Yang, Lei and Chen, Zhi-Gang and Han, Guang and Hong, Min and Zou, Jin (2016) Impacts of Cu deficiency on the thermoelectric properties of Cu2-XSe nanoplates. Acta Materialia, 113. pp. 140-146. ISSN 1359-6454
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.
|
Statistics for this ePrint Item |
| Item Type: | Article (Commonwealth Reporting Category C) |
|---|---|
| Refereed: | Yes |
| Item Status: | Live Archive |
| Additional Information: | Permanent restricted access to Published version in accordance with the copyright policy of the publisher. |
| Faculty / Department / School: | No Faculty |
| Date Deposited: | 13 Jun 2017 02:49 |
| Last Modified: | 27 Jun 2017 06:29 |
| Uncontrolled Keywords: | copper selenide; Cu deficiency; nanostructures; thermoelectric materials |
| Fields of Research : | 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials |
| Identification Number or DOI: | 10.1016/j.actamat.2016.04.050 |
| URI: | http://eprints.usq.edu.au/id/eprint/31665 |
Actions (login required)
 |
Archive Repository Staff Only |