In situ observations of microstructural changes in SOFC anodes during redox cycling

Trine Klemensø, C. C. Appel, Mogens Bjerg Mogensen

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    Abstract

    The anode-supported solid oxide fuel cell (SOFC) degrades when the anode is subjected to redox cycling. The degradation has qualitatively been related to microstructural changes in the nickel-yttria stabilized zirconia anode of the tested cells. In this work, the microstructural changes were observed in situ using environmental scanning electron microscopy. In the reduced state, a dynamic rounding of the nickel particles occurred. The oxide growth upon re-oxidation depended on the oxidation kinetics. During rapid oxidation, the NiO particles divided into 2-4 particles, which grew into the surrounding voids. For slower oxidation, an external oxide layer was seen to develop around the individual particles. (c) 2006 The Electrochemical Society.
    Original languageEnglish
    JournalElectrochemical and Solid-State Letters
    Volume9
    Issue number9
    Pages (from-to)A403-A407
    ISSN1099-0062
    DOIs
    Publication statusPublished - 2006

    Bibliographical note

    Copyright The Electrochemical Society, Inc. [2006]. 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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