Development of LaNiO3-Ce0.9Gd0.1O1.95 Composite Cathode for Lowering the Operating Temperature of SOFCs

The electrochemical performance of LaNiO3-Ce0.9Gd0.1O1.95 (GDC) composite cathode was evaluated by electrochemical impedance spectroscopy with the symmetric cells fabricated. The performance was improved by mixing GDC into LaNiO3 due to increasing triple-phase boundary length per specific volume. In...

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Bibliographic Details
Published inECS transactions Vol. 91; no. 1; pp. 1461 - 1466
Main Authors Hirota, Tomohisa, Namioka, Tomoaki, Mori, Yuto, Miyata, Tomoya, Tanaka, Daiki, Itoh, Hibiki, Hashimoto, Shinichi
Format Journal Article
LanguageEnglish
Published The Electrochemical Society, Inc 10.07.2019
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Summary:The electrochemical performance of LaNiO3-Ce0.9Gd0.1O1.95 (GDC) composite cathode was evaluated by electrochemical impedance spectroscopy with the symmetric cells fabricated. The performance was improved by mixing GDC into LaNiO3 due to increasing triple-phase boundary length per specific volume. Intriguingly, interfacial conductivity of LaNiO3-€GDC composite cathode heat treated for 1 hour at 1173 K was higher than that of the (La0.6Sr0.4)0.99CoO3 cathode at around 773 K. heat treatment temperature was sensitive to both ohmic resistance and activation resistance. In the case of LaNiO3 -GDC composite cathode heat treated for 4 hours at 1273 K, a fluorite structure impurity is detected in the XRD pattern. We showed LaNiO3-GDC composite cathode is a potential candidate for cathode material for IT-SOFCs operating at around 773 K.
ISSN:1938-5862
1938-6737
DOI:10.1149/09101.1461ecst