東晃太朗 (Kotaro Higashi) - マイポータル

基本情報

所属: 公益財団法人高輝度光科学研究センター

研究者番号: 70721249
ORCID iD: https://orcid.org/0000-0003-4434-430X
J-GLOBAL ID: 201301014004190825
researchmap会員ID: 7000005594

研究分野

エネルギー / 量子ビーム科学 /

論文

Cyclic Voltammetry–Synchronized Operando HERFD-XANES and RIXS Analyses of Adsorbed Structures and Bonding States of Active Oxygen Species on Pt Nanoparticle Electrocatalysts in PEFC

Hiroko Ariga-Miwa, Takehiko Sasaki, Tomohiro Sakata, Kotaro Higashi, Takefumi Yoshida, Oki Sekizawa, Takuma Kaneko, Tomoya Uruga, Yasuhiro Iwasawa

ACS Catalysis 9856-9869 2025年5月27日
<i>In situ</i> Study on Structure of a Diluted Pt/HOPG Model Catalyst System Prepared by the Two-phase Liquid Reduction Method Using a Novel BCLA/HERFD+BI-XAFS Method

Kaiyue Dong, Bing Hu, Md Harun Al Rashid, Bang Lu, Keiko Miyabayashi, Kotaro Higashi, Tomoya Uruga, Yasuhiro Iwasawa, Daiki Kido, Satoru Takakusagi …

e-Journal of Surface Science and Nanotechnology 2024年2月15日
Roles of structural defects in polycrystalline platinum nanowires for enhanced oxygen reduction activity

Xiao Zhao, Shinobu Takao, Yusuke Yoshida, Takuma Kaneko, Takao Gunji, Kotaro Higashi, Tomoya Uruga, Yasuhiro Iwasawa

Applied Catalysis B: Environmental 324 122268-122268 2023年5月5日査読有り
Emergence of Dynamically‐Disordered Phases During Fast Oxygen Deintercalation Reaction of Layered Perovskite

Takafumi Yamamoto, Shogo Kawaguchi, Taiki Kosuge, Akira Sugai, Naoki Tsunoda, Yu Kumagai, Kosuke Beppu, Takuya Ohmi, Teppei Nagase, Kotaro Higashi …

Advanced Science 2023年4月25日査読有り
Application of High-Energy-Resolution X-ray Absorption Spectroscopy at the U L₃-Edge to Assess the U(V) Electronic Structure in FeUO₄

Takumi Yomogida, Daisuke Akiyama, Kazuki Ouchi, Yuta Kumagai, Kotaro Higashi, Yoshihiro Kitatsuji, Akira Kirishima, Naomi Kawamura, Yoshio Takahashi

Inorganic Chemistry 61(50) 20206-20210 2022年12月19日査読有り
Variation of Local Structure and Reactivity of Pt/C Catalyst for Accelerated Degradation Test of Polymer Electrolyte Fuel Cell Visualized by Operando 3D CT‐XAFS Imaging

Hirosuke Matsui, Nozomu Ishiguro, Yuanyuan Tan, Naoyuki Maejima, Yuta Muramoto, Tomoya Uruga, Kotaro Higashi, Duong‐Nguyen Nguyen, Hieu‐Chi Dam, Gabor Samjeské …

ChemNanoMat 8(4) 2022年3月8日査読有り
Reaction product-driven restructuring and assisted stabilization of a highly dispersed Rh-on-ceria catalyst

George Yan, Yu Tang, Yuting Li, Yixiao Li, Luan Nguyen, Tomohiro Sakata, Kotaro Higashi, Franklin Feng Tao, Philippe Sautet

Nature Catalysis 5(2) 119-127 2022年2月24日査読有り
Operando Imaging of Ce Radical Scavengers in a Practical Polymer Electrolyte Fuel Cell by 3D Fluorescence CT-XAFS and Depth-Profiling Nano-XAFS-SEM/EDS Techniques

Hirosuke Matsui, Shinobu Takao, Kotaro Higashi, Takuma Kaneko, Gabor Samjeské, Tomoya Uruga, Mizuki Tada, Yasuhiro Iwasawa

ACS Applied Materials and Interfaces 14(5) 6762-6776 2022年2月9日査読有り
Abnormal Metal Bond Distances in PtAu Alloy Nanoparticles: In Situ Back-Illumination XAFS Investigations of the Structure of PtAu Nanoparticles on a Flat HOPG Substrate Prepared by Arc Plasma Deposition

Bing Hu, Bapurao Bharate, Juan D. Jimenez, Jochen Lauterbach, Naoto Todoroki, Toshimasa Wadayama, Kotaro Higashi, Tomoya Uruga, Yasuhiro Iwasawa, Hiroko Ariga-Miwa …

Journal of Physical Chemistry C 126(2) 1006-1016 2022年1月20日査読有り
Structural Transformation of Pt–Ni Nanowires as Oxygen Reduction Electrocatalysts to Branched Nanostructures during Potential Cycles

Masaru Kato, Yoshimi Iguchi, Tianchi Li, Yuta Kato, Yu Zhuang, Kotaro Higashi, Tomoya Uruga, Takahiro Saida, Keiko Miyabayashi, Ichizo Yagi

ACS Catalysis 12(1) 259-264 2022年1月7日査読有り
Single-Atom High-Temperature Catalysis on a Rh₁O₅ Cluster for Production of Syngas from Methane

Yu Tang, Victor Fung, Xiaoyan Zhang, Yuting Li, Luan Nguyen, Tomohiro Sakata, Kotaro Higashi, De-en Jiang, Franklin Feng Tao

Journal of the American Chemical Society 143(40) 16566-16579 2021年10月13日査読有り
Synthesis of catalysts with fine platinum particles supported by high-surface-area activated carbons and optimization of their catalytic activities for polymer electrolyte fuel cells

Md. Mijanur Rahman, Kenta Inaba, Garavdorj Batnyagt, Masato Saikawa, Yoshiki Kato, Rina Awata, Byambasuren Delgertsetsega, Yasuo Kaneta, Kotaro Higashi, Tomoya Uruga …

RSC Advances 11(33) 20601-20611 2021年6月8日査読有り
In Situ X-ray Absorption Spectroscopy to Monitor the Degradation of Fe/N/C Cathode Catalyst in Proton Exchange Membrane Fuel Cells

Y. Nabae, Q. Yuan, S. Nagata, K. Kusaba, T. Aoki, N. Takao, T. Itoh, M. Arao, H. Imai, K. Higashi …

Journal of The Electrochemical Society 168(1) 014513-014513 2021年1月1日査読有り
Oxygen Reduction Reaction Performance Tuning on Pt Nanoparticle/MWCNT Catalysts by Gd Species

Kentaro Ichihashi, Satoshi Muratsugu, Hirosuke Matsui, Kotaro Higashi, Oki Sekizawa, Tomoya Uruga, Mizuki Tada

The Journal of Physical Chemistry C 124(49) 26925-26936 2020年12月10日査読有り
Visualization and understanding of the degradation behaviors of a PEFC Pt/C cathode electrocatalyst using a multi-analysis system combining time-resolved quick XAFS, three-dimensional XAFS-CT, and same-view nano-XAFS/STEM-EDS techniques

Kotaro Higashi, Shinobu Takao, Gabor Samjeské, Hirosuke Matsui, Mizuki Tada, Tomoya Uruga, Yasuhiro Iwasawa

Physical Chemistry Chemical Physics 22(34) 18919-18931 2020年9月8日査読有り筆頭著者
Electronic Effects of Nitrogen Atoms of Supports on Pt–Ni Rhombic Dodecahedral Nanoframes for Oxygen Reduction

Masaru Kato, Ryota Nakahoshiba, Kazuya Ogura, Shoichi Tokuda, Satoshi Yasuda, Kotaro Higashi, Tomoya Uruga, Yohei Uemura, Ichizo Yagi

ACS Applied Energy Materials 3(7) 6768-6774 2020年7月27日査読有り
Plasma-Devised Pt/C Model Electrodes for Understanding the Doubly Beneficial Roles of a Nanoneedle-Carbon Morphology and Strong Pt-Carbon Interface in the Oxygen Reduction Reaction

Xiao Zhao, Yutaka Hamamura, Yusuke Yoshida, Takuma Kaneko, Takao Gunji, Shinobu Takao, Kotaro Higashi, Tomoya Uruga, Yasuhiro Iwasawa

ACS Applied Energy Materials 3(6) 5542-5551 2020年6月22日査読有り
Feed gas exchange (startup/shutdown) effects on Pt/C cathode electrocatalysis and surface Pt-oxide behavior in polymer electrolyte fuel cells as revealed using in situ real-time XAFS and high-resolution STEM measurements

Gabor Samjeské, Takuma Kaneko, Takao Gunji, Kotaro Higashi, Tomoya Uruga, Mizuki Tada, Yasuhiro Iwasawa

Physical Chemistry Chemical Physics 22(17) 9424-9437 2020年5月6日査読有り
Electrochemical Properties and Single Cell Performance of Pd Core-Pt Shell Structured Catalyst Synthesized by a Simple Direct Displacement Reaction

Naoya Aoki, Hideo Inoue, Reiko Yoshiura, Yuya Hasegawa, Shunya Miyazaki, Ayono Suzuki, Hideo Daimon, Takayuki Doi, Minoru Inaba, Kotaro Higashi …

Journal of The Electrochemical Society 167(4) 044513-044513 2020年2月20日査読有り
Evidence for interfacial geometric interactions at metal–support interfaces and their influence on the electroactivity and stability of Pt nanoparticles

Xiao Zhao, Takao Gunji, Takuma Kaneko, Shinobu Takao, Tomohiro Sakata, Kotaro Higashi, Yusuke Yoshida, Junjie Ge, Changpeng Liu, Wei Xing …

Journal of Materials Chemistry A 8(3) 1368-1377 2020年1月22日査読有り

もっとみる

MISC

固体高分子形燃料電池カソードPt/C触媒粒子表面の吸着酸素種/硫黄種のin situ硬X線発光分光計測

宇留賀朋哉, 宇留賀朋哉, 三輪寛子, 吉田健文, 金子拓真, 佐々木岳彦, 東晃太朗, 坂田智裕, 関澤央輝, 関澤央輝 …

応用物理学会秋季学術講演会講演予稿集(CD-ROM) 83rd 2022年
高エネルギー分解XANES法による固体高分子形燃料電池Pt/Cカソード触媒粒子表面の吸着種観察

坂田智裕, 東晃太朗, 金子拓真, 関澤央輝, 関澤央輝, 田口宗孝, 朝倉清高, 宇留賀朋哉, 宇留賀朋哉, 岩澤康裕

日本放射光学会年会・放射光科学合同シンポジウム(Web) 32nd 2019年
In-situ発光分光計測法による固体高分子形燃料電池Pt/C触媒ナノ粒子表面の吸着化学種の観察

坂田智裕, 宇留賀朋哉, 宇留賀朋哉, 関澤央輝, 関澤央輝, 東晃太朗, 金子拓真, 朝倉清高, 岩澤康裕

日本化学会春季年会講演予稿集(CD-ROM) 98th 2018年
発光分光を用いた固体高分子型燃料電池におけるPt触媒の電子状態観察

坂田智裕, 宇留賀朋哉, 宇留賀朋哉, 関澤央輝, 関澤央輝, 東晃太朗, 金子拓真, 田口宗孝, 朝倉清高, 岩澤康裕

日本放射光学会年会・放射光科学合同シンポジウム(Web) 31st 2018年
MOF由来の酸化チタンクラスターと各種層状物質から成る新規層状複合体の開発と触媒反応への応用

吉田祐介, 趙暁, 郡司貴雄, GABOR Samjeske, 金子拓真, 鷹尾忍, 東晃太朗, 関澤央輝, 坂田智裕, 宇留賀朋哉 …

触媒討論会討論会A予稿集 120th 2017年
固体高分子形燃料電池Pt/C触媒の電子状態観察に向けたin-situ発光分光計測システムの開発

坂田智裕, 関澤央輝, 宇留賀朋哉, 宇留賀朋哉, 東晃太朗, 田口宗孝, 岩澤康裕

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年
固体高分子形燃料電池Pt/C触媒の電子状態観察に向けたin-situ発光分光計測システム

坂田智裕, 関澤央輝, 関澤央輝, 宇留賀朋哉, 宇留賀朋哉, 東晃太朗, 田口宗孝, 岩澤康裕

応用物理学会春季学術講演会講演予稿集(CD-ROM) 64th 2017年
2D spatial mapping of Pt chemical species in Pt/C cathode catalysts in polymer electrolyte fuel cells by a nano-beam XAFS technique

Shinobu Takao, Oki Sekizawa, Shin-ichi Nagamatsu, Takuma Kaneko, Takashi Yamamoto, Kotaro Higashi, Gabor Samjeske, Kensaku Nagasawa, Tomoya Uruga, Yasuhiro Iwasawa

ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 248 2014年8月
Origin and mechanism of Pt/C cathode catalyst degradation in polymer electrolyte fuel cell by anode gas exchange cycles studied by in situ time-resolved XAFS

Kotaro Higashi, Gabor Samjeske, Shinobu Takao, Shin-ichi Nagamatsu, Kensaku Nagasawa, Oki Sekizawa, Takuma Kaneko, Tomoya Uruga, Yasuhiro Iwasawa

ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 248 2014年8月
In situ時間分解XAFSを用いた固体高分子形燃料電池におけるアノードガス交換によるPt/Cカソード電極触媒劣化の観察

東晃太朗, SAMJESKE Gabor, 鷹尾忍, 永松伸一, 長澤兼作, 関澤央輝, 金子拓真, 今泉吉明, 宇留賀朋哉, 宇留賀朋哉 …

応用物理学会春季学術講演会講演予稿集(CD-ROM) 61st 2014年

共同研究・競争的資金等の研究課題

高時間分解能HERFD-QXAFS法の構築とin-situ/operand計測への展開

日本学術振興会科学研究費助成事業基盤研究(C) 基盤研究(C) 2023年4月 - 2026年3月

東晃太朗
固体高分子形燃料電池の起動停止過程その場３次元空間観察による触媒劣化機構の解明

日本学術振興会科学研究費助成事業若手研究(B) 若手研究(B) 2015年4月 - 2017年3月

東晃太朗