Current-Voltage Characteristics of Fuel Cells with Ceria-based Electrolytes
- 1 January 1995
- journal article
- Published by The Electrochemical Society in ECS Proceedings Volumes
- Vol. 1995-1 (1) , 1072-1081
- https://doi.org/10.1149/199501.1072pv
Abstract
Dense electrolyte membranes with a thickness of 200 μm have been prepared from ceria solid solutions with Gd2O3, Sm2O3 and CaO by tape casting. Electrochemical properties of CeO2-based fuel cells have been studied in the temperature range from 600 to 800 °C. The electrolytes exhibit an ionic conductivity of 3–5 S/m at 700 °C and mechanical stability in oxidizing as well as in reducing atmospheres. Power densities exceeding 350 mW/cm2 at 750°C are possible in CeO2-based fuel cells with perovskite cathodes and Ni-cermet anodes. The mixed ionic/electronic conductivity of ceria electrolytes and its influence on current-voltage characteristics under fuel cell operating conditions are discussed.Keywords
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