The Electrochemical and Thermal Performances of Ca 3 Co 4 O 9-δ as a Cathode Material for IT-SOFCs

With the aim of application to cathode material in IT-SOFC, 2D misfit layered calcium cobalt oxide Ca3Co4O9-d was studied using XRD, SEM, thermal dilatometory and impedance spectroscopy. Chemical reactivity of Ca3Co4O9-d with electrolyte indicated good compatibility with CGO against generating impun...

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Published inECS transactions Vol. 25; no. 2; pp. 2625 - 2630
Main Authors Nagasawa, Kensaku, Mentre, Olivier, Daviero-Minaud, Sylvie, Preux, Nicolas, Rolle, Aurelie, Nakatsugawa, Hiroshi
Format Journal Article
LanguageEnglish
Published 25.09.2009
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Summary:With the aim of application to cathode material in IT-SOFC, 2D misfit layered calcium cobalt oxide Ca3Co4O9-d was studied using XRD, SEM, thermal dilatometory and impedance spectroscopy. Chemical reactivity of Ca3Co4O9-d with electrolyte indicated good compatibility with CGO against generating impunity phase CaZrO3 with YSZ. Thermal expansion coefficient of pure Ca3Co4O9-d exhibited 10.0-11.0×10-6 K-1, which is similar to that of CGO electrolyte. Indeed, we verified a good adherence between electrode thin layer and the electrolyte. Electrochemical property of Ca3Co4O9-d pellet showed good performances, i.e. ASR values are 3.0 and 24.5 Ωcm2 at 700 and 600 ºC in ambient air respectively, in our experimental conditions.
ISSN:1938-5862
1938-6737
DOI:10.1149/1.3205820