Realizing Bi-doped α-Cu2Se as a promising near-room- temperature thermoelectric material
Article
Article Title | Realizing Bi-doped α-Cu2Se as a promising near-room- temperature thermoelectric material |
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ERA Journal ID | 3854 |
Article Category | Article |
Authors | Liao, Wang-Wei (Author), Yang, Lei (Author), Chen, Jie (Author), Zhou, Da-Li (Author), Qu, Xian-Lin (Author), Zheng, Kun (Author), Han, Guang (Author), Zhou, Jia-Bei (Author), Hong, Min (Author) and Chen, Zhi-Gang (Author) |
Journal Title | Chemical Engineering Journal |
Journal Citation | 371, pp. 593-599 |
Number of Pages | 7 |
Year | 2019 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 1385-8947 |
1873-3212 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.cej.2019.04.081 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S1385894719308599 |
Abstract | Copper selenide (Cu2Se) has been extensively studied as an eco-friendly thermoelectric candidate owing to the outstanding thermoelectric performance of its high-temperature β-phase. In this study, we propose that α-Cu2Se is also a promising thermoelectric material at near-room-temperature. We synthesize nanostructured Cu2-xSe via a facile solvothermal method, and densify the samples using Spark Plasma Sintering to maintain the small grain sizes. Although the as-prepared α-Cu2Se has intrinsically low lattice thermal conductivity, its high Cu deficiency leads to a high carrier concentration, therefore, a low thermoelectric performance. As an electron donor, bismuth can effectively compress the Cu vacancies of the as-prepared α-Cu2Se and in turn reduce its carrier concentration from 4.1 × 1020 to 2.0 × 1020 cm−3 at room temperature, achieving a significantly enhanced power factor and a reduced carrier thermal conductivity. Consequently, a zT of 0.43 at 373 K is obtained in Cu1.982Bi0.006Se, showing great potential in developing high-performance near-room-temperature α-Cu2Se-based thermoelectric materials. |
Keywords | Copper selenide; Near-room-temperature; Thermoelectric; α-Phase |
ANZSRC Field of Research 2020 | 401699. Materials engineering not elsewhere classified |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Sichuan University, China |
Beijing University of Technology, China | |
Chongqing University, China | |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q7680/realizing-bi-doped-cu2se-as-a-promising-near-room-temperature-thermoelectric-material
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