Highly improved thermoelectric performance of Nb-doped SrTiO3 due to significant suppression of phonon thermal conduction by synergetic effects of pores and metallic nanoparticles. Issue 16 (November 2020)

• Record Type: Journal Article
• Authors: Hirata, Shinji; Ohtaki, Michitaka; Watanabe, Kosuke
• Is Part Of: Ceramics international. Volume 46:Issue 16(2020)Part A
• Page Start: 25964
• Page End: 25969
• Publication Date: 2020-11
• Subjects: Oxide thermoelectrics -- Nanocomposite -- Metallic nanoparticle -- Porous structure -- Phonon scattering; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.07.085
• Languages: English
• ISSNs: 0272-8842

Abstract

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 .