Oxygen permeability and Faradaic efficiency of Ce0.8Gd0.2O2-δ-La0.7Sr0.3MnO3-δ composites

被引：72

作者：

Kharton, VV

Kovalevsky, AV

Viskup, AP

Figueiredo, FM

Yaremchenko, AA

Naumovich, EN

Marques, FMB ^{[1
]}

机构：

[1] Univ Aveiro, UIMC, Dept Ceram & Glass Engn, P-3810193 Aveiro, Portugal

[2] Inst Physicochem Problems BSU, Minsk 220080, BELARUS

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2001年 / 21卷 / 10-11期

关键词：

CeO2; ionic conductivity; membranes; oxygen permeation; perovskites;

D O I：

10.1016/S0955-2219(01)00167-4

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Composite Ce0.8Gd0.2O2-delta (CGO, solid electrolyte) and La0.7Sr0.3MnO3-delta (LSM, electronic conductor) ceramics were tested as dual-phase membranes for oxygen separation. Oxygen permeation through CGO-LSM composite ceramics containing similar percentages of both phases is limited by bulk ionic transport. In contrast to electronic transport, oxygen ion transport in these composites depends strongly on processing conditions, decreasing with interdiffusion of components. Oxygen ions are blocked by low ionic conductivity layers formed by diffusion of cations of LSM to the contacts between CGO grains. Testing of CGO-LSM membranes at high oxygen pressures (1-50 atm) showed that the composite ceramics are stable in these conditions and exhibit Wagner-type permeation fluxes. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：1763 / 1767

页数：5

共 9 条

[1]

Bouwmeester H.J.M., 1996, Membrane Science and Technology, V4, P435

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