2023 Fiscal Year Annual Research Report
二機能性電極の相乗効果による電気化学的バイオマス再生と水素製造
| Project/Area Number |
22KF0204
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| Allocation Type | Multi-year Fund |
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| Research Institution | Kyoto University |
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Principal Investigator |
北川 宏 京都大学, 理学研究科, 教授 (90234244)
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| Co-Investigator(Kenkyū-buntansha) |
DENG XIAOHUI 京都大学, 理学研究科, 外国人特別研究員
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| Project Period (FY) |
2023-03-08 – 2024-03-31
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| Keywords | high-entropy materials / selenide / amorphous materials / crystalline materials / hydrogen evolution |
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| Outline of Annual Research Achievements |
The overall research is focused on the fabrication, structural elucidation and exploration of catalytic activities of amorphous and crystalline platinum-group metal (PGM) selenides.
A hot injection method was employed to prepare the selenides. The amorphous and crystalline selenides were obtained by modifying the preparation methods or thermal annealing. The amorphous and crystalline high-entropy PGM selenide with a single cubic phase was prepared for the first time. The crystallinity of monometallic selenides was also tuned. The materials were characterized by X-ray diffraction, electron microscopy, X-ray fluorescence spectroscopy, X-ray photon spectroscopy and other methods. The atomic coordination, short- and long-range order in amorphous and crystalline high-entropy selenides were systematically studied.
It was revealed that factors such as surfactant capping, precursor reactivity or nucleation/growth kinetics do not display significant roles toward amorphous structure. On the other hand, the multi-element composition contributes to the amorphous structure of high-entropy selenide probably due to various amorphous/crystalline structures of different PGM selenides. During its formation, the long-range order that could be present in the monometallic selenides is disturbed by the incorporation of other elements that favor disordered structure.
The amorphous HE-selenide exhibits superior acidic hydrogen evolution activity compared with monometallic selenides and also crystalline counterpart, demonstrating the advantages of high-entropy configuration and amorphous structure.
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