| 研究課題/領域番号 |
22F31328
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| 配分区分 | 補助金 |
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| 研究機関 | 京都大学 |
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研究代表者 |
北川 宏 京都大学, 理学研究科, 教授 (90234244)
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| 研究分担者 |
DENG XIAOHUI 京都大学, 理学研究科, 外国人特別研究員
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| 研究期間 (年度) |
2022-07-27 – 2024-03-31
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| キーワード | nanoparticle / high-entropy alloy / electrochemistry |
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| 研究実績の概要 |
High-entropy alloy nanoparticles consisting of Pd, Ru, Ni, Co and Cu have been prepared by hot injection of metal precursors into oleylamine at 320 degrees C. The XRD pattern shows FCC phase while the STEM images show the heterogenous distribution of PdCu and RuNiCo in one single nanoparticle. This might be due to the different reduction speeds of metal precursors.
High-entropy selenide of platinum-group metals has been prepared by hot injection of metal precursors into trimethylene glycol at 230 degrees C with polyvinylpyrrolidone as the surfactant. The XRD pattern shows that the selenide prepared exhibits an amorphous structure and the STEM confirms the absence of ordered crystal lattices. The elemental mapping shows the homogeneous distribution of Ru, Rh, Pd, Ir, Pt and Se in the nanoparticles.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The applicant has conducted systematic research on the synthesis of high-entropy alloy nanoparticles and high-entropy selenide nanostructures by the hot injection method. The synthesized materials have been characterized by transmission electron microscopy, X-ray fluorescence spectroscopy, and synchrotron-based X-ray absorption spectroscopy. In particular, the high-entropy selenide material shows a unique amorphous structure with the homogeneous distribution of platinum-group metals including Ru, Rh, Pd, Ir, and Pt. The XANES results show the positive valence states of the metals and the EXAFS results demonstrate similar M-Se coordination, which confirms the same chemical environments of elements.
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| 今後の研究の推進方策 |
The synthesized high-entropy materials will be loaded on carbon or oxide supports and the electrochemical activity towards various reactions such as hydrogen evolution reaction, oxygen reduction reaction, oxygen evolution reaction and alcohol oxidation reaction will be investigated. In addition, the electrochemical performance will be compared with monometallic counterparts in order to demonstrate the potential advantage of high-entropy configuration. Annealing treatment will then be applied to obtain crystalline selenides from the transformation of amorphous selenides and the electrochemical performance will be compared accordingly. The crystallization process will be studied by in-situ X-ray diffraction experiments.
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