Abstract
The ruthenium pyrochlores, , and ruthenium perovskites, were characterized as new electrode materials for solid oxide fuel cells. The electrical conductivity, cathodic polarization, thermal expansion, and reactivity with yttria‐stabilized zirconia were examined. The pyrochlores showed low cathodic overpotential even at 800°C, metallic behavior with high electrical conductivity, and no reaction with yttria‐stabilized zirconia at 900°C. The thermal expansion coefficient of the bismuth pyrochlore was comparable to yttria‐stabilized (8 mol % content) zirconia. The pyrochlores are very attractive for application as cathode materials in a solid oxide fuel cell with low operating temperature. © 2000 The Electrochemical Society. All rights reserved.
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