Journal
JOURNAL OF POWER SOURCES
Volume 201, Issue -, Pages 26-36Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2011.10.088
Keywords
SOFC; Ceramic anodes; Strontium titanate; Redox; Spray pyrolysis; Nanoparticles
Funding
- Swiss SCIEX-NMSCH [PL0908005]
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In this study A-site deficient lanthanum doped strontium titanate, which is considered as a promising, redox-stable candidate for full ceramic anodes in Solid Oxide Fuel Cells (SOFCs), was produced by nanoparticle-based spray pyrolysis. In this process cost-effective nitrate salts and titania nanoparticles are used as precursors. LST with a nominal composition of La0.2Sr0.7TiO3 showed limited stability at temperatures higher than 1290 degrees C. It was observed that minor contents of secondary phases, which form at elevated temperatures, invoke a drastic loss of the electrical performance. Thermal stability is significantly increased by a slight enrichment of strontium. The phase pure A-site deficient LST shows remarkably higher electrical performance than similar stoichiometric counterparts. Reductive sintering results in a conductivity as high as 600 S cm(-1) at 600 degrees C. Furthermore the A-site deficient LST shows a high redox-stability and fast redox-kinetics. With these properties IST is a suitable material for the fabrication of a new generation of Ni-free ceramic SOFC anodes. Secondary phases have a significant influence on the electrical conductivity and redox behaviour. (C) 2011 Elsevier B.V. All rights reserved.
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