Impacts of Cu deficiency on the thermoelectric properties of Cu2-XSe nanoplates
Article
Article Title | Impacts of Cu deficiency on the thermoelectric properties of Cu2-XSe nanoplates |
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ERA Journal ID | 4742 |
Article Category | Article |
Authors | Yang, Lei (Author), Chen, Zhi-Gang (Author), Han, Guang (Author), Hong, Min (Author) and Zou, Jin (Author) |
Journal Title | Acta Materialia |
Journal Citation | 113, pp. 140-146 |
Number of Pages | 7 |
Year | 2016 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 1359-6454 |
1873-2453 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.actamat.2016.04.050 |
Abstract | Non-stoichiometric Cu2-xSe is one of important thermoelectric candidates for intermediate temperature applications with intrinsically high performance at 800-1000 K. In this study, Cu-deficient Cu2-xSe nanoplates were synthesized by a facile and controllable solvothermal method and the impact of Cu deficiency on their corresponding thermoelectric performance was systematically investigated. It has been found that α-phased Cu2-xSe can be induced by a relatively high level of Cu deficiency (Cu1.95Se) in the as-synthesized Cu2-xSe nanoplates at room temperature. The Cu deficiency was also found to reduce the thermoelectric performances, but had no significant impact to the morphology of as-synthesized products. Overall, with the existence of full-spectrum phonon scattering mechanism benefited from the nanostructuring, the stoichiometric Cu2Se nanoplates showed an outstanding ZT of 1.82 at ∼850 K due to its significantly reduced thermal conductivity. With increasing the Cu deficiency, although the Cu2-xSe nanoplates showed a reduced ZT, such as 1.4 at 850 K for Cu1.98Se, it is still much higher than its bulk counterparts under the same temperature. |
Keywords | copper selenide; Cu deficiency; nanostructures; thermoelectric materials |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Queensland |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4149/impacts-of-cu-deficiency-on-the-thermoelectric-properties-of-cu2-xse-nanoplates
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