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
Collection year 2017
Language eng
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
HERDC Pre-Audit
Centre for Microscopy and Microanalysis Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 4 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Tue, 24 May 2016, 10:18:08 EST by System User on behalf of Materials