Abstract
In-situ optical absorption measurements are used to derive the kinetics of oxidation and reduction of Pr0.1Ce0.9O2-d in an oxygen partial pressure range from 4 - 50% O2 at 600 oC without potential interference from catalytic metal electrodes. The chemical oxygen surface exchange coefficient is found to obey a power law dependence on pO2 suggesting an adsorption limiting process. The sources of discrepancies with values obtained in previous studies are discussed in terms of the catalytic activity of metal electrodes or changes in film surface chemistry.
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