Abstract
Reactions at electrodes in contact with solid oxide electrolytes have been studied for application in steam electrolyzers and fuel cells to determine properties which could affect voltage losses. Polarization, ac impedance, and cyclic voltammetry measurements were used to study porous, non-porous, and single-contact electrodes. Simple oxides, complex oxides, and metals have been investigated on zirconia and thoria electrolytes in air, H 2O/H 2, and inert gases. The electrode performance was highly dependent on the electrode material and the presence of impurities, which played a major role in obtaining reproducible results and the formation of oxide layers. Models for the oxygen reaction have been developed and tested. The results were consistent with the formation of adsorbed oxygen on the electrode, catalyzed by the electrode surfaces.
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