Films of Certain Oxides of Rare-Earth Elements as the Activators of Platinum Electrode on ZrO2+10 mol % Y2O3 Electrolyte

摘要

The characteristics of porous Pt/YSZ (ZrO2 + 10 mol % Y2O3) electrodes activated with small amounts of either oxides of rare-earth elements (REE) of the cerium subgroup (CeO2, PrOx, TbOx) or a mixed oxide with the Ce2Tb4O11 composition by the procedure of impregnating the electrodes with ethanol solutions of REE nitrates and subsequent heating at 850 degrees C are studied by the impedance method. The studies are carried out for those cases where the REE oxides after thermal treatment form a film on the electrolyte and also where no activator film is formed. The characteristics of films and activated electrodes are compared. Film-activated Pt/YSZ electrodes are discussed within the framework of the model of compact oxide electrodes.