2021 Fiscal Year Final Research Report
Creation of new sulfide thermoelectric material composed of non-toxic and abundant elements
| Project/Area Number |
19K04362
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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 21010:Power engineering-related
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| Research Institution | Tsuyama National College of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
赤木 洋二 都城工業高等専門学校, 電気情報工学科, 准教授 (10321530)
奥山 哲也 久留米工業高等専門学校, 材料システム工学科, 教授 (40270368)
荒木 秀明 長岡工業高等専門学校, 物質工学科, 教授 (40342480)
瀬戸 悟 石川工業高等専門学校, 電気工学科, 教授 (50216545)
山口 利幸 和歌山工業高等専門学校, 電気情報工学科, 教授 (60191235)
志賀 信哉 新居浜工業高等専門学校, 環境材料工学科, 教授 (60235512)
加藤 岳仁 小山工業高等専門学校, 機械工学科, 教授 (90590125)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 熱発電素子 / 硫化銅スズ / 銀 / 固溶体 / 圧力 / 熱電材料 / 熱電素子 / 銅硫化物 |
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| Outline of Final Research Achievements |
We focused on copper tin trisulfide (Cu2SnS3: CTS), which does not contain rare or toxic elements, as an alternative thermoelectric material to conventional Bi-Te, and aimed to improve thermoelectric performance by applying pressure (chemical pressure) to the lattice by adding a small amount of an isoelectronic element (silver of the same group as copper) with a large ionic radius. Initially, the addition of silver reduced the electrical conductivity and, as a result, did not improve the thermoelectric performance. Therefore, we attempted to optimize the amount of silver added and found that a raw material Ag/(Cu+Ag) of about 0.01 was sufficient. Furthermore, we can improve the electrical conductivity by mixing and sintering raw materials with different amounts of silver and indium, and finally have obtained a figure of merit ZT of about 0.3 at 300 degree C.
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| Free Research Field |
電気電子材料
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| Academic Significance and Societal Importance of the Research Achievements |
希少元素や有毒元素を含まないCTSに着目し，化学圧力による熱電性能の向上に取り組んだ．本研究の成果の学術的意義は，従来方法より簡便な方法によっても同等な性能を得ることができたことである．そのことによって作成コストを軽減することができ実用化という社会的意義に向けて一歩踏み出せたと考えている．
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