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

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 kinet...

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Bibliographic Details
Published in:Solid state ionics 1994-09, Vol.72, p.185-194
Main Authors: Bouwmeester, H.J.M., Kruidhof, H., Burggraaf, A.J.
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Materials
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Summary: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.
ISSN:0167-2738
1872-7689
DOI:10.1016/0167-2738(94)90145-7