Solid Oxide Electrolysis Cells: Degradation at High Current Densities

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    Abstract

    The degradation of Ni/yttria-stabilized zirconia (YSZ)-based solid oxide electrolysis cells operated at high current densities was studied. The degradation was examined at 850°C, at current densities of −1.0, −1.5, and −2.0 A/cm2, with a 50:50 (H2O:H2) gas supplied to the Ni/YSZ hydrogen electrode and oxygen supplied to the lanthanum, strontium manganite (LSM)/YSZ oxygen electrode. Electrode polarization resistance degradation is not directly related to the applied current density but rather a consequence of adsorbed impurities in the Ni/YSZ hydrogen electrode. However, the ohmic resistance degradation increases with applied current density. The ohmic resistance degradation is attributed to oxygen formation in the YSZ electrolyte grain boundaries near the oxygen electrode/electrolyte interface. ©2010 The Electrochemical Society
    Original languageEnglish
    JournalJournal of The Electrochemical Society
    Volume157
    Issue number8
    Pages (from-to)B1209-B1217
    ISSN0013-4651
    DOIs
    Publication statusPublished - 2010

    Keywords

    • Fuel Cells and hydrogen
    • Electrolysis

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