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

Anke Hagen, Yi-Lin Liu, Rasmus Barfod, Peter Vang Hendriksen

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    Abstract

    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.
    Original languageEnglish
    JournalJournal of the Electrochemical Society
    Volume155
    Issue number10
    Pages (from-to)B1047-B1052
    ISSN0013-4651
    DOIs
    Publication statusPublished - 2008

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    Copyright The Electrochemical Society, Inc. [2008]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).

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