Microstructure‐Property Relations of Solid Oxide Fuel Cell Cathodes and Current Collectors Cathodic Polarization and Ohmic Resistance

摘要: Microstructure, cathodic polarization, and ohmic resistance on the cathode side of ZrO{sub 2}-based solid oxide fuel cells have been studied for intermediate temperature operation range between 700 900 C. Starting powder characteristics, calcination temperature, sintering strongly influence final microstructure cathodes. Electrochemical performance depends these processing parameters as well thickness contact spacing current collectors. A decrease in effective electrode area occurs both microscopic level with coarse inhomogeneous macroscopic a wide The smaller causes density distribution results consequently higher losses originating from electrolyte polarization. These are evaluated using La{sub 0.85}Sr{sub 0.15}MnO{sub 3} cathodes different microstructures 2}-8 mole percent Y{sub 2}O{sub electrolyte. path constrictions nonohmic is demonstrated Pt collectors geometric spacings.