Enhanced thermoelectric properties of CoSb3-based skutterudites by filling Se as electronegative element
Year: 2018
Type: article
Abstract: Filling electronegative guests into CoSb 3 -based skutterudites has been regarded as a promising way to improve their electrical and thermal transport properties. In this study, a series of Se y Co 4- x Pd x Sb 12-2 y Se 2 y compounds have been prepared by traditional solid state reaction methods. Se as electronegative element was introduced into both the voids and the Sb sites of CoSb 3 -based skutterudite, and Pd was further introduced to stabilize Se in the voids. The phase compositions and electrical and thermal transport properties of the compounds have been investigated and the related mechanisms were explored. It is found that the forming of thermodynamically stable compounds is due to the charge compensation between the Pd and Se. By balancing the effect of the decrease of κ L and the decrease of σ , the zT of Se 0.2 Co 3.7 Pd 0.3 Sb 11.6 Se 0.4 sample amounted up to 0.88. With Te introduced into Se 0.2 Co 3.7 Pd 0.3 Sb 11.6 Se 0.4 sample, the filling fraction of Se indeed increase by the charge-compensation effect of Pd and Te. And the zT of Se 0.2 Co 3.7 Pd 0.3 Te 0.2 Sb 11.4 Se 0.4 sample was further improved to about 0.9.
Source: Materials Research Express
Authors: Xin Bao, Zihua Wu, Huaqing Xie
Institution: Shanghai Polytechnic University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2898813505