In situ Reduction and Oxidation of Nickel from Solid Oxide Fuel Cells in a Transmission Electron Microscope

Antonin Faes, Quentin Jeangros, Jakob Birkedal Wagner, Thomas Willum Hansen, Jan Van Herle, Annabelle Brisse, Rafal E. Dunin-Borkowski, Aïcha Hessler-Wyser

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    Environmental transmission electron microscopy was used to characterize in situ the reduction and oxidation of nickel from a Ni/YSZ solid oxide fuel cell anode support between 300-500{degree sign}C. The reduction is done under low hydrogen pressure. The reduction initiates at the NiO/YSZ interface, then moves to the center of the NiO grain. At higher temperature the reduction occurs also at the free NiO surface and the NiO/NiO grain boundaries. The growth of Ni is epitaxial on its oxide. Due to high volume decrease, nanopores are formed during reduction. During oxidation, oxide nanocrystallites are formed on the nickel surface. The crystallites fill up the nickel porosity and create an inhomogeneous structure with remaining voids. This change in structure causes the nickel oxide to expand during a RedOx cycle.
    Original languageEnglish
    JournalE C S Transactions
    Issue number2
    Pages (from-to)1985-1992
    Publication statusPublished - 2009
    Event216th ECS Meeting: 11th International Symposium B10 - Solid Oxide Fuel Cells - Vienna, Austria
    Duration: 4 Oct 20099 Oct 2009
    Conference number: 216


    Conference216th ECS Meeting

    Bibliographical note

    Copyright The Electrochemical Society, Inc. [2009]. 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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