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.
Bouwmeester, H. J. M., Kruidhof, H., Burggraaf, A., & Burggraaf, A. J. (1994). Importance of the surface exchange kinetics as rate limiting step in oxygen permeation through mixed-conducting oxides. Solid state ionics, 72(72), 185-194. https://doi.org/10.1016/0167-2738(94)90145-7