Assessment of the cathode contribution to the degradation of anode-supported solid oxide fuel cells

被引：50

作者：

Hagen, A. ^{[1
]}

Liu, Y. L. ^{[1
]}

Barfod, R. ^{[2
]}

Hendriksen, P. V. ^{[1
]}

机构：

[1] Riso Natl Lab, Fuel Cells & Solid State Chem Dept, DK-4000 Roskilde, Denmark

[2] Topsoe Fuel Cell AS, DK-2800 Lyngby, Denmark

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2008年 / 155卷 / 10期

关键词：

D O I：

10.1149/1.2960938

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The degradation of anode-supported cells was studied over 1500 h as a function of cell polarization either in air or oxygen on the cathode side. Based on impedance analysis, contributions of the anode and cathode to the increase of total resistance were assigned. Accordingly, the degradation rates of the cathode were strongly dependent on the pO(2). Microstructural analysis of the cathode/electrolyte interface carried out after removal of the cathode showed craters on the electrolyte surface where the lanthanum strontium manganite (LSM) particles had been located. The changes of shape and size of these craters observed after testing correlated with the cell voltage degradation rates. The results can be interpreted in terms of element redistribution at the cathode/electrolyte interface and formation of foreign phases giving rise to a weakening of local contact points of the LSM cathode and yttria-stabilized zirconia electrolyte and consequently a reduced three-phase boundary length. (C) 2008 The Electrochemical Society.

引用

页码：B1047 / B1052

页数：6

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