The mechanism behind redox instability of anodes in high-temperature SOFCs

Trine Klemensø, Charissa Chung, Peter Halvor Larsen, Mogens Bjerg Mogensen

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    Abstract

    Bulk expansion of the anode upon oxidation is considered to be responsible for the lack of redox stability in high-temperature solid oxide fuel cells (SOFCs). The bulk expansion of nickel-yttria stabilized zirconia (YSZ) anode materials was measured by dilatometry as a function of sample geometry, ceramic component, temperature, and temperature cycling. The strength of the ceramic network and the degree of Ni redistribution appeared to be key parameters of the redox behavior. A model of the redox mechanism in nickel-YSZ anodes was developed based on the dilatometry data and macro- and microstructural observations. (c) 2005 The Electrochemical Society.
    Original languageEnglish
    JournalJournal of The Electrochemical Society
    Volume152
    Issue number11
    Pages (from-to)A2186-A2192
    ISSN0013-4651
    DOIs
    Publication statusPublished - 2005

    Bibliographical note

    Copyright The Electrochemical Society, Inc. [2005]. 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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