Inhomogeneous current distributions at grain boundaries and electrodes and their impact on the impedance

被引：60

作者：

Fleig, J

Pham, P

Sztulzaft, P

Maier, J

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Simulog, F-38330 Montbonnot St Martin, France

来源：

SOLID STATE IONICS | 1998年 / 113卷

关键词：

current distribution; impedance; electrode; grain boundary; brick layer model; current constriction; solid oxide fuel cells;

D O I：

10.1016/S0167-2738(98)00400-7

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：

By using the finite element method two cases are treated for which inhomogeneous current distributions and their frequency dependence is of crucial importance: (i) the impedance of different microstructures is calculated and compared with the brick layer model; (ii) the interplay of current constriction at the three-phase boundary and the electrode polarization of porous gas electrodes as used in solid oxide fuel cells (SOFC) is investigated. The impact for a quantitative equivalent circuit analysis is discussed. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

引用

页码：739 / 747

页数：9

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