Abstract
The present work presents studies of potentiometric cells with electrolyte of 0.98Ce0.8(Sm0.75Sr0.2Ba0.05)0.2O1.875 + 0.02TiO2 and electrodes of silver or various materials with a perovskite structure. The oxygen activity limit is determined, above which electrolyte features preferred oxygen conductivity. Electrode materials are suggested that feature an equilibrium potential in the gas mixtures with the oxygen content from 1 to 21% and their lower temperature applicability limit is determined. The rate of potential response of the electrodes to a fast change in the oxygen partial pressure over the electrodes is determined. The results of studies are of interest for development of electrochemical devices with electrolyte based on ceria operating at 500–750°C.
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