2022 Fiscal Year Research-status Report
Disordered-ordered structure transition in co-sputtered solid solution nanoparticles and its impact on catalytic properties
| Project/Area Number |
22K04852
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| Research Institution | Hokkaido University |
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Principal Investigator |
グエン タンマイ 北海道大学, 工学研究院, 助教 (00730649)
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Keywords | solid solution alloy / intermetallics / nanoparticles / AgPt / structure transition / ORR / Pt alloy / co-sputter deposition |
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| Outline of Annual Research Achievements |
Bimetallic AgPt with various compositions were prepared by cosputter deposition. Substrates including liquid polyethylene glycol, solid substrate, and transmission electron microscope (TEM) grids were used. The sputter conditions were studied to obtain equimolar AgPt alloy. The structure and composition analysis confirmed the formation of solid solution alloy. Besides, trimetal alloy nanoparticles (AgPtCu) were synthesized.
The catalytic performance in oxygen reduction reaction (ORR) were evaluated for tri- and bi-metal alloy nanoparticles and sputtered Pt nanoparticles. AgPt was found to outperform others. The improvement was thought to arise from the stable structure of AgPt and the formation of AgPt alloy.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
The PI took maternity and childcare leaves in 2022 (April 2022, partially in August-September), and from October 2022 to March 2023. Therefore the research progress in FY 2022 was somehow delayed compared with the original plan.
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| Strategy for Future Research Activity |
For FY 2023: the disordered-ordered structure transition of AgPt will be examined for different particle size and under different gaseous environment. Moreover, composition dependence of disordered-ordered structure transition will be studied this year.
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| Causes of Carryover |
Because I took the maternity and childcare leave in FY 2022, the research was not progressed with full time and grant for FY 2022 was not used up. The left amount of the budget for FY 2022 was transferred to the next year for the research. Two metal targets is planed to be purchased in FY 2023. High-resolution TEM grids will also be purchased for analysis of the samples.
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