Anode Supported Solid Oxide Fuel Cells - Deconvolution of Degradation into Cathode and Anode Contributions

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 function of cell polarization either in air or oxygen on the cathode. Based on impedance analysis, contributions of 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); they were significantly smaller when testing in oxygen compared to air. Microstructural analysis of the cathode/electrolyte interface of a not-tested reference cell carried out after removal of the cathode showed sharp craters on the electrolyte surface where the LSM particles had been located. After testing in air, these craters flattened out and decreased in size, indicating the decrease of three phase boundary length. In contrast, they remained almost unchanged after testing in oxygen giving an explanation for the observed smaller - mainly anode related degradation rate.
    Original languageEnglish
    JournalE C S Transactions
    Volume7
    Issue number1
    Pages (from-to)301-309
    ISSN1938-5862
    DOIs
    Publication statusPublished - 2007
    Event10th International symposium on solid oxide fuel cells - Nara New Public Hall, Nara, Japan
    Duration: 3 Jun 20078 Jun 2007
    Conference number: 10

    Conference

    Conference10th International symposium on solid oxide fuel cells
    Number10
    LocationNara New Public Hall
    CountryJapan
    CityNara
    Period03/06/200708/06/2007

    Bibliographical note

    Copyright The Electrochemical Society, Inc. [2007]. 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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