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Oxygen permeation of La0.3Sr0.7CoO3−δ

✍ Scribed by C.H. Chen; H.J.M. Bouwmeester; R.H.E. van Doorn; H. Kruidhof; A.J. Burggraaf

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
504 KB
Volume
98
Category
Article
ISSN
0167-2738

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✦ Synopsis

The oxygen permeability of dense La Sr CoO membranes has been measured in the range 750-11008C under 0.3 0.7 32d various oxygen partial pressure gradients. A sweep gas method was employed. Results indicate that in the range of thickness 0.057-0.215 cm used in the present study, the oxygen flux is predominantly controlled by bulk diffusion across the 21 membrane. The measured activation energy is 60 kJ mol . By fitting the permeation data for various thicknesses to the transport equation obtained upon assuming linear kinetics for the surface exchange reactions and bulk ionic transport, we could derive the oxygen ionic conductivity and the characteristic membrane thickness. The latter quantity determines the 21 transition from predominant control by diffusion to that by surface exchange. The ionic conductivity is about 0.5 S cm at 10008C. The characteristic thickness is extrapolated at a value of about 80 mm.

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