The compatibility of SrTi1−xCoxO3 perovskites (0 ≤ x ≤ 0.2) was evaluated for use as interconnect materials in solid oxide fuel cells (SOFCs). Although SrTi1−xCoxO3 perovskites have a single perovskite phase in the range of 0 ≤ x ≤ 0.2, it was observed for SrTi0.8Co0.2O3 that Co element agglomerated at the grain boundary during sintering. The dense SrTi0.8Co0.2O3 sample was destroyed and included Sr2TiO4 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 SrTi0.9Co0.1O3 was comparable with those of SOFC cathodes and anodes. Co doping of SrTiO3 effectively increased electrical conductivity in air, whereas the conductivity of Co-doped SrTiO3 in a reducing atmosphere was much lower than that in air. This suggests that the Co ions3+/4+ in the perovskites were earlier reduced into Co2+ ions, compared to Ti4+ ions.
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October 2011
This article was originally published in
Journal of Fuel Cell Science and Technology
Research Papers
Evaluation of SrTi1−xCoxO3 Perovskites (0 ≤ x ≤ 0.2) as Interconnect Materials for Solid Oxide Fuel Cells
Zhenwei Wang,
Zhenwei Wang
Central Research Institute of Electric Power Industry
, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196 Japan
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Nobuyuki Serizawa,
Nobuyuki Serizawa
Central Research Institute of Electric Power Industry
, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196 Japan
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Takanori Itoh
Takanori Itoh
AGC Seimi Chemical Co., Ltd., 3-2-10 Chigasaki, Chigasaki-shi, Kanagawa-ken 253-8585
Japan
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Zhenwei Wang
Central Research Institute of Electric Power Industry
, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196 Japan
Nobuyuki Serizawa
Central Research Institute of Electric Power Industry
, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196 Japan
Takanori Itoh
AGC Seimi Chemical Co., Ltd., 3-2-10 Chigasaki, Chigasaki-shi, Kanagawa-ken 253-8585
Japan
J. Fuel Cell Sci. Technol. Oct 2011, 8(5): 051010 (6 pages)
Published Online: June 20, 2011
Article history
Received:
May 18, 2010
Revised:
November 23, 2010
Online:
June 20, 2011
Published:
June 20, 2011
Citation
Mori, M., Wang, Z., Serizawa, N., and Itoh, T. (June 20, 2011). "Evaluation of SrTi1−xCoxO3 Perovskites (0 ≤ x ≤ 0.2) as Interconnect Materials for Solid Oxide Fuel Cells." ASME. J. Fuel Cell Sci. Technol. October 2011; 8(5): 051010. https://doi.org/10.1115/1.4003761
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