Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 178, Issue 6, Pages 1844-1850Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2005.03.027
Keywords
La0.75Sr0.25Cr1-xMnxO3; electrical properties; chemical stability; solid oxide fuel cell; sulfur-tolerant anode
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Complex metal oxides with composition of La0.75Sr0.25Cr1-xMnxO3 (x = 0.4, 0.5, 0.6) (LSCM) have been synthesized and examined as anode materials for solid oxide fuel cells (SOFCs). LSCM compositions show excellent tolerance to both reduction and oxidation but the crystal structure transforms from hexagonal in air to orthorhombic in H-2. The volume change associated with this phase transformation is only about 1%, thus having little effect on other properties. The total electrical conductivity increases with the content of Mn, whereas the resistance to Sulfur poisoning increases with the content of Cr. Fuel cells using LSCM as the anode show very good performance when pure hydrogen is used as the fuel. However, they do not appear to be stable in fuels containing 10% of H2S. (c) 2005 Elsevier Inc. All rights reserved.
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