Chemical diffusion in perovskite cathodes of solid oxide fuel cells:: the Sr doped LaMn1-xMxO3 (M=Co, Fe) systems

被引：40

作者：

Badwal, SPS

Jiang, SP

Love, J

Nowotny, J ^{[1
]}

Rekas, M

Vance, ER

机构：

[1] Univ New S Wales, Sch Mat Sci & Engn, Ctr Mat Res Energy Convers, Sydney, NSW 2052, Australia

[2] CSIRO, Clayton, Vic 3169, Australia

[3] Ceram Fuel Cell Ltd, Noble Pk, Vic 3174, Australia

[4] Australian Nucl Sci & Technol Org, Lucas Hts, NSW 2234, Australia

来源：

CERAMICS INTERNATIONAL | 2001年 / 27卷 / 04期

关键词：

diffusion; perovskite; SOFC; Sr doped LaMn1-xMxO3 (M=Co; Fe);

D O I：

10.1016/S0272-8842(00)00097-3

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：

This pager reports the results of chemical diffusion coefficient measurements for oxygen in (La,Sr)(Mn,Co)O-3 and (La,Sr)(Mn,Fe)O-3 using a manometric method in the temperature range of 773 to 1023 K. It was observed that the addition of Fe or Co into (La4xSrx)(1-y)MnO3 results in a substantial increase of the chemical diffusion coefficient. In the range 25-100 mol% of Co or Fe substitution at B-site in (La,Sr)MnO3, the chemical diffusion coefficient exhibits much lower activation energy than that in (La,Sr)MnO3. The chemical diffusion data in (La,Sr)(Mn,Co)O-3 and (La,Sr)(Mn,Fe)O-3 system determined by the manometric method are generally in agreement with those determined by electrochemical relaxation methods reported in the literature. A comparison of the chemical diffusion data indicates that the oxygen mobility is lowest in (La,Sr)MnO3 and highest in (La,Sr)CoO3. (C) 2001 Elsevier Science Ltd and Techna S.r.l. All rights reserved.

引用

页码：419 / 429

页数：11

共 21 条

[1] EFFECT OF SEGREGATION ON NEAR-SURFACE AND BULK TRANSPORT PHENOMENA IN IONIC-CRYSTALS [J].