2022 Fiscal Year Final Research Report
Preparation of Thermoelectric Conversion Films by Electrodeposition Method in Non-aqueous Solution
| Project/Area Number |
19K05111
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 26060:Metals production and resources production-related
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| Research Institution | University of Hyogo |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 非水溶液電解 / 熱電変換材料 / 電析 / 溶融塩 / 鉄-アルミニウム合金 / 亜鉛-アンチモン合金 |
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| Outline of Final Research Achievements |
The reduction behavior of Fe ion and Al ion in AlCl3-NaCl-KCl-FeCl2 quaternary chloride molten salts was investigated, and the relationships between the electrolytic conditions, the composition of the electrodeposit, and their thermoelectric properties were clarified. It was confirmed that the change in the sign of Seebeck coefficient within the composition range where Al and Fe form solid solutions, and this is due to the change in the electronic structure of the material. We also investigated the deposition behavior of Zn-Sb alloys in non-aqueous solutions of ethylene glycol (EG)-ZnCl2-SbCl3 and clarified the relationship between the bath composition, electrolysis conditions, and the composition of the Zn-Sb alloys. The Zn-Sb alloys with p-type thermoelectric conversion function could be prepared.
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| Free Research Field |
物理化学，電気化学
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| Academic Significance and Societal Importance of the Research Achievements |
熱電変換デバイスはp型およびn型熱電変換材料を交互に接続して構成されるため，薄膜状の熱電変換材料を用いて熱電変換デバイスを構成すれば軽量化・高容量化が期待できる．本研究は，Fe-Al系およびZn-Sb系熱電変換材料を電析法により薄膜として作製する条件を明らかにした．Fe-Al合金電析では，組成を制御することでp型やn型の特性をもつ材料をどちらも作製でき，Zn-Sb合金電析では性能が高いことで知られるZn4Sb3を得ることができる条件を明らかにした．薄膜構造を活かした安価な熱電変換デバイスの創成が期待できる成果が得られたと考える．
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