Enhanced electrochemical performance of the solid oxide fuel cell cathode using Ca3Co4O9+δ

Alfred Junio Samson, Martin Søgaard, Ngo Van Nong, Nini Pryds, Nikolaos Bonanos

    Research output: Contribution to journalJournal articleResearchpeer-review


    This paper reports on the electrochemical performance of an SOFC cathode for potential use in intermediate-temperature solid oxide fuel cells (IT-SOFCs) using the oxygen non-stoichiometric misfit-layered cobaltite Ca3Co4O9+δ or composites of Ca3Co4O9+δ with Ce0.9Gd0.1O1.95 (CGO/Ca3Co4O9+δ). Electrochemical impedance spectroscopy revealed that symmetric cells with an electrode of pure Ca3Co4O9+δ exhibit a cathode polarization resistance (Rp) of 12.4 Ω cm2, at 600 °C in air. Strikingly, Rp of the composite CGO/Ca3Co4O9+δ with 50 vol.% CGO was reduced by a factor of 19 (i.e. Rp = 0.64 Ω cm2), the lowest value reported so far for the Ca3Co4O9 family of compounds. These findings together with the reported thermal expansion coefficient, good compatibility with CGO and chemical durability of this material suggest that it is a promising candidate cathode for IT-SOFCs.
    Original languageEnglish
    JournalJournal of Power Sources
    Issue number24
    Pages (from-to)10606-10610
    Publication statusPublished - 2011


    • Solid Oxide Fuel Cells

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