Polycrystalline BiCuSeO oxide as a potential thermoelectric material

Fu Li, Jing Feng Li, Li Dong Zhao, Kai Xiang, Yong Liu, Bo Ping Zhang, Yuan Hua Lin, Ce Wen Nan, Hong Min Zhu

Research output: Contribution to journalArticlepeer-review

190 Citations (Scopus)

Abstract

This work revealed that BiCuSeO oxyselenide is a potential oxide-based thermoelectric material, whose dimensionless figure of merit (ZT) reaches ∼0.70 at 773 K. High phase-purity BiCuSeO polycrystalline materials with fine grains were synthesized by a facile method combining a solid-state reaction and spark plasma sintering. Purifying the constitutive phase and reducing the grain sizes by introducing a high-energy ball milling process before spark plasma sintering were found to be effective in property enhancement. The resultant single-phased BiCuSeO sample derived from ball-milled powders shows good electrical conductivity above 4.0 × 103 S m-1 and a large Seebeck coefficient above 200 μV K-1. This compound has a low thermal conductivity (∼0.5 W m-1 K-1), which is associated with its low phonon transport speed and Young's modulus. Results indicated that BiCuSeO-based materials are promising for energy conversion applications in the moderate temperature range.

Original languageEnglish
Pages (from-to)7188-7195
Number of pages8
JournalEnergy and Environmental Science
Volume5
Issue number5
DOIs
Publication statusPublished - 2012 May 1
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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