Importance of the surface exchange kinetics as rate limiting step in oxygen permeation through mixed-conducting oxides

H.J.M. Bouwmeester, H. Kruidhof, A.J. Burggraaf

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Abstract

Attention is drawn to the possible involvement of the surface exchange kinetics in limiting the rate of oxygen permeation through mixed-conducting oxide ceramics. A theoretical approach is provided with which it is possible to distinguish between surface exchange- and bulk diffusion controlled kinetics of oxygen permeation. New results on the oxygen permeability of perovskites La0.8Sr0.2CoO3−σ and SrCo0.8Fe0.2O3−σ are presented. The importance of the exchange reaction re to diffusion in limiting overall oxygen transport through (La,Sr)(Co,Fe)O3−σ perovskite-type oxides is emphasized.
Original languageEnglish
Pages (from-to)185-194
Number of pages10
JournalSolid state ionics
Volume72
Issue numberPart 2
DOIs
Publication statusPublished - 1994

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