Record high thermoelectric performance in bulk SrTiO3 via nano-scale modulation doping

Jun Wang, Bo Yu Zhang, Hui Jun Kang, Yan Li, Xinba Yaer, Jing Feng Li, Qing Tan, Shuai Zhang, Guo Hua Fan, Cheng Yan Liu, Lei Miao, Ding Nan, Tong Min Wang, Li Dong Zhao

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Strontium titanite (SrTiO3), which is an experimentally-friendly thermoelectric material, could be a promising candidate for thermoelectric power generation applications. The theorectical study indicates the co-doping of La and Nb could enhance the thermoelectric performance, however, the thermoelectric figure of merits (ZTs) of SrTiO3 are still low because the co-doping process at nano-scale is experimentally difficult to control. Here we report a high performance SrTiO3 with La-Nb co-doping, which are prepared by a combination of hydrothermal method and high-efficiency sintering. Nano-scale co-doping is successfully modulated by hydrothermal method, and nano-inclusions precipitate during sintering process, to form complex microstructures. In this case, the electrical and thermal transport properties are optimized simultaneously by doping concentration and dopants type, resulting in a record-high ZT >0.6 at 1000−1100 K in the 10 mol% La and 10 mol% Nb doped SrTiO3 bulk materials. The nano-scale modulation doping and microstructure controlling approach validated in the present study should be also applicable for other thermoelectric materials.

Original languageEnglish
Pages (from-to)387-395
Number of pages9
JournalNano Energy
Volume35
DOIs
Publication statusPublished - 2017 May 1
Externally publishedYes

Keywords

  • Cold isostatic pressing
  • Effective mass
  • Microstructure
  • Strontium titanate
  • Thermoelectric materials

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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    Wang, J., Zhang, B. Y., Kang, H. J., Li, Y., Yaer, X., Li, J. F., Tan, Q., Zhang, S., Fan, G. H., Liu, C. Y., Miao, L., Nan, D., Wang, T. M., & Zhao, L. D. (2017). Record high thermoelectric performance in bulk SrTiO3 via nano-scale modulation doping. Nano Energy, 35, 387-395. https://doi.org/10.1016/j.nanoen.2017.04.003