Solid oxide fuel cell performance under severe operating conditions

Søren Koch, P.V. Hendriksen, Mogens Bjerg Mogensen, Yi-Lin Liu, N. Dekker, B. Rietveld, B. de Haart, F. Tietz

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    The performance and degradation of Solid Oxide Fuel Cells (SOFC) were studied under severe operating conditions. The cells studied were manufactured in a small series by ECN, in the framework of the EU funded CORE-SOFC project. The cells were of the anode-supported type with a double layer LSM cathode. They were operated at 750 °C or 850 °C in hydrogen with 5% or 50% water at current densities ranging from 0.25 A cm–2 to 1 A cm–2 for periods of 300 hours or more. The area specific cell resistance, corrected for fuel utilisation, ranged between 0.20 Ω cm2 and 0.34 Ω cm2 at 850 °C and 520 mV, and between 0.51 Ω cm2 and 0.92 Ω cm2 at 750 °C and 520 mV.

    The degradation of cell performance was found to be low (ranging from 0 to 8%/1,000 hours) at regular operating conditions. Voltage degradation rates of 20 to 40%/1,000 hours were observed under severe operating conditions, depending on the test conditions.

    Data analysis revealed a critical cell voltage of ca 750 mV, above which the degradation rates were trivial, but below which they were significant.

    Some cells were also tested using a different procedure to that usually applied at Risø. This gave a different aging behaviour, indicating that the detailed test circumstances may be decisive to the outcome.

    Original languageEnglish
    JournalFuel Cells
    Volume6
    Issue number2
    Pages (from-to)130-136
    ISSN1615-6846
    DOIs
    Publication statusPublished - 2006
    Event6th European Solid Oxide Fuel Cell Forum - Lucerne, Switzerland
    Duration: 28 Jun 20042 Jul 2004
    Conference number: 6
    http://www.efcf.com/past/

    Conference

    Conference6th European Solid Oxide Fuel Cell Forum
    Number6
    CountrySwitzerland
    CityLucerne
    Period28/06/200402/07/2004
    Internet address

    Keywords

    • Accelerated test
    • Anode
    • Cathode activation
    • Degradation
    • Impedance spectroscopy
    • SOFC

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