Enhanced thermoelectric property in superionic conductor Bi-doped Cu1.8S

Dou Dou Liang, Zhen Hua Ge, He Zhang Li, Bo Ping Zhang*, Fu Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

We report the effect of Bi3+ doping on both electron and phonon transport properties of BixCu1.8-xS (x = 0, 0.004, 0.01, 0.014, 0.02) superionic conductors. An enhanced ZT value in different degrees with x is mainly attributed to an improved electrical conductivity owing to an increased carrier mobility with an undegrated Seebeck coefficient when 0 ≤ x ≤ 0.01, and a reduced thermal conductivity to a low level (0.71–1.00 Wm−1K−1) at x = 0.02 benefiting by the formation of the low-conductive Cu3BiS3 and Cu1.96S second phases. The highest ZT value of 0.61 at 673 K obtained for the Bi0.01Cu1.79S (x = 0.01) sample, which is twice as large as that of the pure Cu1.8S sample. Our result indicates that the introduction of Bi3+ in thermoelectric materials is an effective and convenient strategy to improve ZT by improving the power factor and/or decreasing thermal conductivity.

Original languageEnglish
Pages (from-to)169-174
Number of pages6
JournalJournal of Alloys and Compounds
Volume708
DOIs
Publication statusPublished - 2017
Externally publishedYes

Keywords

  • Bi doping
  • CuS
  • Superionic
  • Thermoelectric

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