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Surface Oxygen Exchange Kinetics in Oxide-Ion Conducting Solids

  • Bernard A. Boukamp (a1), H.J.M. Bouwmeester (a1), H. Verweij (a1) and A.J. Burggraaf (a1)

Abstract

The surface oxygen exchange on oxides with high oxygen ion mobility is modelled with a two step reaction with adsorbed mono-atomic oxygen species as intermediate. Interpretation of the Po2 dependence of the exchange rates, following from this model, indicates that these adsorbed oxygen atoms are singly charged.

For the stabilized δ-Bi2O3 solid electrolyte a good agreement has been found between the isotope exchange model and the electrochemical study of the oxygen exchange using gold electrodes. For the mixed La-Sr cobaltite perovskite a change in the surface exchange reaction is observed going from room temperature to 600°C. Indications are that above 450°C the bulk exchange is rate limiting with a (Po2)−1 dependence while below this temperature it is assumed that the dissociative adsorption is rate limiting with a (Po2)1/2 dependence.

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Surface Oxygen Exchange Kinetics in Oxide-Ion Conducting Solids

  • Bernard A. Boukamp (a1), H.J.M. Bouwmeester (a1), H. Verweij (a1) and A.J. Burggraaf (a1)

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