Comparison of the Degradation of the Polarisation Resistance of Symmetrical LSM-YSZ cells, with Anode Supported Ni-YSZ/YSZ/LSM-YSZ SOFCs

Iris Maura Torres da Silva, Jimmi Nielsen, Johan Hjelm, Mogens Bjerg Mogensen

    Research output: Contribution to journalConference articleResearchpeer-review

    441 Downloads (Pure)

    Abstract

    Impedance spectra of a symmetrical cell with SOFC cathodes (LSM-YSZ/YSZ/LSM-YSZ) and an anode supported planar SOFC (Ni-YSZ/YSZ/LSM-YSZ) were collected at OCV at 650{degree sign}C in air (cathode) and humidified (4%) hydrogen (anode), over 155 hours. The impedance was affected by degradation over time in the same frequency range for both cells (~10 Hz), possibly indicating that the same physical process was affected in both types of cell. However, deconvolution of the impedance data was not straightforward. When n-values of the constant phase elements in the otherwise identical equivalent circuit for the full cell were changed slightly, very different results were obtained, showing the high sensitivity of the fitting procedure. Therefore, the equivalent circuit applied should be refined further, requiring comparison of impedance data of the cells at higher temperature (750, 850{degree sign}C).
    Original languageEnglish
    JournalE C S Transactions
    Volume25
    Issue number2
    Pages (from-to)489-498
    ISSN1938-5862
    DOIs
    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
    http://www.electrochem.org/meetings/biannual/216/216.htm

    Conference

    Conference216th ECS Meeting
    Number216
    CountryAustria
    CityVienna
    Period04/10/200909/10/2009
    Internet address

    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).

    Keywords

    • Solid Oxide Fuel Cells
    • Fuel Cells and hydrogen

    Cite this