the behavior of noble-metal catalysts is a key point of catalysis research aimed at reducing the environmental and economic costs associated with the increased use of automobiles. In this study, the atomic-behaviors of Ru and Pd atoms in PdRu solid-solution nanoparticles (NPs) supported on CeO<inf>2</inf>-ZrO<inf>2</inf> (CZ) as a Rh-free three-way catalyst in a modeled three-way catalytic reaction (TWCR) were elucidated using a gas conversion analysis, transmission electron microscopy, and in-situ X-ray absorption fine structure spectroscopy. We found that the PdRu NPs enlarged by the annealing effect separated a smaller grain size with the Pd-rich and Ru-rich phase under TWCR. Most of the oxidation and reduction reactions under the modeled TWCR occurred on the Ru. However, the Pd metals acted as a major role of the reduction of NO gas and oxidation of CO and C<inf>3</inf>H<inf>6</inf> gas. Ru atoms just is a minor role during the modeled TWCR. This study demonstrates the potential of PdRu NPs as a three-way catalyst and reveals the atomic-behavior and catalytic role under the modeled TWCR.

    DOI： 10.1016/j.mtcata.2024.100078

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  • Extended Unit Cell Model Employing Two Vectors for Crystal Structure Analysis in IrPd Nanoparticles for Catalysis

    Hirotaka Ashitani, Shogo Kawaguchi, Kohei Kusada, Yusuke Nanba, Susan Meñez Aspera, Michihisa Koyama, Naomi Kawamura, Hiroshi Kitagawa, Osami Sakata

    ACS Applied Nano Materials   7 ( 20 )   23466 - 23473   2024.10   （ eISSN:2574-0970 ）

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    Crystal structure is closely related to the function of materials, and understanding of crystal structure is essential not only in the scientific field but also in the industrial field for applications of materials. We introduce the extended unit cell (EUC) model with two vectors to effectively represent complex nanoparticle structures such as twinning and multiple twinning. This model overcomes the limitations of conventional single- and two-phase analyses in capturing such structures. Furthermore, the local atomic distribution in Ir-Pd bimetallic NPs was investigated in detail, and it was found that Ir and Pd are at sites represented by a single vector while suggesting the localized presence of Ir at sites where the vector changes. Such a detailed observation of local atomic distribution is difficult to represent by conventional two-phase analysis, highlighting the great advantage of our proposed EUC model. This study not only aims to enhance the understanding of nanoparticle structures and their properties for catalysis but also proposes a methodology that significantly reduces computational costs by simplifying the representation of complex structures. It is particularly suitable for catalytic applications requiring precise structural control.

    DOI： 10.1021/acsanm.4c02368

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  • Author Correction: Localized thermal levering events drive spontaneous kinetic oscillations during CO oxidation on Rh/Al2O3

    Donato Decarolis, Monik Panchal, Matthew Quesne, Khaled Mohammed, Shaojun Xu, Mark Isaacs, Adam H. Clark, Luke L. Keenan, Takuo Wakisaka, Kohei Kusada, Hiroshi Kitagawa, C. Richard A. Catlow, Emma K. Gibson, Alexandre Goguet, Peter P. Wells

    Nature Catalysis   7 ( 11 )   2024.10   （ ISSN:2520-1158 ）

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    Correction to: Nature Catalysishttps://doi.org/10.1038/s41929-024-01181-w, published online 2 July 2024. For clarification we have rescaled Fig. 5. The new scaling better reflects minor energy differences between close lying intermediate species, where in the original figure, the positions of steps did not reflect the written values. Additionally, benchmarked values for the chosen K points are available at the University of Southampton repository with the identifier https://doi.org/10.5258/SOTON/D3028. We have taken this opportunity to also add benchmarking data for cut-off values and surface work functions (Φ) to the same document. Additionally, refs. 49 and 50 were inverted in the original article and have now been corrected. These changes have been made to the HTML and PDF versions of the article.

    DOI： 10.1038/s41929-024-01240-2

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  • Atomic-Scale Behavior of Perovskite-Supported Ir–Pd–Ru Nanoparticles under Redox Atmospheres

    Xuan Quy Tran, Tomokazu Yamamoto, Kohei Aso, Satoru Yoshioka, Kohei Kusada, Hiroshi Kitagawa, Masaaki Haneda, Youichirou Kawami, Syo Matsumura

    Nano Letters   24 ( 35 )   11108 - 11115   2024.9   （ ISSN:1530-6984 eISSN:1530-6992 ）

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    An advanced materials solution utilizing the concept of “smart catalysts” could be a game changer for today’s automotive emission control technology, enabling the efficient use of precious metals via their two-way switching between metallic nanoparticle forms and ionic states in the host perovskite lattice as a result of the cyclical oxidizing/reducing atmospheres. However, direct evidence for such processes remains scarce; therefore, the underlying mechanism has been an unsettled debate. Here, we use advanced scanning transmission electron microscopy to reveal the atomic-scale behaviors for a LaFe<inf>0.95</inf>Pd<inf>0.05</inf>O<inf>3</inf>-supported Ir-Pd-Ru nanocatalyst under fluctuating redox conditions, thereby proving the reversible dissolution/exsolution for Ir and Ru but with a limited occurrence for Pd. Despite such selective dissolution during oxidation, all three elements remain cooperatively alloyed in the subsequent reduction, which is a key factor in preserving the catalytic activity of the ternary nanoalloy while displaying its self-regenerating functionality and control of particle agglomeration.

    DOI： 10.1021/acs.nanolett.4c03356

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  • Synthesis of Pd–Pt–P amorphous nanoparticles

    Kenta Ikeda, Megumi Mukoyoshi, Kohei Kusada, Tomokazu Yamamoto, Yasukazu Murakami, Hiroshi Kitagawa

    Chemistry Letters   53 ( 8 )   2024.7   （ ISSN:0366-7022 eISSN:1348-0715 ）

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    Abstract

    Amorphous materials are very attractive materials because of their unique properties, including high corrosion resistance and catalytic activity. Creating such materials on a nanoscale is very effective in maximizing their performance. However, it is difficult to synthesize amorphous nanomaterials by conventional rapid cooling methods, commonly used for bulk amorphous materials. Therefore, there are not as many reports about amorphous nanomaterials as bulk materials. Herein we report the first synthesis of Pd–Pt–P amorphous nanoparticles by a 2-step synthesis method. They were also characterized.

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  • Localized thermal levering events drive spontaneous kinetic oscillations during CO oxidation on Rh/Al2O3

    Donato Decarolis, Monik Panchal, Matthew Quesne, Khaled Mohammed, Shaojun Xu, Mark Isaacs, Adam H. Clark, Luke L. Keenan, Takuo Wakisaka, Kohei Kusada, Hiroshi Kitagawa, C. Richard A. Catlow, Emma K. Gibson, Alexandre Goguet, Peter P. Wells

    Nature Catalysis   7 ( 7 )   829 - 837   2024.7   （ ISSN:2520-1158 ）

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    Unravelling kinetic oscillations, which arise spontaneously during catalysis, has been a challenge for decades but is important not only to understand these complex phenomena but also to achieve increased activity. Here we show, through temporally and spatially resolved operando analysis, that CO oxidation over Rh/Al<inf>2</inf>O<inf>3</inf> involves a series of thermal levering events—CO oxidation, Boudouard reaction and carbon combustion—that drive oscillatory CO<inf>2</inf> formation. This catalytic sequence relies on harnessing localized temperature episodes at the nanoparticle level as an efficient means to drive reactions in situations in which the macroscopic conditions are unfavourable for catalysis. This insight provides a new basis for coupling thermal events at the nanoscale for efficient harvesting of energy and enhanced catalyst technologies. (Figure presented.)

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  • Single-walled carbon nanotube synthesis with RuRhPdIrPt high entropy alloy catalysts

    Shu Matsuoka, Kamal Prasad Sharma, Takahiro Saida, Kohei Kusada, Hiroshi Kitagawa, Takahiro Maruyama

    Chemical Physics Letters   841   2024.4   （ ISSN:0009-2614 eISSN:1873-4448 ）

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    Using high-entropy alloy nanoparticles (HEA NPs) composed of five platinum-group metals (5PGM), Ru, Rh, Pd, Ir, and Pt, as catalysts, we succeeded in growing single-walled carbon nanotubes (SWCNTs) via chemical vapor deposition (CVD). After CVD growth with C<inf>2</inf>H<inf>2</inf> feedstock at 750 ℃ for 10 min, high-density SWCNTs were grown from 5PGM HEA NPs. The diameters of most SWCNTs were in the range of 0.83–1.1 nm, exhibiting the growth of small-diameter SWCNTs. Compared with monometal PGM catalysts, the SWCNT yield with the 5PGM HEA NP catalysts was much higher and was compatible even with those with Fe and Co.

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  • Facilely Fabricated Zero-Bias Silicon-Based Plasmonic Photodetector in the Near-Infrared Region with a Schottky Barrier Properly Controlled by Nanoalloys International journal

    Shinya Okamoto, Kohei Kusada, Yuki Nomura, Eiji Takeda, Yasuhisa Inada, Kazuya Hisada, Satoshi Anada, Kazuo Yamamoto, Taku Hirasawa, Hiroshi Kitagawa

    ACS Applied Materials & Interfaces   16 ( 7 )   8984 - 8992   2024.2   （ ISSN:1944-8244 eISSN:1944-8252 ）

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    Plasmonic Schottky devices have attracted considerable attention for use in practical applications based on photoelectric conversion, because they enable light to be harvested below the bandgap of semiconductors. In particular, silicon-based (Si) plasmonic Schottky devices have great potential for useful photodetection in the near-infrared region. However, the internal quantum efficiency (IQE) values of previously reported devices are low because the Schottky barrier is excessively high. Here, we are the first to develop AuAg nanoalloy-n-type Si plasmonic Schottky devices by cathodic arc plasma deposition. Interestingly, it is found that a novel nanostructure, which leads to the improvement of responsivities, is formed. Moreover, these plasmonic nanostructures can be fabricated in only ∼1 min. The fabricated AuAg nanoparticle-film structure enables proper control of the Schottky barrier height and increases the area of the Schottky interface for electron transfer. As a result, the considerably enhanced IQE of our device at a telecommunication wavelength of 1310 nm (1550 nm) without external bias is 4.6 (6.5) times higher than those in previous reports, and these responsivities are a record high. This approach can be applied to realize efficient photodetection in the NIR region and extend the use of light below the bandgap of semiconductors. This paves the way for future application advancements in a variety of fields, including photodetection, imaging, photovoltaics, and photochemistry.

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  • Breakdown of Kubo relation in Pt-Cu nanoparticles

    Shunsaku Kitagawa, Yudai Kinoshita, Kenji Ishida, Kouhei Kusada, Hiroshi Kitagawa

    Physical Review B   109 ( 4 )   2024.1   （ ISSN:2469-9950 eISSN:2469-9969 ）

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    Nanoparticles were predicted to exhibit unique physical properties due to quantum size effects, but their identification remains difficult. According to Kubo's theory, the gap size is inversely correlated with both the density of states at the Fermi energy and the number of atoms in the particle. Previously, we confirmed that the particle size and magnetic field dependence of NMR anomaly temperature is consistent with the estimated "Kubo"gap. Here, we investigated the density-of-states dependence in the Pt1-xCux nanoparticles. While an enhancement of nuclear spin-lattice relaxation rate 1/T1 at low temperatures was clearly observed for the Pt-rich nanoparticles, such behavior was abruptly suppressed in the Cu-rich nanoparticles. Furthermore, the NMR anomaly temperature is nearly unchanged with varying the density of states. Our findings indicate that quantum size effect contains more profound physics than just the ones predicted by Kubo.

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  • 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   2024.1   （ 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.

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  • 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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    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@SnO<inf>x</inf> 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 Ru<inf>0.94</inf>Sn<inf>0.06</inf> NPs/C and Ru<inf>0.87</inf>Sn<inf>0.13</inf> NPs/C to achieve a current density of 10 mA cm<sup>−2</sup> 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 H<inf>ads</inf> effectively, and thus enable the RuSn solid-solution alloy NPs to exhibit excellent HER catalytic properties.

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

    Zhou, X., Mukoyoshi, M., Kusada, K., Yamamoto, T., Toriyama, T., Murakami, Y., Ina, T., Kawaguchi, S., Kubota, Y., Kitagawa, H.

    ACS Materials Letters   6 ( 2 )   353 - 359   2024   （ ISSN:26394979 eISSN:2639-4979 ）

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    We report the synthesis of novel RuIn solid-solution alloy nanoparticles (NPs) via the electrochemical cleaning of RuIn@InO<inf>x</inf> NPs. By alloying In to Ru, the RuIn NPs exhibited enhanced hydrogen evolution reaction (HER) activity compared with monometallic face-centered cubic (fcc) Ru NPs. Furthermore, the HER activity of RuIn NPs was comparable to that of commercial Pt catalysts. At a current density of 10 mA cm<sup>-2</sup>, RuIn NPs displayed a lower overpotential of 30.7 mV compared to monometallic fcc Ru NPs (57.8 mV) and commercial Pt NPs/C (34.1 mV). X-ray photoelectron spectroscopy and X-ray absorption near edge structure analysis revealed charge transfer from In to Ru in RuIn NPs. The results indicate that the alloying of In with Ru leads to beneficial intermetallic charge transfer, which efficiently modulates the desorption energy barrier to intermediate H* and enhances the intrinsic HER performance of monometallic fcc Ru NPs.

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  • Phase control of solid-solution RuIn nanoparticles and their catalytic properties

    Xin Zhou, Megumi Mukoyoshi, Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Yasukazu Murakami, Hiroshi Kitagawa

    Nanoscale   16 ( 19 )   9311 - 9316   2024   （ ISSN:2040-3364 eISSN:2040-3372 ）

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    The properties of solids could be largely affected by their crystal structures. We achieved, for the first time, the phase control of solid-solution RuIn nanoparticles (NPs) from face-centred cubic (fcc) to hexagonal close-packed (hcp) crystal structures by hydrogen heat treatment. The effect of the crystal structure of RuIn alloy NPs on the catalytic performance in the hydrogen evolution reaction (HER) was also investigated. In the hcp RuIn NPs, enhanced HER catalytic performance was observed compared to the fcc RuIn NPs and monometallic Ru NPs. The intrinsic electronic structures of the NPs were investigated by valence-band X-ray photoelectron spectroscopy (VB-XPS). The d-band centre of hcp RuIn NPs obtained from VB-XPS was deeper than that of fcc RuIn NPs and monometallic Ru NPs, which is considered to enable the hcp RuIn NPs to exhibit enhanced HER catalytic performance.

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

    Hanabata, S; Kusada, K; Yamamoto, T; Toriyama, T; Matsumura, S; Kawaguchi, S; Kubota, Y; Nishida, Y; Haneda, M; Kitagawa, H

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   146 ( 1 )   181 - 186   2023.12   （ ISSN:0002-7863 eISSN:1520-5126 ）

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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.

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

    Okazoe, S; Kusada, K; Yoshida, Y; Maesato, M; Yamamoto, T; Toriyama, T; Matsumura, S; Kawaguchi, S; Kubota, Y; Nanba, Y; Aspera, SM; Koyama, M; Kitagawa, H

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   145 ( 44 )   24005 - 24011   2023.10   （ ISSN:0002-7863 eISSN:1520-5126 ）

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    Technetium (Tc), atomic number 43, is an element that humans cannot freely use even in the 21st century because Tc is radioactive and has no stable isotope. In this report, we present molybdenum-ruthenium-carbon solid-solution alloy (MoxRu1-xCy) nanoparticles (NPs) that are expected to have an electronic structure similar to that of technetium carbide (TcCy). MoxRu1-xCy NPs were synthesized by annealing under a helium/hydrogen atmosphere following thermal decomposition of metal precursors. The obtained NPs had a solid-solution structure in the whole composition range. MoxRu1-xCy with a cubic structure (down to 30 atom % Mo in the metal ratio) showed a superconducting state, and the transition temperature (Tc) increased with increasing Mo composition. The continuous change in Tc across that of TcCy indicates the continuous control of the electronic structure by solid-solution alloying, leading to pseudo-TcCy. Density functional theory calculations indicated that the synthesized Mo0.53Ru0.47C0.41 has a similar electronic structure to TcC0.41

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

    Nakamura, M; Wu, DS; Mukoyoshi, M; Kusada, K; Toriyama, T; Yamamoto, T; Matsumura, S; Murakami, Y; Kawaguchi, S; Kubota, Y; Kitagawa, H

    CHEMICAL COMMUNICATIONS   59 ( 62 )   9485 - 9488   2023.8   （ ISSN:1359-7345 eISSN:1364-548X ）

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    We first report the synthesis of B2-structured indium-platinum group metal high-entropy intermetallic nanoparticles (In-PGM HEI NPs). The synthesis was achieved by a wet-chemistry method and subsequent heat treatment. The crystal structure of these NPs is unique in the coexistence of completely orderly arranged indium and disorderly arranged PGMs.

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

    Minamihara, H; Kusada, K; Yamamoto, T; Toriyama, T; Murakami, Y; Matsumura, S; Kumara, LSR; Sakata, O; Kawaguchi, S; Kubota, Y; Seo, O; Yasuno, S; Kitagawa, H

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   145 ( 31 )   17136 - 17142   2023.7   （ ISSN:0002-7863 eISSN:1520-5126 ）

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    Multielement alloy nanoparticles have attracted much attention due to their attractive catalytic properties derived from the multiple interactions of adjacent multielement atoms. However, mixing multiple elements in ultrasmall nanoparticles from a wide range of elements on the periodic table is still challenging because the elements have different properties and miscibility. Herein, we developed a benchtop 4-way flow reactor for chemical synthesis of ultra-multielement alloy (UMEA) nanoparticles composed of d-block and p-block elements. BiCoCuFeGaInIrNiPdPtRhRuSbSnTi 15-element alloy nanoparticles composed of group IV to XV elements were synthesized by sequential injection of metal precursors using the reactor. This methodology realized the formation of UMEA nanoparticles at low temperature (66 °C), resulting in a 1.9 nm ultrasmall average particle size. The UMEA nanoparticles have high durability and activity for electrochemical alcohol oxidation reactions and high tolerance to CO poisoning. These results suggest that the multiple interactions of UMEA efficiently promote the multistep alcohol oxidation reaction.

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  • Persistent Homology and Bond Orientational Order in Ir–Cu Solid-Solution Alloy Nanoparticles: Implications for Electrocatalysts

    Loku Singgappulige Rosantha Kumara, Okkyun Seo, Jaemyung Kim, Fenglong Wang, Yanna Chen, Ibrahima Gueye, Chulho Song, Koji Ohara, Kohei Kusada, Hiroshi Kitagawa, Osami Sakata

    ACS Applied Nano Materials   6 ( 18 )   16653 - 16661   2023   （ ISSN:25740970 eISSN:2574-0970 ）

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    Solid-solution alloy nanoparticles (NPs) comprising a noble metal and a transition metal, which are almost immiscible in the bulk phase, are promising cost-effective electrocatalysts for oxygen-evolution and oxygen-reduction reactions. However, the crystal structures of these NPs cannot be determined by the usual crystallographic techniques. Instead, high-energy X-ray diffraction structure factors were fitted by using the reverse Monte Carlo (RMC) method. Three-dimensional (3D) configuration models of Ir<inf>x</inf>Cu<inf>1-x</inf> solid-solution alloy NPs indicated spherical, highly disordered atomic configurations, with random mixing of Cu and Ir atoms. 3D local structures of the NPs were investigated via persistence diagrams (PDs) and bond orientational orders (BOOs). PDs of RMC NP models exhibited a broad distribution with very small “death” values along the diagonal and no vertical profile, which would indicate network formation. PDs of Ir<inf>x</inf>Cu<inf>1-x</inf> NPs also confirmed the absence of cavities or voids. The q<inf>4</inf> and q<inf>6</inf> BOO parameters for Ir and Cu in the RMC NP models had a broad distribution, unlike that for ideal NP models. The BOO parameter P<inf>BOO</inf> provided compelling evidence for the contribution of the local structure and the lower coordination numbers. This enabled the availability of active sites on the Ir<inf>x</inf>Cu<inf>1-x</inf> NP surface, enhancing the oxygen-evolution reaction.

    DOI： 10.1021/acsanm.3c02860

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

    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   2022.7

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    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

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  • The Effect of Ru Precursor and Support on the Hydrogenation of Aromatic Aldehydes/Ketones to Alcohols

    Chandan Chaudhari, Katsutoshi Sato, Shin-ichiro Miyahara, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Kohei Kusuda, Hiroshi Kitagawa, Katsutoshi Nagaoka

    CHEMCATCHEM   14 ( 16 )   2022.6   （ ISSN:1867-3880 eISSN:1867-3899 ）

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    DOI： 10.1002/cctc.202200241

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

    Maruta, Y; Kusada, K; Wu, DS; Yamamoto, T; Toriyama, T; Matsumura, S; Seo, O; Yasuno, S; Kawaguchi, S; Sakata, O; Kubota, Y; Kitagawa, H

    CHEMICAL COMMUNICATIONS   58 ( 44 )   6421 - 6424   2022.5   （ ISSN:1359-7345 eISSN:1364-548X ）

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    Platinum-group-metal quinary RuRhPdIrPt alloy nanoparticles were synthesised with compositions slightly away from equimolar, and their crystal and electronic structures were investigated. Their lattice constant changed linearly with composition, while the d-band centre changed nonlinearly. Their catalytic activities for the hydrogen evolution reaction were not correlated with their d-band centre.

    DOI： 10.1039/d2cc01866g

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  • Enhancing Hydrogen Storage Capacity of Pd Nanoparticles by Sandwiching between Inorganic Nanosheets

    Kevin Ament, Hirokazu Kobayashi, Kohei Kusada, Josef Breu, Hiroshi Kitagawa

    Zeitschrift fur Anorganische und Allgemeine Chemie   648 ( 10 )   2022.5   （ ISSN:0044-2313 eISSN:1521-3749 ）

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    DOI： 10.1002/zaac.202100370

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  • Enhancing Hydrogen Storage Capacity of Pd Nanoparticles by Sandwiching between Inorganic Nanosheets

    Kevin Ament, Hirokazu Kobayashi, Kohei Kusada, Josef Breu, Hiroshi Kitagawa

    ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE   648 ( 10 )   2022.5   （ ISSN:0044-2313 eISSN:1521-3749 ）

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    DOI： 10.1002/zaac.202100370

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

    Zhang, Q; Kusada, K; Wu, DS; Yamamoto, T; Toriyama, T; Matsumura, S; Kawaguchi, S; Kubota, Y; Kitagawa, H

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   144 ( 9 )   4224 - 4232   2022.3   （ ISSN:0002-7863 eISSN:1520-5126 ）

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    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

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

    Wu, DS; Kusada, K; Nanba, Y; Koyama, M; Yamamoto, T; Toriyama, T; Matsumura, S; Seo, O; Gueye, I; Kim, J; Kumara, LSR; Sakata, O; Kawaguchi, S; Kubota, Y; Kitagawa, H

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   144 ( 8 )   3365 - 3369   2022.3   （ ISSN:0002-7863 eISSN:1520-5126 ）

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    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

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  • Quantitative Characterization of the Thermally Driven Alloying State in Ternary Ir-Pd-Ru Nanoparticles

    Tran, XQ; Aso, K; Yamamoto, T; Yang, WH; Kono, Y; Kusada, K; Wu, DS; Kitagawa, H; Matsumura, S

    ACS NANO   16 ( 1 )   1612 - 1624   2022.1   （ ISSN:1936-0851 eISSN:1936-086X ）

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    Compositional and structural arrangements of constituent elements, especially those at the surface and near-surface layers, are known to greatly influence the catalytic performance of alloyed nanoparticles (NPs). Although much research effort often focuses on the ability to tailor these important aspects in the design stage, their stability under realistic operating conditions remains a major technical challenge. Here, the compositional stability and associated structural evolution of a ternary iridium-palladium-ruthenium (Ir-Pd-Ru) nanoalloy at elevated temperatures have been studied using interrupted in situ scanning transmission electron microscopy and theoretical modeling. The results are based on a combinatory approach of statistical sampling at the sub-nanometer scale for large groups of NPs as well as tracking individual NPs. We find that the solid solution Ir-Pd-Ru NPs (?5.6 nm) evolved into a Pd-enriched shell supported on an alloyed Ir-Ru-rich core, most notably when the temperature exceeds 500 °C, concurrently with the development of expansive atomic strain in the outer surface and subsurface layers with respect to the core regions. Theoretically, we identify the weak interatomic bonds, low surface energy, and large atomic sizes associated with Pd as the key factors responsible for such observed features.

    DOI： 10.1021/acsnano.1c10414

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

    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   （ ISSN:26942461 eISSN:2694-2461 ）

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    The crystal structure, which intrinsically affects the properties of solids, is determined by the constituent elements and composition of solids. Therefore, it cannot be easily controlled beyond the phase diagram because of thermodynamic limitations. Here, we demonstrate the first example of controlling the crystal structures of a solid-solution nanoparticle (NP) entirely without changing its composition and size. We synthesized face-centered cubic (fcc) or hexagonal close-packed (hcp) structured Pd x Ru1-x NPs (x = 0.4, 0.5, and 0.6), although they cannot be synthesized as bulk materials. Crystal-structure control greatly improves the catalytic properties; that is, the hcp-Pd x Ru1-x NPs exceed their fcc counterparts toward the oxygen evolution reaction (OER) in corrosive acid. These NPs only require an overpotential (η) of 200 mV at 10 mA cm-2, can maintain the activity for more than 20 h, greatly outperforming the fcc-Pd0.4Ru0.6 NPs (η = 280 mV, 9 min), and are among the most efficient OER catalysts reported. Synchrotron X-ray-based spectroscopy, atomic-resolution electron microscopy, and density functional theory (DFT) calculations suggest that the enhanced OER performance of hcp-PdRu originates from the high stability against oxidative dissolution.

    DOI： 10.1021/acsmaterialsau.1c00048

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  • Localised Thermal Levering Events Drive Spontaneous Kinetic Oscillations in Catalysis

    Donato Decarolis, Monik Panchal, Matthew Quesne, Khaled Mohammed, Shaojun Xu, Mark Isaacs, Luke Keenan, Takuo Wakisaka, Kohei Kusada, Hiroshi Kitagawa, C. Richard Catlow, Emma Gibson, Alexandre Goguet, Peter Wells

    Research Square   2022

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  • Erratum: On the electronic structure and hydrogen evolution reaction activity of platinum group metal-based high-entropy-alloy nanoparticles (Chem. Sci. (2020) 11 (12731-12736) DOI: 10.1039/D0SC02351E)

    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   2021.5   （ ISSN:2041-6520 eISSN:2041-6539 ）

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    DOI： 10.1039/d1sc90104d

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  • On the electronic structure and hydrogen evolution reaction activity of platinum group metal-based high-entropy-alloy nanoparticles (vol 11, pg 12731, 2020) International journal

    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   2021.5   （ ISSN:2041-6520 eISSN:2041-6539 ）

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    DOI： 10.1039/d1sc90104d

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  • Efficient overall water splitting in acid with anisotropic metal nanosheets International journal

    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 )   1145 - 1145   2021   （ ISSN:20411723 eISSN:2041-1723 ）

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    DOI： 10.1038/s41467-021-20956-4

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  • Phase Control of Noble Monometallic and Alloy Nanomaterials by Chemical Reduction Methods International journal

    Quan Zhang, Kohei Kusada, Hiroshi Kitagawa

    CHEMPLUSCHEM   86 ( 3 )   504 - 519   2021   （ ISSN:21926506 ）

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    DOI： 10.1002/cplu.202000782

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  • Investigation of microstructure and hydrogen absorption properties of bulk immiscible AgRh alloy nanoparticles

    Akhil Tayal, Okkyun Seo, Jaemyung Kim, Kohei Kusada, Hirokazu Kobayashi, Hiroshi Kitagawa, Osami Sakata

    Journal of Alloys and Compounds   869   2021   （ ISSN:09258388 eISSN:1873-4669 ）

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    DOI： 10.1016/j.jallcom.2021.159268

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  • First synthesis of air-stable NiZn homogeneous alloy nanoparticles through chemical reduction

    Shinya Okamoto, Kohei Kusada, Hiroshi Hashiba, Satoshi Yotsuhashi, Hiroshi Kitagawa

    Materials Advances   2 ( 2 )   684 - 687   2021   （ ISSN:26335409 eISSN:2633-5409 ）

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    DOI： 10.1039/d0ma00883d

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  • Chemoselective hydrogenation of heteroarenes and arenes by Pd–Ru–PVP under mild conditions

    Chandan Chaudhari, Katsutoshi Sato, Yoshihide Nishida, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Yasuyuki Ikeda, Kenji Terada, Naoya Abe, Kohei Kusuda, Hiroshi Kitagawa, Katsutoshi Nagaoka

    RSC Advances   10 ( 72 )   44191 - 44195   2020   （ eISSN:2046-2069 ）

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    Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

    <p>Recyclable Pd<sub>0.5</sub>Ru<sub>0.5</sub>–PVP catalyst showed higher activity than monometallic Pd or Ru catalyst for the hydrogenation of quinoline. Furthermore, Pd<sub>0.5</sub>Ru<sub>0.5</sub>–PVP was able to hydrogenate different arenes.</p>

    DOI： 10.1039/D0RA09981C

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  • Hydrogen absorption and desorption on Rh nanoparticles revealed by in situ dispersive X-ray absorption fine structure spectroscopy Reviewed International journal

    Chulho Song, Okkyun Seo, Daiju Matsumura, Satoshi Hiroi, Yi-Tao Cui, Jaemyung Kim, Yanna Chen, Akhil Tayal, Kohei Kusada, Hirokazu Kobayashi, Hiroshi Kitagawa, Osami Sakata

    RSC Advances   10 ( 34 )   19751 - 19758   2020   （ ISSN:20462069 eISSN:2046-2069 ）

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    DOI： 10.1039/d0ra03322g

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  • Correlation between the electronic/local structure and CO-oxidation activity of PdxRu1-x alloy nanoparticles (vol 1, pg 546, 2019) Reviewed

    Chulho Song, Akhil Tayal, Okkyun Seo, Jaemyung Kim, Yanna Chen, Satoshi Hiroi, L. S. R. Kumara, Kohei Kusada, Hirokazu Kobayashi, Hiroshi Kitagawa, Osami Sakata

    NANOSCALE ADVANCES   1 ( 2 )   895 - 895   2019   （ ISSN:25160230 ）

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    DOI： 10.1039/c9na90006c

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  • Correlation between the electronic/local structure and CO-oxidation activity of PdxRu1-x alloy nanoparticles Reviewed International journal

    Chulho Song, Akhil Tayal, Okkyun Seo, Jaemyung Kim, Yanna Chen, Satoshi Hiroi, L. S. R. Kumara, Kohei Kusada, Hirokazu Kobayashi, Hiroshi Kitagawa, Osami Sakata

    NANOSCALE ADVANCES   1 ( 2 )   546 - 553   2019   （ ISSN:25160230 ）

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    DOI： 10.1039/c8na00305j

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  • Alloy microparticles and method for producing same, alloy microparticle cluster, catalyst, and method for producing same Reviewed

    Kitagawa Hiroshi, Kusada Kohei, Kobayashi Hirokazu, Nagaoka Katsutoshi, Sato Katsutoshi, Matsumura Syo, Yamamoto Tomokazu

    2018.5

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    US Patent 9,962,683

  • Crystal Structure-dependent Thermal Stability and Catalytic Performance of AuRu3 Solid-solution Alloy Nanoparticles Reviewed

    Zhang, Quan, Kusada, Kohei, Wu, Dongshuang, Kawaguchi, Shogo, Kubota, Yoshiki, Kitagawa, Hiroshi

    Chemistry Letters   47 ( 4 )   559 - 561   2018

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  • Solid-Solution Alloy Nanoparticles of the Immiscible Iridium--Copper System with a Wide Composition Range for Enhanced Electrocatalytic Applications Reviewed

    Wang, Fenglong, Kusada, Kohei, Wu, Dongshuang, Yamamoto, Tomokazu, Toriyama, Takaaki, Matsumura, Syo, Nanba, Yusuke, Koyama, Michihisa, Kitagawa, Hiroshi

    Angewandte Chemie   130 ( 17 )   4595 - 4599   2018

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  • Size effects on rhodium nanoparticles related to hydrogen-storage capability Reviewed International journal

    Song, Chulho, Yang, Anli, Sakata, Osami, Kumara, LSR, Hiroi, Satoshi, Cui, Yi-Tao, Kusada, Kohei, Kobayashi, Hirokazu, Kitagawa, Hiroshi

    Physical Chemistry Chemical Physics   20 ( 22 )   15183 - 15191   2018   （ ISSN:14639076 eISSN:1463-9084 ）

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    DOI： 10.1039/c8cp01678j

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

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

    NATURE COMMUNICATIONS   9 ( 1 )   510 - 510   2018   （ ISSN:20411723 eISSN:2041-1723 ）

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    DOI： 10.1038/s41467-018-02933-6

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

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

    Nature communications   9 ( 1 )   510 - 510   2018

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  • Stacking fault density and bond orientational order of fcc ruthenium nanoparticles Reviewed

    Okkyun Seo, Osami Sakata, Jae Myung Kim, Satoshi Hiroi, Chulho Song, Loku Singgappulige Rosantha Kumara, Koji Ohara, Shun Dekura, Kohei Kusada, Hirokazu Kobayashi, Hiroshi Kitagawa

    APPLIED PHYSICS LETTERS   111 ( 25 )   2017.12   （ ISSN:0003-6951 eISSN:1077-3118 ）

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    DOI： 10.1063/1.5006830

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  • Facile Synthesis of Size-controlled Rh Nanoparticles via Microwave-assisted Alcohol Reduction and Their Catalysis of CO Oxidation Reviewed

    Yoshihide Nishida, Katsutoshi Sato, Tomokazu Yamamoto, Dongshuang Wu, Kohei Kusada, Hirokazu Kobayashi, Syo Matsumura, Hiroshi Kitagawa, Katsutoshi Nagaoka

    CHEMISTRY LETTERS   46 ( 8 )   1254 - 1257   2017.8   （ ISSN:0366-7022 eISSN:1348-0715 ）

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    DOI： 10.1246/cl.170440

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  • Electronic Structure Evolution with Composition Alteration of RhxCuy Alloy Nanoparticles Reviewed

    Natalia Palina, Osami Sakata, L. S. R. Kumara, Chulho Song, Katsutoshi Sato, Katsutoshi Nagaoka, Tokutaro Komatsu, Hirokazu Kobayashi, Kohei Kusada, Hiroshi Kitagawa

    SCIENTIFIC REPORTS   7   41264   2017.1   （ ISSN:2045-2322 ）

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    DOI： 10.1038/srep41264

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  • First-Principles Calculation, Synthesis, and Catalytic Properties of Rh-Cu Alloy Nanoparticles Reviewed International journal

    Tokutaro Komatsu, Hirokazu Kobayashi, Kohei Kusada, Yoshiki Kubota, Masaki Takata, Tomokazu Yamamoto, Syo Matsumura, Katsutoshi Sato, Katsutoshi Nagaoka, Hiroshi Kitagawa

    CHEMISTRY-A EUROPEAN JOURNAL   23 ( 1 )   57 - 60   2017.1   （ ISSN:0947-6539 eISSN:1521-3765 ）

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    DOI： 10.1002/chem.201604286

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  • Fine solid solution alloy particles and method for producing same Reviewed

    Kitagawa Hiroshi, Kusada Kohei, Makiura Rie

    2017.1

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    US Patent 9,540,712

  • Electronic Structure Evolution with Composition Alteration of Rh x Cu y Alloy Nanoparticles Reviewed International journal

    Palina, Natalia, Sakata, Osami, Kumara, LSR, Song, Chulho, Sato, Katsutoshi, Nagaoka, Katsutoshi, Komatsu, Tokutaro, Kobayashi, Hirokazu, Kusada, Kohei, Kitagawa, Hiroshi

    Scientific reports   7   41264 - 41264   2017   （ ISSN:2045-2322 ）

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    DOI： 10.1038/srep41264

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  • Stacking fault density and bond orientational order of fcc ruthenium nanoparticles Reviewed

    Seo, Okkyun, Sakata, Osami, Kim, Jae Myung, Hiroi, Satoshi, Song, Chulho, Kumara, Loku Singgappulige Rosantha, Ohara, Koji, Dekura, Shun, Kusada, Kohei, Kobayashi, Hirokazu, others

    Applied Physics Letters   111 ( 25 )   253101 - 253101   2017   （ ISSN:0003-6951 eISSN:1077-3118 ）

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    DOI： 10.1063/1.5006830

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  • First-Principles Calculation, Synthesis, and Catalytic Properties of Rh-Cu Alloy Nanoparticles Reviewed International journal

    Komatsu, Tokutaro, Kobayashi, Hirokazu, Kusada, Kohei, Kubota, Yoshiki, Takata, Masaki, Yamamoto, Tomokazu, Matsumura, Syo, Sato, Katsutoshi, Nagaoka, Katsutoshi, Kitagawa, Hiroshi

    Chemistry--A European Journal   23 ( 1 )   57 - 60   2017   （ ISSN:0947-6539 eISSN:1521-3765 ）

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    DOI： 10.1002/chem.201604286

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  • Facile Synthesis of Size-controlled Rh Nanoparticles via Microwave-assisted Alcohol Reduction and Their Catalysis of CO Oxidation Reviewed

    Nishida, Yoshihide, Sato, Katsutoshi, Yamamoto, Tomokazu, Wu, Dongshuang, Kusada, Kohei, Kobayashi, Hirokazu, Matsumura, Syo, Kitagawa, Hiroshi, Nagaoka, Katsutoshi

    Chemistry Letters   46 ( 8 )   1254 - 1257   2017   （ ISSN:0366-7022 eISSN:1348-0715 ）

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    DOI： 10.1246/cl.170440

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  • Origin of the catalytic activity of face-centered-cubic ruthenium nanoparticles determined from an atomic-scale structure. Reviewed International journal

    L S R Kumara, Osami Sakata, Shinji Kohara, Anli Yang, Chulho Song, Kohei Kusada, Hirokazu Kobayashi, Hiroshi Kitagawa

    Physical chemistry chemical physics : PCCP   18 ( 44 )   30622 - 30629   2016.11   （ ISSN:1463-9076 eISSN:1463-9084 ）

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    DOI： 10.1039/c6cp04088h

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    PubMed

  • Catalyst using Pd-Ru solid solution alloy fine particles Reviewed

    Kitagawa Hiroshi, Kusada Kohei, Nagaoka Katsutoshi, Sato Katsutoshi, Kutubi M, Shahajahan

    2016.9

    　More details

    Publisher：Google Patents  

    US Patent 9,452,417

  • Size dependence of structural parameters in fcc and hcp Ru nanoparticles, revealed by Rietveld refinement analysis of high-energy X-ray diffraction data Reviewed International journal

    Chulho Song, Osami Sakata, Loku Singgappulige Rosantha Kumara, Shinji Kohara, Anli Yang, Kohei Kusada, Hirokazu Kobayashi, Hiroshi Kitagawa

    SCIENTIFIC REPORTS   6   31400 - 31400   2016.8   （ ISSN:2045-2322 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/srep31400

    Web of Science

    PubMed

  • A Synthetic Pseudo-Rh: NOx Reduction Activity and Electronic Structure of Pd-Ru Solid-solution Alloy Nanoparticles Reviewed

    Katsutoshi Sato, Hiroyuki Tomonaga, Tomokazu Yamamoto, Syo Matsumura, Nor Diana Binti Zulkifli, Takayoshi Ishimoto, Michihisa Koyama, Kohei Kusada, Hirokazu Kobayashi, Hiroshi Kitagawa, Katsutoshi Nagaoka

    SCIENTIFIC REPORTS   6   28265   2016.6   （ ISSN:2045-2322 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/srep28265

    Web of Science

    PubMed

  • Fine solid solution alloy particles and method for producing same Reviewed

    Kitagawa Hiroshi, Kusada Kohei, Makiura Rie

    2016.3

    　More details

    Publisher：Google Patents  

    US Patent 9,273,378

  • A Route for Phase Control in Metal Nanoparticles: A Potential Strategy to Create Advanced Materials. Reviewed International journal

    Kohei Kusada, Hiroshi Kitagawa

    Advanced materials (Deerfield Beach, Fla.)   28 ( 6 )   1129 - 42   2016.2   （ ISSN:0935-9648 eISSN:1521-4095 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/adma.201502881

    Web of Science

    PubMed

  • A route for phase control in metal nanoparticles: a potential strategy to create advanced materials Reviewed International journal

    Kusada, Kohei, Kitagawa, Hiroshi

    Advanced Materials   28 ( 6 )   1129 - 1142   2016   （ ISSN:0935-9648 eISSN:1521-4095 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/adma.201502881

    Web of Science

    Scopus

    PubMed

  • Size dependence of structural parameters in fcc and hcp Ru nanoparticles, revealed by Rietveld refinement analysis of high-energy X-ray diffraction data Reviewed International journal

    Song, Chulho, Sakata, Osami, Kumara, Loku Singgappulige Rosantha, Kohara, Shinji, Yang, Anli, Kusada, Kohei, Kobayashi, Hirokazu, Kitagawa, Hiroshi

    Scientific reports   6   31400 - 31400   2016   （ ISSN:2045-2322 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/srep31400

    Web of Science

    PubMed

  • Origin of the catalytic activity of face-centered-cubic ruthenium nanoparticles determined from an atomic-scale structure Reviewed

    Kumara, LSR, Sakata, Osami, Kohara, Shinji, Yang, Anli, Song, Chulho, Kusada, Kohei, Kobayashi, Hirokazu, Kitagawa, Hiroshi

    Physical Chemistry Chemical Physics   18 ( 44 )   30622 - 30629   2016   （ ISSN:1463-9076 eISSN:1463-9084 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c6cp04088h

    Web of Science

  • A Synthetic Pseudo-Rh: NO x Reduction Activity and Electronic Structure of Pd--Ru Solid-solution Alloy Nanoparticles Reviewed International journal

    Sato, Katsutoshi, Tomonaga, Hiroyuki, Yamamoto, Tomokazu, Matsumura, Syo, Zulkifli, Nor Diana Binti, Ishimoto, Takayoshi, Koyama, Michihisa, Kusada, Kohei, Kobayashi, Hirokazu, Kitagawa, Hiroshi, others

    Scientific reports   6   28265 - 28265   2016   （ ISSN:2045-2322 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/srep28265

    Web of Science

    PubMed

  • Dual Lewis Acidic/Basic Pd0.5Ru0.5-Poly(N-vinyl-2-pyrrolidone) Alloyed Nanoparticle: Outstanding Catalytic Activity and Selectivity in Suzuki-Miyaura Cross-Coupling Reaction Reviewed

    Md. Shahajahan Kutubi, Katsutoshi Sato, Kenji Wada, Tomokazu Yamamoto, Syo Matsumura, Kohei Kusada, Hirokazu Kobayashi, Hiroshi Kitagawa, Katsutoshi Nagaoka

    CHEMCATCHEM   7 ( 23 )   3887 - 3894   2015.12   （ ISSN:1867-3880 eISSN:1867-3899 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/cctc.201500758

    Web of Science

    J-GLOBAL

  • Creation of novel solid-solution alloy nanoparticles on the basis of Density-of-States engineering by interelement fusion Reviewed

    Kobayashi, Hirokazu, Kusada, Kohei, Kitagawa, Hiroshi

    Accounts of chemical research   48 ( 6 )   1551 - 1559   2015

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    Publishing type：Research paper (scientific journal)   Publisher：ACS Publications  

  • Creation of New Functionality by Inter-element Fusion from Electronic Viewpoints

    古山通久, 屋山巴, 石元孝佳, ヤン アンリ, 坂田 修身, 吉川 英樹, 草田康平, 小林浩和, 北川宏

    検査技術   20 ( 8 )   16 - 20   2015   （ ISSN:1342-9825 ）

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    Language：Japanese  

    21世紀に入って10年、草田らは銀とロジウムを用いてパラジウム様の水素吸蔵特性を創出することに成功した。原子番号45のロジウムと原子番号47の銀を用いて原子番号46のパラジウムの機能を生み出したという成果は「現代の錬金術」として驚きをもって世界に受け止められた。二つの元素を混ぜて周期表上で間に位置する元素の機能を出そうとするコンセプト自体は半導体分野のバンド制御などで存在し、まったく存在しないわけではない。しかし、草田らの研究では、水と油のように混じり合わないことで知られてきた銀とロジウムが均質に混合した合金を作ることに成功しているとともに、水素を吸わない銀とロジウムを用いてパラジウム様の水素吸蔵現象を見出している。この「AとCという元素を混ぜ、間にあるBという元素の性質を作る」というコンセプトはのちに元素間融合と名付けられ、科学技術振興機構・戦略的創造研究推進事業の支援のもと、大きく発展している。

    J-GLOBAL

  • Hybrid materials of Ni NP@MOF prepared by a simple synthetic method Reviewed International journal

    Megumi Mukoyoshi, Hirokazu Kobayashi, Kohei Kusada, Mikihiro Hayashi, Teppei Yamada, Mitsuhiko Maesato, Jared M. Taylor, Yoshiki Kubota, Kenichi Kato, Masaki Takata, Tomokazu Yamamoto, Syo Matsumura, Hiroshi Kitagawa

    CHEMICAL COMMUNICATIONS   51 ( 62 )   12463 - 12466   2015   （ ISSN:1359-7345 eISSN:1364-548X ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c5cc04663g

    Web of Science

    PubMed

  • Hybrid materials of Ni NP@ MOF prepared by a simple synthetic method Reviewed International journal

    Mukoyoshi, Megumi, Kobayashi, Hirokazu, Kusada, Kohei, Hayashi, Mikihiro, Yamada, Teppei, Maesato, Mitsuhiko, Taylor, Jared M, Kubota, Yoshiki, Kato, Kenichi, Takata, Masaki, others

    Chemical Communications   51 ( 62 )   12463 - 12466   2015   （ ISSN:1359-7345 eISSN:1364-548X ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c5cc04663g

    Web of Science

    PubMed

  • Dual Lewis Acidic/Basic Pd0. 5Ru0. 5--Poly (N-vinyl-2-pyrrolidone) Alloyed Nanoparticle: Outstanding Catalytic Activity and Selectivity in Suzuki--Miyaura Cross-Coupling Reaction Reviewed

    Kutubi, Md, Sato, Katsutoshi, Wada, Kenji, Yamamoto, Tomokazu, Matsumura, Syo, Kusada, Kohei, Kobayashi, Hirokazu, Kitagawa, Hiroshi, Nagaoka, Katsutoshi, others

    ChemCatChem   7 ( 23 )   3887 - 3894   2015   （ ISSN:1867-3880 eISSN:1867-3899 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/cctc.201500758

    Web of Science

  • Ruthenium nanoparticles with essentially face-centered cubic structure and method for producing the same Reviewed

    Kitagawa Hiroshi, Kusada Kohei

    2014.12

    　More details

    Publisher：Google Patents  

    US Patent App. 14/344,840

  • An ordered bcc CuPd nanoalloy synthesised via the thermal decomposition of Pd nanoparticles covered with a metal-organic framework under hydrogen gas. Reviewed International journal

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

    Chemical communications (Cambridge, England)   50 ( 89 )   13750 - 3   2014.11   （ ISSN:1359-7345 eISSN:1364-548X ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c4cc05941g

    Web of Science

    PubMed

  • 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 International journal

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

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   136 ( 5 )   1864 - 1871   2014.2   （ ISSN:0002-7863 eISSN:1520-5126 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/ja409464g

    Web of Science

    PubMed

  • An ordered bcc CuPd nanoalloy synthesised via the thermal decomposition of Pd nanoparticles covered with a metal--organic framework under hydrogen gas Reviewed

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

    Chemical Communications   50 ( 89 )   13750 - 13753   2014   （ ISSN:1359-7345 eISSN:1364-548X ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c4cc05941g

    Web of Science

  • The valence band structure of AgxRh1-x alloy nanoparticles Reviewed

    Anli Yang, Osami Sakata, Kohei Kusada, Tomoe Yayama, Hideki Yoshikawa, Takayoshi Ishimoto, Michihisa Koyama, Hirokazu Kobayashi, Hiroshi Kitagawa

    APPLIED PHYSICS LETTERS   105 ( 15 )   153109-153109-5   2014   （ ISSN:00036951 eISSN:1077-3118 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1063/1.4896857

    Web of Science

    J-GLOBAL

  • 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 International journal

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

    Journal of the American Chemical Society   136 ( 5 )   1864 - 1871   2014   （ ISSN:0002-7863 eISSN:1520-5126 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/ja409464g

    Web of Science

    PubMed

  • Creation of New Metal Nanoparticles and Their Hydrogen-Storage and Catalytic Properties Reviewed

    Kusada, Kohei

    2014

    　More details

    Publisher：Springer  

  • Discovery of Face-Centered-Cubic Ruthenium Nanoparticles: Facile Size-Controlled Synthesis Using the Chemical Reduction Method Reviewed

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

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   135 ( 15 )   5493 - 5496   2013.4   （ ISSN:0002-7863 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/ja311261s

    Web of Science

    PubMed

  • Discovery of face-centered-cubic ruthenium nanoparticles: facile size-controlled synthesis using the chemical reduction method Reviewed International journal

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

    Journal of the American Chemical Society   135 ( 15 )   5493 - 5496   2013   （ ISSN:0002-7863 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/ja311261s

    Web of Science

    PubMed

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

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

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   132 ( 45 )   15896 - 15898   2010.11   （ ISSN:0002-7863 eISSN:1520-5126 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/ja107362z

    Web of Science

    PubMed

  • Hydrogen-storage properties of solid-solution alloys of immiscible neighboring elements with Pd Reviewed International journal

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

    Journal of the American Chemical Society   132 ( 45 )   15896 - 15898   2010   （ ISSN:0002-7863 eISSN:1520-5126 ）

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/ja107362z

    Web of Science

    PubMed

▼display all

Books

  • Creation of New Metal Nanoparticles and Their Hydrogen-Storage and Catalytic Properties (Springer Theses)

    Kohei Kusada（Role：Sole author）

    Springer  2014.7    （ ISBN:4431550860 ）

    　More details

    Total pages：78  

    ASIN

  • Creation of New Metal Nanoparticles and Their Hydrogen-Storage and Catalytic Properties

    Kusada, Kohei

    Springer  2014 

MISC

  • NMR Measurements on Antiferromagnetic LaFeO<sub>3</sub> Nanoparticles

    井原大志, 堀文哉, 北川俊作, 石田憲二, 草田康平, 草田康平, 北川宏

    日本物理学会講演概要集(CD-ROM)   79 ( 1 )   2024   （ ISSN:2189-079X ）

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  • NMR measurements on Pt-Ni nanoparticles

    井原大志, 堀文哉, 北川俊作, 石田憲二, 草田康平, 草田康平, 北川宏

    日本物理学会講演概要集(CD-ROM)   78 ( 2 )   2023   （ ISSN:2189-079X ）

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  • 動的構造の解析に基づいた合金ナノ粒子の格子の柔らかさに関する検討

    中村雅史, WU Dongshuang, 向吉恵, 草田康平, 草田康平, 鳥山誉亮, 山本知一, 村上恭和, 村上恭和, 河口彰吾, 伊奈稔哲, 久保田佳基, 北川宏

    ナノ学会大会講演予稿集   21st (Web)   2023

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  • Element-Selective Observation of Dynamics in High-Entropy Alloy Nanoparticles with XAFS

    中村雅史, WU Dongshuang, 向吉恵, 草田康平, 草田康平, 鳥山誉亮, 山本知一, 村上恭和, 村上恭和, 久保田佳基, 河口彰吾, 伊奈稔哲, 加藤和男, 北川宏

    日本物理学会講演概要集(CD-ROM)   78 ( 1 )   2023   （ ISSN:2189-079X ）

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  • 機械学習を用いた電気化学的水素発生反応における高活性多元素ナノ合金触媒の探索

    丸田悠斗, 草田康平, 草田康平, 山本知一, 鳥山誉亮, 村上恭和, SEO Okkyun, 坂田修身, 河口彰吾, 久保田佳基, 金子弘昌, 北川宏

    触媒討論会予稿集(CD-ROM)   132nd   2023   （ ISSN:2758-3503 ）

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  • 積層欠陥モデルを導入した多元素ナノ合金の構造評価

    芦谷拓嵩, 河口彰吾, 草田康平, 尾原幸治, 北川宏, 坂田修身

    日本結晶学会年会講演要旨集   2023   2023

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  • 機械学習を用いた高活性多元素ナノ合金触媒の探索

    丸田悠斗, 草田康平, 草田康平, 山本知一, 鳥山誉亮, 村上恭和, 村上恭和, SEO Okkyun, 坂田修身, 河口彰吾, 久保田佳基, 金子弘昌, 北川宏

    ナノ学会大会講演予稿集   21st (Web)   2023

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  • 貴金属8元素からなる新合金を創製 : 多元素の混合で新しい原子に生まれ変わる

    草田 康平, 吴 冬霜, 北川 宏

    化学 = Chemistry   77 ( 7 )   39 - 42   2022.7   （ ISSN:0451-1964 ）

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    Language：Japanese  

    CiNii Books

    CiNii Research

  • Continuous-Flow Reactor Synthesis for 1-nm-Sized Platinum Group High-Entropy Alloy Nanoparticles and Evaluation of Their Hydrogen Evolution Catalytic Activity

    南原宏紀, 草田康平, 草田康平, 草田康平, WU Dongshuang, 山本知一, 鳥山誉亮, 松村晶, 松村晶, KUMARA Loku Singgapulige Rosantha, 尾原幸治, 坂田修身, 河口彰吾, 久保田佳基, 北川宏

    ナノ学会大会講演予稿集   20th   2022

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  • Supercritical-Water Synthesis and Characterization of Nonary High-Entropy Metal Oxide Nanoparticles

    神田凌平, 草田康平, 草田康平, 草田康平, 鳥山誉亮, 山本知一, 松村晶, 松村晶, 河口彰吾, 久保田佳基, 北川宏

    日本化学会春季年会講演予稿集(Web)   102nd   2022

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  • Supercritical-Water Synthesis and Characterization of Nonary High-Entropy Oxide Nanoparticles

    神田凌平, 草田康平, 草田康平, 草田康平, 鳥山誉亮, 山本知一, 松村晶, 松村晶, 河口彰吾, 久保田佳基, 北川宏

    ナノ学会大会講演予稿集   20th   2022

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  • Synthesis of 1-nm-sized IrPdPtRhRu high-entropy alloy nanoparticles with continuous-flow reactor and evaluation of their hydrogen evolution catalytic activity

    南原宏紀, 草田康平, 草田康平, 草田康平, WU Dongshuang, 山本知一, 鳥山誉亮, 松村晶, 松村晶, KUMARA Loku Singgapulige Rosantha, 尾原幸治, 坂田修身, 河口彰吾, 久保田佳基, 北川宏

    分子科学討論会講演プログラム&要旨(Web)   16th   2022

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  • Synthesis and Catalytic Properties of Liquid Metal-Transition Metal High-Entropy Alloy Nanoparticles

    中村雅史, WU Dongshuang, 向吉恵, 草田康平, 草田康平, 草田康平, 鳥山誉亮, 山本知一, 松村晶, 松村晶, 久保田佳基, 河口彰吾, 伊奈稔哲, 北川宏

    分子科学討論会講演プログラム&要旨(Web)   16th   2022

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  • Compositional Dependence of Structures and Properties of Platinum-Group Metal Quinary Alloy Nanoparticles

    丸田悠斗, 草田康平, 草田康平, 草田康平, WU Dongshuang, 山本知一, 鳥山誉亮, 松村晶, 松村晶, SEO Okkyun, 坂田修身, 河口彰吾, 久保田佳基, 北川宏

    ナノ学会大会講演予稿集   20th   2022

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  • Liquid Metal-Transition Metal High-Entropy Alloy Nanoparticles and Their Catalytic Properties

    中村雅史, WU Dongshuang, 向吉恵, 草田康平, 草田康平, 鳥山誉亮, 山本知一, 松村晶, 久保田佳基, 河口彰吾, 北川宏

    ナノ学会大会講演予稿集   20th   2022

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  • ハイエントロピー合金ナノ粒子を用いた水素発生反応電極触媒開発

    草田康平, ご冬霜, 北川宏

    クリーンエネルギー   30 ( 3 )   31 - 36   2021   （ ISSN:0918-7510 ）

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    Language：Japanese   Publisher：日本工業出版  

    CiNii Books

    J-GLOBAL

  • 核誘起結晶構造制御によるRu基固溶合金のアルカリ水素発生反応触媒の開発

    張権, 草田康平, 呉冬霜, 山本知一, 鳥山誉亮, 松村晶, 河口彰吾, 久保田佳基, ASPERA Menez Susan, 中西寛, 北川宏

    触媒討論会討論会A予稿集(CD-ROM)   128th   2021   （ ISSN:2758-3503 ）

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  • 配置エントロピー効果を用いた高活性高耐久性を示す固溶ナノ合金三元触媒の開発

    草田康平, 草田康平, WU Dongshuang, 難波優輔, 古山通久, 山本知一, XUAN Quy Tran, 鳥山誉亮, 松村晶, 佐藤勝俊, 佐藤勝俊, 永岡勝俊, 北川宏

    触媒討論会討論会A予稿集(CD-ROM)   128th   2021   （ ISSN:2758-3503 ）

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  • Separation of quantum size effects and surface effects and anomalous magnetic fluctuations on platinum nanoparticles observed by using ¹⁹⁵Pt-NMR Invited Reviewed

    奥野友則, 北川俊作, 石田憲二, 草田康平, 北川 宏

    京都大学物性科学センター誌：LTMセンター誌   36   11 - 20   2020.6   （ ISSN:2469-9950 eISSN:2469-9969 ）

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    Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (bulletin of university, research institution)   Publisher：American Physical Society (APS)  

    DOI： 10.14989/264751

    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.101.121406/fulltext

  • Separation of quantum size effects and surface effects and anomalous magnetic fluctuations on platinum nanoparticles observed by using <sup>195</sup>Pt-NMR

    奥野友則, 北川俊作, 石田憲二, 草田康平, 北川宏

    京都大学物性科学センター誌   ( 36 )   11 - 20   2020   （ ISSN:2432-0587 ）

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  • Synthesis and characterization of Mo-Ru alloy nanoparticles

    岡副眞也, 草田康平, 山本知一, 鳥山誉亮, 松村晶, 河口彰吾, 久保田佳基, 北川宏

    日本化学会春季年会講演予稿集(CD-ROM)   100th   2020

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  • Mo-Ru合金ナノ粒子の合成と同定

    岡副眞也, 草田康平, 山本知一, 鳥山誉亮, 松村晶, 河口彰吾, 久保田佳基, 北川宏

    京都大学物性科学センター誌   ( 36 )   2020   （ ISSN:2432-0587 ）

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  • Synthesis and characterization of face-centered cubic osmium nanoparticles

    脇坂拓生, 草田康平, 山本知一, 鳥山誉亮, 松村晶, 松村晶, 河口彰吾, 久保田佳基, 北川宏

    日本化学会春季年会講演予稿集(CD-ROM)   100th   2020

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  • <sup>195</sup>Pt-NMR Studies on Pt-Pd Nanoparticles

    木下雄大, 奥野友則, 北川俊作, 石田憲二, 草田康平, 北川宏

    日本物理学会講演概要集(CD-ROM)   75 ( 2 )   2020   （ ISSN:2189-079X ）

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  • 核磁気共鳴による白金ナノ粒子の研究

    奥野友則, 木下雄太, 松崎聡, 真砂全宏, 北川俊作, 石田憲二, 草田康平, 北川宏

    京都大学物性科学センター誌   ( 36 )   2020   （ ISSN:2432-0587 ）

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  • Creation of the Functional Materials on the Basis of the Inter-Element-Fusion Strategy and Their Innovative Applications

    草田康平, 北川宏

    化学工学   84 ( 1 )   11 - 14   2020   （ ISSN:0375-9253 ）

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  • Study on Three-Way Catalysts with Solid-Solution Alloy Nanoparticles and Flow-Type Solvothermal Synthesis

    草田康平, 北川宏

    月刊Material Stage   20 ( 5 )   19 - 23   2020   （ ISSN:1346-3926 ）

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  • オスミウムナノ粒子の結晶構造制御

    脇坂拓生, 草田康平, 山本知一, 鳥山誉亮, 松村晶, 松村晶, 北川宏

    京都大学物性科学センター誌   ( 36 )   2020   （ ISSN:2432-0587 ）

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  • Pt-Pdナノ粒子のNMRによる研究

    木下雄大, 奥野友則, 北川俊作, 石田憲二, 草田康平, 北川宏

    京都大学物性科学センター誌   ( 36 )   2020   （ ISSN:2432-0587 ）

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  • NMR Studies on Pt-Pd Nanoparticles

    木下雄大, 奥野友則, 北川俊作, 石田憲二, 草田康平, 北川宏

    日本物理学会講演概要集(CD-ROM)   75 ( 1 )   2020   （ ISSN:2189-079X ）

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  • Ptナノ粒子のNMRによる研究:磁場依存性

    奥野友則, 真砂全宏, 北川俊作, 石田憲二, 草田康平, 小林浩和, 北川宏

    日本物理学会講演概要集(CD-ROM)   74 ( 2 )   2019   （ ISSN:2189-079X ）

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  • 核磁気共鳴によるPtナノ粒子の研究

    奥野友則, 真砂全宏, 北川俊作, 石田憲二, 草田康平, 小林浩和, 北川宏

    京都大学物性科学センター誌   ( 34 )   2019   （ ISSN:2432-0587 ）

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  • 新規ロジウム炭化物ナノ粒子の合成とHER触媒活性評価

    脇坂拓生, 草田康平, WU Donghuang, 山本知一, 松村晶, RYAN Arevalo, SUSAN Aspera, ELVIS Arguelles, 中西寛, 北川宏

    ナノ学会大会講演予稿集   17th   2019

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  • Palladium-Ruthenium Solid-Solution Nano Alloy as an Alternative Material to Rhodium Catalyst

    佐藤勝俊, 永岡勝俊, 草田康平, 北川宏

    月刊Material Stage   19 ( 8 )   15 - 18   2019   （ ISSN:1346-3926 ）

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  • ロジウム炭化物の電極触媒活性評価

    脇坂拓生, 草田康平, WU Dongshuang, WEI Xie, 古山通久, 北川宏

    京都大学物性科学センター誌   ( 34 )   2019   （ ISSN:2432-0587 ）

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  • Ptナノ粒子のNMRによる研究:粒径依存性

    奥野友則, 米川和志, 真砂全宏, 北川俊作, 石田憲二, 草田康平, 小林浩和, 北川宏

    日本物理学会講演概要集(CD-ROM)   74 ( 1 )   2019   （ ISSN:2189-079X ）

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  • hcp及びfcc構造Ruナノ粒子の形成メカニズムの解明

    荒木直樹, 草田康平, 吉岡聰, 杉山武晴, 伊奈稔哲, 北川宏

    京都大学物性科学センター誌   ( 32 )   41   2018   （ ISSN:2432-0587 ）

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  • PDF解析によるPdRuM(M=Rh,Pt,Ir)合金ナノ粒子の固溶性の研究

    秋葉宙, 草田康平, WU Dongshuang, 北川宏, KEEN David, 山室修

    日本中性子科学会年会講演概要集   18th   71   2018

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  • PdAg合金ナノ粒子の水素雰囲気下での局所構造

    扇一輝, 東原登史希, 吉岡聰, 松村晶, 草田康平, 北川宏

    応用物理学会九州支部学術講演会講演予稿集(Web)   44   85 (WEB ONLY)   2018

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  • ナノ合金の結晶構造を操る

    草田康平, 北川宏

    現代化学   ( 568 )   29 - 33   2018   （ ISSN:0386-961X ）

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  • 核磁気共鳴によるPdナノ粒子の研究

    奥野友則, 米川和志, 真砂全宏, 北川俊作, 石田憲二, 草田康平, 小林浩和, 北川宏

    京都大学物性科学センター誌   ( 32 )   29   2018   （ ISSN:2432-0587 ）

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  • 中性子回折によるPdRuM合金ナノ粒子(M=Rh,Pt,Ir)の固溶性の研究

    秋葉宙, 草田康平, WU Dongshuang, 北川宏, KEEN David, 山室修

    日本物理学会講演概要集(CD-ROM)   73 ( 2 )   ROMBUNNO.9aC215‐2   2018   （ ISSN:2189-079X ）

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  • ロジウム炭化物の磁性評価

    脇坂拓生, 草田康平, 林幹大, XIE Wei, 古山通久, NATALIA Mueller, 坂田修身, 北川宏

    京都大学物性科学センター誌   ( 32 )   39   2018   （ ISSN:2432-0587 ）

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  • ホウ素の導入による新規金属ナノ構造体の発現

    小林佳吾, 小林浩和, 小林浩和, 草田康平, WU Dongshuang, 前里光彦, 林幹大, 山本知一, 吉岡聰, 松村晶, 松村晶, 鳥山誉亮, 杉山武晴, 河口彰吾, 久保田佳基, 中西寛, 中西寛, 北川宏

    ナノ学会大会講演予稿集   16th   109   2018

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  • Hydrogen Properties and Catalysis of Alloy Nanoparticles.

    草田康平, 小林浩和, 小林浩和, 北川宏

    触媒   60 ( 3 )   127 - 133   2018   （ ISSN:0559-8958 ）

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  • 核磁気共鳴を用いたPdナノ粒子の低温の磁気状態の研究

    奥野友則, 米川和志, 真砂全宏, 北川俊作, 石田憲二, 草田康平, 小林浩和, 北川宏

    日本物理学会講演概要集(CD-ROM)   73 ( 1 )   ROMBUNNO.22pPSB‐7   2018   （ ISSN:2189-079X ）

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  • 金属ナノ粒子(Pd,Pt)のNMRによる研究

    奥野友則, 米川和志, 真砂全宏, 北川俊作, 石田憲二, 草田康平, 小林浩和, 北川宏

    日本物理学会講演概要集(CD-ROM)   73 ( 2 )   ROMBUNNO.12aC117‐2   2018   （ ISSN:2189-079X ）

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  • 貴金属ナノ粒子へのホウ素の導入による新規ナノ構造の発現

    小林佳吾, 小林浩和, 小林浩和, 草田康平, ご冬霜, 前里光彦, 林幹大, 山本知一, 吉岡聰, 松村晶, 松村晶, 鳥山誉亮, 杉山武晴, 河口彰吾, 久保田佳基, 中西寛, 中西寛, 北川宏

    京都大学物性科学センター誌   ( 32 )   39   2018   （ ISSN:2432-0587 ）

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  • fcc,hcp構造を有する各のRuナノ粒子の原子配列構造

    坂田修身, KUMARA L. S. R., 宋哲昊, 小原真司, 草田康平, 小林浩和, 北川宏

    日本放射光学会年会・放射光科学合同シンポジウム(Web)   30th   2017

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  • PdAg合金ナノ粒子の水素雰囲気下でのXAFS構造解析

    扇一輝, 東原登史紀, 吉岡聰, 松村晶, 草田康平, 北川宏

    日本金属学会講演概要(CD-ROM)   161st   ROMBUNNO.P75   2017   （ ISSN:2433-3093 ）

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  • PdRu‐Rh固溶合金ナノ粒子の熱安定性

    河野芳輝, 阿内三成, 山本知一, 草田康平, 北川宏, 松村晶

    日本金属学会講演概要(CD-ROM)   161st   ROMBUNNO.S2.14   2017   （ ISSN:2433-3093 ）

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  • 新規ロジウム炭化物の合成

    脇坂拓生, 草田康平, 山本知一, 松村晶, MUELLER Natalia, 坂田修身, 北川宏

    京都大学物性科学センター誌   ( 30 )   46   2017   （ ISSN:2432-0587 ）

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  • ロジウム‐銅ナノ合金の電子構造と触媒活性

    小松徳太郎, 小松徳太郎, 小林浩和, 小林浩和, 草田康平, 久保田佳基, 山本知一, 松村晶, 佐藤勝俊, 永岡勝俊, 北川宏

    日本化学会春季年会講演予稿集(CD-ROM)   97th   ROMBUNNO.3B5‐06   2017

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  • A Route for Phase Control in Metal Nanoparticles and Their Development for New Nanomaterials

    草田康平

    化学工業   68 ( 8 )   562 - 568   2017   （ ISSN:0451-2014 ）

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  • PtRu合金ナノ粒子の合成とその構造および物性の評価

    池渕徹也, 草田康平, 山本知一, 松村晶, 久保田佳基, 北川宏

    日本化学会春季年会講演予稿集(CD-ROM)   97th   ROMBUNNO.3B5‐07   2017

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  • PtRu合金ナノ粒子の原子分解能STEMトモグラフィー観察

    山本知一, 重松晃次, 草田康平, 北川宏, 松村晶

    日本金属学会講演概要(CD-ROM)   161st   ROMBUNNO.140   2017   （ ISSN:2433-3093 ）

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  • Pd系合金ナノ粒子とその重水素化物の中性子回折

    秋葉宙, 小林浩和, 草田康平, 北川宏, 池田一貴, 大友季哉, 池田一貴, 大友季哉, 山室修

    日本中性子科学会年会講演概要集   17th   62   2017

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  • Pd合金ナノ粒子の水素雰囲気下でのXAFS構造解析

    扇一輝, 東原登史希, 吉岡聰, 松村晶, 草田康平, 北川宏

    日本金属学会九州支部・日本鉄鋼協会九州支部・軽金属学会九州支部合同学術講演大会講演概要集   2017   P60   2017

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  • Pdナノ粒子の核磁気共鳴による研究

    石田憲二, 米川和志, 真砂全宏, 北川俊作, 草田康平, 小林浩和, 北川宏

    日本物理学会講演概要集(CD-ROM)   72 ( 2 )   ROMBUNNO.24aE31‐15   2017   （ ISSN:2189-079X ）

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  • PdRu合金ナノ粒子とその重水素化物の中性子回折

    秋葉宙, 草田康平, 小林浩和, 北川宏, 池田一貴, 池田一貴, 大友季哉, 大友季哉, 山室修

    日本物理学会講演概要集(CD-ROM)   72 ( 2 )   ROMBUNNO.24aA45‐3   2017   （ ISSN:2189-079X ）

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  • PdRuRh合金触媒ナノ粒子の熱安定性に関する電子顕微鏡その場解析

    河野芳輝, 阿内三成, 山本知一, 草田康平, 北川宏, 松村晶

    日本金属学会九州支部・日本鉄鋼協会九州支部・軽金属学会九州支部合同学術講演大会講演概要集   2017   P61   2017

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  • Ruナノ粒子の水素化物の中性子回折

    秋葉宙, 秋葉宙, 古府麻衣子, 古府麻衣子, 草田康平, 草田康平, 小林浩和, 小林浩和, 北川宏, 北川宏, 池田一貴, 大友季哉, 山室修, 山室修

    日本物理学会講演概要集(CD-ROM)   71 ( 2 )   2016   （ ISSN:2189-079X ）

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  • 新規ロジウム炭化物ナノ粒子の戦略的合成と構造決定

    脇坂拓生, 草田康平, 山本知一, 吉岡聰, 東原登史希, 松村晶, 久保田佳基, 北川宏

    ナノ学会大会講演予稿集   14th   2016

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  • 新規ロジウム炭化物の戦略的合成

    脇坂拓生, 草田康平, 山本知一, 吉岡聰, 東原登史希, 松村晶, 久保田佳基, 北川宏

    分子科学討論会講演プログラム&要旨(Web)   10th   2016

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  • 新規ロジウム炭化物の合成と同定

    脇坂拓生, 草田康平, 山本知一, 吉岡聰, 東原登史希, 松村晶, 久保田佳基, 北川宏

    日本化学会春季年会講演予稿集(CD-ROM)   96th   2016

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  • ルテニウムナノ粒子の水素吸蔵熱

    秋葉宙, 秋葉宙, 古府麻衣子, 古府麻衣子, 草田康平, 草田康平, 小林浩和, 小林浩和, 北川宏, 北川宏, 山室修, 山室修

    熱測定討論会講演要旨集   52nd   2016

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  • 22pBM-10 NMR Study on Ru Nano Particles

    Nishimiya D., Manago M., Ishida K., Kusada K., Kitagawa H.

    Meeting Abstracts of the Physical Society of Japan   71 ( 1 )   2466 - 2466   2016   （ ISSN:2189-079X ）

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    Language：Japanese   Publisher：The Physical Society of Japan  

    DOI： 10.11316/jpsgaiyo.71.1.0_2466

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  • Ru水素化物ナノ粒子の中性子回折

    秋葉宙, 秋葉宙, 古府麻衣子, 古府麻衣子, 草田康平, 草田康平, 小林浩和, 小林浩和, 北川宏, 北川宏, 池田一貴, 大友季哉, 山室修, 山室修

    日本中性子科学会年会講演概要集   16th   2016

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  • 核磁気共鳴法を用いた金属ナノ粒子の研究

    西宮大輔, 石田憲二, 真砂真全, 北川宏, 草田康平

    京都大学物性科学センター誌   ( 28 )   2016   （ ISSN:2432-0587 ）

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  • 面心立方体構造を有するルテニウムナノ粒子の原子分解能STEM観察

    山本知一, 松村晶, 草田康平, 北川宏

    日本金属学会講演概要(CD-ROM)   159th   2016   （ ISSN:2433-3093 ）

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  • 水素雰囲気下でのRh系ナノ粒子のXAFS状態解析

    東原登史希, 吉本敏規, 山本知一, 吉岡聰, 松村晶, 草田康平, 北川宏

    日本金属学会九州支部・日本鉄鋼協会九州支部・軽金属学会九州支部合同学術講演大会講演概要集   2016   2016

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  • Ag-Rh合金ナノ粒子の価電子帯スペクトル

    坂田修身, 楊安麗, 草田康平, 屋山巴, 吉川英樹, 石元孝佳, 古山通久, 小林宏和, 北川宏

    日本放射光学会年会・放射光科学合同シンポジウム予稿集   28th   2015

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  • RuおよびPt/Pd合金のナノ粒子の中性子回折

    秋葉宙, 秋葉宙, 古府麻衣子, 草田康平, 小林浩和, 北川宏, 古府麻衣子, 草田康平, 小林浩和, 北川宏, 池田一貴, 大友季哉, 山室修, 山室修

    日本中性子科学会年会講演概要集   15th   2015

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  • 材料の長寿命化への取り組み 燃料電池の長寿命化へ向けた金属ルテニウム触媒の開発

    KUSADA KOHEI, KITAGAWA HIROSHI

    化学工学   79 ( 5 )   370 - 371   2015   （ ISSN:0375-9253 ）

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    Language：Japanese  

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  • 新規fcc構造を有するルテニウムナノ粒子の合成とその物性

    草田康平, 山本知一, 松村晶, 佐藤勝俊, 永岡勝俊, KUMARA Rosantha, 坂田修身, 北川宏

    日本化学会講演予稿集   95th ( 3 )   763   2015   （ ISSN:0285-7626 ）

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  • 24aPS-108 NMR Study on Ru Nano Particles

    Nishimiya D., Manago M., Ishida K., Kusada K., Kitagawa H.

    Meeting Abstracts of the Physical Society of Japan   70 ( 1 )   2457 - 2457   2015   （ ISSN:2189-079X ）

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    Language：Japanese   Publisher：The Physical Society of Japan  

    DOI： 10.11316/jpsgaiyo.70.1.0_2457

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  • キノリンの選択的水素化へのPd‐Ru固溶ナノ粒子触媒の応用

    山本秀昂, 今村和也, 佐藤勝俊, 佐藤勝俊, 草田康平, 草田康平, 小林浩和, 小林浩和, 北川宏, 北川宏, 永岡勝俊, 永岡勝俊

    触媒討論会討論会A予稿集   116th   134   2015   （ ISSN:1343-9936 ）

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  • 19aCD-11 NMR Study on Ru Nano Particles

    Nishimiya D., Manago M., Ishida K., Kusada K., Kitagawa H.

    Meeting Abstracts of the Physical Society of Japan   70 ( 2 )   2073 - 2073   2015   （ ISSN:2189-079X ）

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    Language：Japanese   Publisher：The Physical Society of Japan  

    DOI： 10.11316/jpsgaiyo.70.2.0_2073

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  • 水素吸蔵特性をもつAg-Rh合金ナノ粒子の価電子帯スペクトル観測

    坂田修身, YANG Anli, 草田康平, 屋山巴, 吉川英樹, 石元孝佳, 古山通久, 小林浩和, 北川宏

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   62nd   2015   （ ISSN:2436-7613 ）

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  • Pd‐Ruナノ粒子の三元触媒活性評価

    山本知一, 佐藤勝俊, 草田康平, 小林浩和, 友永裕之, 吉岡聰, 安田和弘, 永岡勝俊, 北川宏, 松村晶

    日本金属学会講演概要(CD-ROM)   155th   ROMBUNNO.138   2014.9   （ ISSN:1342-5730 ）

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  • Pd‐Ru合金ナノ粒子の熱安定性とCO選択酸化触媒活性

    山本知一, 草田康平, 佐藤勝俊, 小林浩和, 友永裕之, 兼松誉, 吉岡聰, 安田和弘, 永岡勝俊, 北川宏, 松村晶

    日本金属学会講演概要(CD-ROM)   154th   ROMBUNNO.103   2014.3   （ ISSN:1342-5730 ）

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  • CO酸化をモデル反応としたPd‐Ru固溶型ナノ合金の触媒特性評価

    財津修平, 佐藤勝俊, 安高美奈子, 屋山巴, 石元孝佳, 古山通久, 山本知一, 松村晶, 草田康平, 小林浩和, 北川宏, 永岡勝俊

    触媒討論会討論会A予稿集   114th   476   2014   （ ISSN:1343-9936 ）

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  • Pd-Ru合金ナノ粒子の熱安定性とCO選択酸化触媒活性

    山本知一, 山本知一, 草田康平, 佐藤勝俊, 佐藤勝俊, 小林浩和, 小林浩和, 友永裕之, 兼松誉, 吉岡聰, 吉岡聰, 安田和弘, 安田和弘, 永岡勝俊, 永岡勝俊, 永岡勝俊, 北川宏, 北川宏, 松村晶, 松村晶

    日本金属学会講演概要(CD-ROM)   154th   2014   （ ISSN:2433-3093 ）

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  • Pd-Ruナノ粒子の三元触媒活性評価

    山本知一, 山本知一, 佐藤勝俊, 佐藤勝俊, 草田康平, 草田康平, 小林浩和, 小林浩和, 友永裕之, 吉岡聰, 吉岡聰, 安田和弘, 安田和弘, 永岡勝俊, 永岡勝俊, 永岡勝俊, 北川宏, 北川宏, 松村晶, 松村晶

    日本金属学会講演概要(CD-ROM)   155th   2014   （ ISSN:2433-3093 ）

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  • 担持Pd‐Ru触媒の自動車排ガス浄化反応への応用

    友永裕之, 兼松誉, 佐藤勝俊, 山本知一, 松村晶, 草田康平, 小林浩和, 北川宏, 永岡勝俊

    触媒討論会討論会A予稿集   114th   468   2014   （ ISSN:1343-9936 ）

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  • 現代の錬金術!? 元素間融合による”人工”ロジウムの創製 ナノサイズ効果を利用した新規機能性材料の研究

    草田康平, 小林浩和, 北川宏

    化学   69 ( 7 )   24 - 28   2014   （ ISSN:0451-1964 ）

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    Language：Japanese   Publisher：化学同人  

    CiNii Books

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  • 新規PdRu固溶体ナノ粒子の合成とその物性

    草田康平, 小林浩和, 北川宏, 北川宏, 北川宏

    日本化学会講演予稿集   92nd ( 3 )   2012   （ ISSN:0285-7626 ）

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  • 新規PdRu固溶体ナノ粒子の構造と物性

    草田康平, 小林浩和, 小林浩和, 久保田佳基, 藤昇一, 藤昇一, 松村晶, 松村晶, 角直哉, 角直哉, 佐藤勝俊, 佐藤勝俊, 永岡勝俊, 永岡勝俊, 北川宏, 北川宏, 北川宏

    分子科学討論会講演プログラム&amp;要旨(Web)   6th   ROMBUNNO.2P067 (WEB ONLY)   2012

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  • 金属の水素吸蔵と周期表

    KUSADA KOHEI, KITAGAWA HIROSHI

    化学と教育   60 ( 8 )   336 - 339   2012   （ ISSN:0386-2151 ）

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    Language：Japanese   Publisher：公益社団法人 日本化学会  

    水素は次世代のエネルギーとして期待されており,その貯蔵媒体として水素吸蔵合金はほぼ半世紀近く注目され続けている。元素と水素の化学結合性は両者の電気陰性度と関係している。周期表上で元素が左から右へ移るにつれ,その水素化物の結合性はイオン結合性から金属結合性,そして共有結合性へと変化する。パラジウムは多量の水素を吸蔵することで古くから知られている。パラジウムと水素の相性が良いのは,両者の電気陰性度がほぼ同じであることに起因している。したがって,パラジウムと水素は,両者の電子軌道間の相互作用が大きく,エネルギー的に安定な合金を形成している。Pd-H間の化学結合は金属結合であり,PdHはパラジウムと水素の合金である。パラジウムに特徴的な水素吸蔵能は,その電子状態と密接に関係していると言える。では,周期表上でパラジウムの両隣に位置する元素を混ぜるとどうなるのだろうか?パラジウムのような物質はつくれるのだろうか?本稿では,金属と水素の化学結合性を基礎として,周期表における希少金属代替の元素戦略について解説をする。

    DOI： 10.20665/kakyoshi.60.8_336

    CiNii Books

    J-GLOBAL

  • パラジウムを代替する新合金としてのナノ材料 : 現代の錬金術を目指して

    草田 康平, 北川 宏

    化学と工業 = Chemistry and chemical industry   64 ( 10 )   777 - 779   2011.10   （ ISSN:0022-7684 ）

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    Language：Japanese   Publisher：日本化学会  

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  • AgRh固溶体型合金ナノ粒子の水素吸蔵特性

    草田康平, 小林浩和, 北川宏

    京都大学低温物質科学研究センター誌   ( 18 )   2011   （ ISSN:1348-317X ）

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  • HD‐2700によるナノ合金の原子レベル構造評価

    KOBAYASHI HIROKAZU, KUSADA KOHEI, KITAGAWA HIROSHI

    Hitachi Sci Instrum News   54 ( 1 )   4567 - 4570   2011

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  • レアメタル採掘・回収・代替の新技術 3 パラジウムを代替する新合金としてのナノ材料 現代の錬金術を目指して

    KUSADA KOHEI, KITAGAWA HIROSHI

    化学と工業   64 ( 10 )   777 - 779   2011   （ ISSN:0022-7684 ）

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  • 新規固溶体型合金ナノ粒子の合成と物性

    草田康平, 小林浩和, 北川宏, 北川宏

    分子科学討論会講演プログラム&要旨(Web)   5th   2011

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  • 新規固溶体型合金ナノ粒子の合成とその水素吸蔵特性

    草田康平, 小林浩和, 北川宏

    日本化学会講演予稿集   91st ( 3 )   2011   （ ISSN:0285-7626 ）

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  • 新規PdRu固溶体ナノ粒子の合成と水素吸蔵特性

    草田康平, 小林浩和, 北川宏

    コロイドおよび界面化学討論会講演要旨集   63rd   2011

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  • AgRh solid-solution alloy nanoparticles exhibiting a hydrogen-storage property

    草田 康平, 小林 浩和, 山内 美穂

    The Journal of fuel cell technology   10 ( 4 )   107 - 110,図巻頭1p   2011   （ ISSN:1346-6623 ）

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    Language：Japanese   Publisher：燃料電池開発情報センター  

  • PdRu合金ナノ粒子の合成と構造

    草田康平, 小林浩和, 北川宏, 北川宏

    分子科学討論会講演プログラム&要旨(Web)   4th   2010

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  • 固溶体型AgRhナノ粒子の合成と水素吸蔵特性

    草田康平, 北川宏, 久保田佳基

    日本化学会講演予稿集   90th ( 3 )   2010   （ ISSN:0285-7626 ）

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Research Projects

  • 非平衡合成による多元素ナノ合金の創製

    Grant number：20H05623 

    北川 宏, 草田 康平, 古山 通久, 大坪 主弥, 吉田 幸大

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    Grant type：Scientific research funding

    本研究では、多元素ハイエントロピー効果により、多くの元素種を固溶化させることで、新しいナノ固溶合金を開発すると共に、革新的な触媒機能の創成を行う。超臨界ソルボサーマル連続フロー合成法により、多種金属元素を原子レベルで融合させ、新元素、新物質、新材料の探索を徹底的に行う。１）貴金属8元素からなるハイエントロピー固溶ナノ合金の作製、２）貴金属-卑金属12元素からなるハイエントロピー固溶ナノ合金の作製、３）貴金属-卑金属-軽元素16元素からなるハイエントロピー固溶ナノ合金の作製に挑戦する。さらに、プロセス・インフォマティクスの適用により、一気通貫型の革新的プロセス開発を行う。

    CiNii Research

  • 金属／酸化物ナノ粒子の瞬間同時合成手法の確立と革新的多元素複合ナノ材料の創製

    Grant number：25K01622 

    草田 康平

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    Grant type：Scientific research funding

    本研究では、「還元によって形成される金属ナノ粒子」と「酸化によって形成される酸化物ナノ粒子」の同時合成手法を確立することで革新的金属／酸化物複合ナノ材料を創製すること、およびその形成機構を解明し、複合材料の構造精密制御を行い、最終的には世界初の『多元素ナノ合金』×『多元素ナノ酸化物』複合ナノ材料の同時合成の達成と物性開拓を行う。具体的には超臨界還元剤水溶液を用いたフロー合成法を軸に複合ナノ材料を合成し、その反応機構や本合成手法による特異なナノ構造と物性の相関を原子分解能観察やin-situ測定を用いて調べる。

    CiNii Research

  • 多変量解析によるハイエントロピー合金（HEA）触媒の開発と超HEAナノ粒子の創製

    Grant number：21H01762 

    草田 康平

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    Grant type：Scientific research funding

    本提案では、多変量解析を用いた効率的な材料探索手法を基軸として、5元素以上が等モル比程度で混合した新しい合金種であるハイエントロピー合金（High-entropy alloy: HEA）ナノ粒子の革新的触媒開発に挑戦する。さらに、前人未到の20種類以上の元素が原子レベルで混ざりあった超ハイエントロピー合金（Ultra HEA: UHEA）ナノ粒子の実現を目指す。本研究開発により、高活性と高耐久性を有した触媒の開発や、従来のナノ合金では達成されなかった複雑な反応ステップを介する高難度反応を促進する触媒開発が行えると期待される。

    CiNii Research

  • 多元素超セラミックスの創製

    Grant number：25H01669 

    草田 康平

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    Grant type：Scientific research funding

    近年、多元素から成る複雑な物質系において、多様な元素が織りなすカクテル効果によって従来物質とは異なる魅力的な物性を示す新物質が多数創出されている。本研究では多元素化が超セラミックスにおいて新たな物性開拓の指針となり得るのか、多元素化によって結晶内外に介在する分子がどのように影響されるのか、という点を学術的な問いとして、多元素無機材料の超臨界フロー合成法を軸に計画班との協業することで、未踏物質である多元素超セラミックスの合成手法の開拓を行い、内圏型・外圏型多元素超セラミックスを創出し、その構造や触媒特性をはじめとした物性を調べる。

    CiNii Research