Stability at La0.6Sr0.4CoO3-d cathode/La0.8Sr0.2Ga0.8Mg0.2O2.8 electrolyte interface under current flow for solid oxide fuel cells

被引：37

作者：

Horita, T

Yamaji, K

Sakai, N

Yokokawa, H

Weber, A

Ivers-Tiffée, E

机构：

[1] Natl Inst Mat & Chem Res, Tsukuba, Ibaraki 3058565, Japan

[2] Univ Karlsruhe, IWE, D-76131 Karlsruhe, Germany

来源：

SOLID STATE IONICS | 2000年 / 133卷 / 3-4期

关键词：

interface stability; La0.6Sr0.4CoO3-dLa0.8Sr0.2Ga0.8Mg0.2O2.8; SOFC; cathode reaction;

D O I：

10.1016/S0167-2738(00)00705-0

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 long-term stability was investigated at the porous La0.6Sr0.4CoO3-d cathode/La0.8Sr0.2Ga0.8Mg0.2O2.8 electrolyte interface by AC impedance under cathodic polarization at 800 degreesC. The interface resistance at La0.6Sr0.4CoO3-d/La0.8Sr0.2Ga0.8Mg0.2O2.8 increased with an operation duration time under a cathodic polarization of -0.033 V (applied voltage of -0.3 V). However, the ohmic resistance of La0.8Sr0.2Ga0.8Mg0.2O2.8 decreased with prolonged duration time. After long-term operation test (for about 700 h), no significant reaction layer could be found at the La0.6Sr0.4CoO3-d/La0.8Sr0.2Ga0.8Mg0.2O2.8 interface by SEM/EDX analysis. Small amounts of Co were observed in the electrolyte side, which can affect the ionic resistance of La0.8Sr0.2Ga0.8Mg0.2O2.8. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：143 / 152

页数：10

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