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Surface Oxygen Exchange Kinetics in Oxide-Ion Conducting Solids

Published online by Cambridge University Press:  25 February 2011

Bernard A. Boukamp ,
H.J.M. Bouwmeester ,
H. Verweij  and
A.J. Burggraaf
Bernard A. Boukamp
Affiliation:
University of Twente, Faculty of Chemical Technology, laboratory for Inorganic Materials Science and Catalysis, P.O. Box 217, 7500 AE Enschede, The Netherlands
H.J.M. Bouwmeester
Affiliation:
University of Twente, Faculty of Chemical Technology, laboratory for Inorganic Materials Science and Catalysis, P.O. Box 217, 7500 AE Enschede, The Netherlands
H. Verweij
Affiliation:
University of Twente, Faculty of Chemical Technology, laboratory for Inorganic Materials Science and Catalysis, P.O. Box 217, 7500 AE Enschede, The Netherlands
A.J. Burggraaf
Affiliation:
University of Twente, Faculty of Chemical Technology, laboratory for Inorganic Materials Science and Catalysis, P.O. Box 217, 7500 AE Enschede, The Netherlands
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 293: Symposium U – Solid State Ionics III , 1992 , 361
Copyright
Copyright © Materials Research Society 1993

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