IMPORTANCE OF THE SURFACE EXCHANGE KINETICS AS RATE-LIMITING STEP IN OXYGEN PERMEATION THROUGH MIXED-CONDUCTING OXIDES

Authors
BOUWMEESTER HJM KRUIDHOF H BURGGRAAF AJ
Citation
Hjm. Bouwmeester et al., IMPORTANCE OF THE SURFACE EXCHANGE KINETICS AS RATE-LIMITING STEP IN OXYGEN PERMEATION THROUGH MIXED-CONDUCTING OXIDES, Solid state ionics, 72, 1994, pp. 185-194
Citations number
39
Categorie Soggetti
Physics, Condensed Matter","Chemistry Physical
Journal title
Solid state ionics → ACNP
ISSN journal
01672738
Volume
72
Year of publication
1994
Part
2
Pages
185 - 194
Database
ISI
SICI code
0167-2738(1994)72:<185:IOTSEK>2.0.ZU;2-X
Abstract
Attention is drawn to the possible involvement of the surface exchange kinetics in limiting the rate of oxygen permeation through mixed-cond ucting oxide ceramics. A theoretical approach is provided with which i t is possible to distinguish between surface exchange- and bulk diffus ion controlled kinetics of oxygen permeation. New results on the oxyge n permeability of perovskites La0.8Sr0.2CoO3-delta and SrCo0.8Fe0.2O3- delta are presented. The importance of the exchange reaction relative to diffusion in limiting overall oxygen transport through (La,Sr) (Co, Fe)O-3-delta perovskite-type oxides is emphasized.