Highly improved thermoelectric performance of Nb-doped SrTiO3 due to significant suppression of phonon thermal conduction by synergetic effects of pores and metallic nanoparticles

Shinji Hirata, Michitaka Ohtaki, Kosuke Watanabe

Research output: Contribution to journalArticle

Abstract

A remarkable thermoelectric performance in oxide materials was achieved by Nb and Ni co-doped strontium titanate (STNNO) containing pores and Ni nanoparticles. A combined structure of macroporus matrix and the Ni nanoparticles was realized by an exsolution reaction of metallic Ni from the porous STNNO matrix. The porous nanocomposite structure led to a substantial decrease in the thermal conductivity down to 1.4 W m−1 K−1 at 800 °C, and a moderate improvement of the electrical properties. As a result, the porous nanocomposite structure containing the metallic Ni nanoparticles significantly decreased the phonon thermal conductivity to 0.91 W m−1 K−1 at 800 °C, resulting in a remarkable ZT of 0.60 at 800 °C for STNNO reduced in 20% H2/N2.

Original languageEnglish
JournalCeramics International
DOIs
Publication statusAccepted/In press - 2020

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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