Suppression of bipolar transport and enhanced zT values of porous ZnSb by addition of hydrothermally synthesized Sb

Yu Hsien Chu, Zhi Quan Huang, Zong Ren Yang, Fei Hung Lin, Kuo Chuan Chang, R. Suriakarthick, Chia Jyi Liu

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ZnSb is a favourable eco-friendly, earth abundant SIand low cost thermoelectric material. We herein report a feasible approach to improve the thermoelectric performance of ZnSb by compositing with hydrothermally synthesized Sb. A series of ZnSb/Sb composites was fabricated by mixing the host material ZnSb and hydrothermally synthesized Sb followed by consolidation using cold pressing and evacuating-and-encapsulating sintering at 530 °C for 3 h. As compared to the host ZnSb, both the electrical resistivity and thermopower decrease, while both the power factor and thermal conductivity increase upon compositing with Sb. The bipolar transport of ZnSb is suppressed at temperatures up to 600 K. As a result, the ZnSb-Sb composite with 4 wt.% of hydrothermally synthesized Sb has a zT = 1.18 at 600 K, which is one of the highest values for ZnSb-based material and is about 46% enhancement as compared to the host ZnSb having zT = 0.81 at 600 K.

Original languageEnglish
Pages (from-to)4177-4183
Number of pages7
JournalJournal of the European Ceramic Society
Issue number14
Publication statusPublished - 2019 Nov


All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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