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

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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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
Publication date2011
Volume196
Issue24
Pages10606-10610
ISSN0378-7753
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 2

Keywords

  • Solid Oxide Fuel Cells
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