Ultrafast Synthesis of Te-Doped CoSb3 with Excellent Thermoelectric Properties

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

1 Scopus Citations
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Author(s)

  • Ying Lei
  • Wensheng Gao
  • Rui Zheng
  • Yu Li
  • Wen Chen
  • Libo Zhang
  • Rundong Wan
  • Hongwei Zhou
  • Zhiyuan Liu

Detail(s)

Original languageEnglish
Pages (from-to)4477-4485
Journal / PublicationACS Applied Energy Materials
Volume2
Issue number6
Early online date23 May 2019
Publication statusPublished - 24 Jun 2019

Abstract

An efficient technique to prepare high-ZT skutterudites is described. Nearly single-phase Te-doped CoSb3-xTex ingots are synthesized by microwave processing for 5 min, and materials with 98% relative density are produced after spark plasma sintering for 5 min. The phase composition, grain size, and microstructure are studied, and the electrical and thermal transport mechanisms are examined systematically. In addition, the phonon scattering mechanism is examined. Our results show that 5-10 mol % Te is desirable for CoSb3-xTex, and the power factors can be maximized by balancing the Seebeck coefficient and conductivity. Abundant edge and screw dislocations are observed, and an ultralow lattice thermal conductivity of 1.04 W m-1 K-1 is observed from CoSb2.95Te0.05 at 773 K on account of the combined effects of boundary and dislocation scattering. CoSb2.95Te0.5 shows the highest ZT of 1.06 at 773 K, and even larger values can be achieved at a higher temperature. The preparation technique described here has many advantages associated with the properties and efficiency and great potential in the research and production of TE materials.

Research Area(s)

  • CoSb3-based skutterudites, microwave synthesis, boundary scattering, lattice dislocation, power factor, lattice thermal conductivity

Citation Format(s)

Ultrafast Synthesis of Te-Doped CoSb3 with Excellent Thermoelectric Properties. / Lei, Ying; Gao, Wensheng; Zheng, Rui; Li, Yu; Chen, Wen; Zhang, Libo; Wan, Rundong; Zhou, Hongwei; Liu, Zhiyuan; Chu, Paul K.

In: ACS Applied Energy Materials, Vol. 2, No. 6, 24.06.2019, p. 4477-4485.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review