Evaluation of SrTi 1-xCo xO 3 perovskites (0 ≤ × ≤ 0.2) as interconnect materials for solid oxide fuel cells

Masashi Mori, Zhenwei Wang, Nobuyuki Serizawa, Takanori Itoh

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Abstract

The compatibility of SrTi 1-xCo xO 3 perovskites (0 ≤ × ≤ 0.2) was evaluated for use as interconnect materials in solid oxide fuel cells (SOFCs). Although SrTi 1-xCo xO 3 perovskites have a single perovskite phase in the range of 0 ≤ × ≤ 0.2, it was observed for SrTi 0.8Co 0.2O 3 that Co element agglomerated at the grain boundary during sintering. The dense SrTi 0.8Co 0.2O 3 sample was destroyed and included Sr 2TiO 4 as a secondary phase after reducing treatment at 1000°C. As a result of Co doping, the linear thermal expansion coefficient (TEC) increased remarkably with increasing Co content, but the TEC of SrTi 0.9Co 0.1O 3 was comparable with those of SOFC cathodes and anodes. Co doping of SrTiO 3 effectively increased electrical conductivity in air, whereas the conductivity of Co-doped SrTiO 3 in a reducing atmosphere was much lower than that in air. This suggests that the Co ions 3+/4+ in the perovskites were earlier reduced into Co 2+ ions, compared to Ti 4+ ions.

Original languageEnglish
JournalJournal of Fuel Cell Science and Technology
Volume8
Issue number5
DOIs
Publication statusPublished - 2011 Dec 1

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Keywords

  • Electrical conductivity
  • Interconnect
  • SOFC
  • Srtio
  • Thermal expansion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Mechanical Engineering

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