Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5458076 | Journal of Alloys and Compounds | 2018 | 19 Pages |
Abstract
Cu1.8S is a promising thermoelectric material with characteristics of superionic conductors. This study has been focused on the effect of Ti4+ doping on both electron and phonon transport properties of TixCu1.8-xS (x = 0, 0.04, 0.07, 0.10). The thermoelectric figure of merit (ZT) was greatly enhanced when 0.07 â¤Â x â¤Â 0.10, mainly due to a decreased thermal conductivity (0.62-0.77 Wmâ1Kâ1) caused by the formation of the lower-conductive Cu4(TiS4) and Cu1.96S second phases, and the introduced point defects. Along with an improved Seebeck coefficient, a peak ZT value of 0.54 at 673 K was obtained in the Ti0.07Cu1.73S composition, which is twice as large as that of the undoped one. A maximum efficiency of about 3.7% at Th = 673 K with a proper output power density (Pdâ¼0.56 Wcmâ2) was obtained. Our results indicate that the introduction of Ti4+ in copper sulfide thermoelectric materials is an effective and convenient strategy to improve ZT by decreasing thermal conductivity.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Dou-Dou Liang, Bo-Ping Zhang, Liang Zou,