An EIS study of La2-aEuro parts per thousand x Sr (x) NiO4+ (delta) SOFC cathodes

Kent Kammer Hansen

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    Abstract

    La2 − x Sr x NiO4 +  δ materials were investigated as cathodes for the electrochemical reduction of oxygen on a Ce1.9Gd0.1O1.95 (CGO10) electrolyte using cone-shaped electrodes together with electrochemical impedance spectroscopy. The area-specific resistance (ASR) of the La2 − x Sr x NiO4 +  δ nickelates towards the reduction of oxygen is equal to the ASR of perovskites; however, it is not as low as for the best Fe–Co-based perovskites. The lowest ASR is found for the compound La1.75Sr0.25NiO4 +  δ with an ASR of 23.8 Ωcm2 measured on a cone-shaped electrode in air at 600 °C. It is suggested that difference in oxide ionic conductivity of the nickelates is the main cause for the different activity of the nickelates towards the electrochemical reduction of oxygen.
    Original languageEnglish
    JournalIonics
    Volume15
    Issue number3
    Pages (from-to)325-328
    ISSN0947-7047
    DOIs
    Publication statusPublished - 2009

    Keywords

    • Røggasrens
    • Fuel Cells and hydrogen
    • Flue gas purification

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