Strategy of Extra Zr Doping on the Enhancement of Thermoelectric Performance for TiZrxNiSn Synthesized by a Modified Solid-State Reaction

Jun Liang Chen, Hengquan Yang, Chengyan Liu, Jisheng Liang, Lei Miao, Zhongwei Zhang, Pengfei Liu, Kenta Yoshida, Chen Chen, Qian Zhang, Qi Zhou, Yuntiao Liao, Ping Wang, Zhixia Li, Biaolin Peng

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Half-Heusler alloys, which possess the advantages of high thermal stability, a large power factor, and good mechanical property, have been attracting increasing interest in mid-temperature thermoelectric applications. In this work, extra Zr-doped TiZrxNiSn samples were successfully prepared by a modified solid-state reaction followed by spark plasma sintering. It demonstrates that extra Zr doping could not only improve the power factor on account of an increase in the Seebeck coefficient but also suppress the lattice thermal conductivity originated from the strengthened phonon scattering by the superlattice nanodomains and the secondary nanoparticles. As a consequence, an increased power factor of 3.29 mW m-1 K-2 and a decreased lattice thermal conductivity of 1.74 W m-1 K-1 are achieved in TiZr0.015NiSn, leading to a peak ZT as high as 0.88 at 773 K and an average ZT value up to 0.62 in the temperature range of 373-773 K. This work gives guidance for optimizing the thermoelectric performance of TiNiSn-based alloys by modulating the microstructures on the secondary nanophases and superlattice nanodomains.

Original languageEnglish
Pages (from-to)48801-48809
Number of pages9
JournalACS Applied Materials and Interfaces
Volume13
Issue number41
DOIs
Publication statusPublished - 2021 Oct 20

Keywords

  • extra Zr-doped TiNiSn
  • half-Heusler
  • phonon scattering
  • solid-state reaction
  • superlattice nanodomains
  • thermoelectric

ASJC Scopus subject areas

  • Materials Science(all)

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