| Project/Area Number |
22KF0204
|
|---|
| Project/Area Number (Other) |
22F31328 (2022)
|
|---|
| Research Category |
Grant-in-Aid for JSPS Fellows
|
| Allocation Type | Multi-year Fund (2023)
Single-year Grants (2022) |
|---|
| Section | 外国 |
|---|
| Review Section |
Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
|
|---|
| Research Institution | Kyoto University |
|---|
Principal Investigator |
北川 宏 京都大学, 理学研究科, 教授 (90234244)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
DENG XIAOHUI 京都大学, 理学研究科, 外国人特別研究員
|
|---|
| Project Period (FY) |
2023-03-08 – 2024-03-31
|
| Project Status |
Completed (Fiscal Year 2023)
|
| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2023: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2022: ¥1,200,000 (Direct Cost: ¥1,200,000)
|
|---|
| Keywords | high-entropy materials / selenide / amorphous materials / crystalline materials / hydrogen evolution / nanoparticle / high-entropy alloy / electrochemistry |
|---|
| Outline of Research at the Start |
High-entropy materials significantly expand the materials library for various catalytic applications. In this research, the fabrication of novel high-entropy nanoparticles will be conducted and their atomic structure will be elucidated. To demonstrate the advantage of high-entropy configuration, the electrochemical activity towards energy-related applications will be investigated. This research is expected to guide the design of highly-efficient catalysts by exploiting the high-entropy configuration.
|
| 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.
|
