Oxygen permeation of La0.3Sr0.7CoO3-delta

被引：170

作者：

Chen, CH ^{[1
]}

Bouwmeester, HJM ^{[1
]}

vanDoorn, RHE ^{[1
]}

Kruidhof, H ^{[1
]}

Burggraaf, AJ ^{[1
]}

机构：

[1] UNIV TWENTE,FAC CHEM TECHNOL,LAB INORGAN MAT SCI,NL-7500 AE ENSCHEDE,NETHERLANDS

来源：

SOLID STATE IONICS | 1997年 / 98卷 / 1-2期

关键词：

oxygen permeation; perovskite oxide; membrane;

D O I：

10.1016/S0167-2738(97)00097-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The oxygen permeability of dense La0.3Sr0.7CoO3-delta membranes has been measured in the range 750-1100 degrees C under 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 membrane. The measured activation energy is 60 kJ mol(-1). 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 transition from predominant control by diffusion to that by surface exchange. The ionic conductivity is about 0.5 S cm(-1) at 1000 degrees C. The characteristic thickness is extrapolated at a value of about 80 mu m.

引用

页码：7 / 13

页数：7

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