Impacts of Cu deficiency on the thermoelectric properties of Cu2-XSe nanoplates

Yang, Lei, Chen, Zhi-Gang, Han, Guang, Hong, Min and Zou, Jin (2016) Impacts of Cu deficiency on the thermoelectric properties of Cu2-XSe nanoplates. Acta Materialia, 113 140-146. doi:10.1016/j.actamat.2016.04.050


Author Yang, Lei
Chen, Zhi-Gang
Han, Guang
Hong, Min
Zou, Jin
Title Impacts of Cu deficiency on the thermoelectric properties of Cu2-XSe nanoplates
Formatted title
Impacts of Cu deficiency on the thermoelectric properties of Cu2-XSe nanoplates
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
1873-2453
Publication date 2016-07-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.actamat.2016.04.050
Open Access Status Not Open Access
Volume 113
Start page 140
End page 146
Total pages 7
Place of publication Kidlington, Oxford United Kingdom
Publisher Pergamon Press
Language eng
Subject 2504 Electronic, Optical and Magnetic Materials
2503 Ceramics and Composites
2507 Polymers and Plastics
2506 Metals and Alloys
Abstract Non-stoichiometric CuSe is one of important thermoelectric candidates for intermediate temperature applications with intrinsically high performance at 800-1000 K. In this study, Cu-deficient CuSe 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 CuSe can be induced by a relatively high level of Cu deficiency (CuSe) in the as-synthesized CuSe 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 CuSe 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 CuSe nanoplates showed a reduced ZT, such as 1.4 at 850 K for CuSe, it is still much higher than its bulk counterparts under the same temperature.
Formatted 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.

Keyword Copper selenide
Cu deficiency
Nanostructures
Thermoelectric materials
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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