Chemical Degradation of the La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ /Ce 0.8 Sm 0.2 O 2−δ Interface during Sintering and Cell Operation

Mélanie François, Maria Paola Carpanese, Olivier Heintz, Victoire Lescure, Davide Clematis, Lionel Combemale, Frédéric Demoisson and Gilles Caboche
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Mélanie François: Laboratoire Interdisciplinaire Carnot de Bourgogne, FCLAB, ICB-UMR6303, CNRS—Université de Bourgogne Franche-Comté, 9 Avenue Savary, BP47870, CEDEX, 21078 DIJON, France
Maria Paola Carpanese: Department of Civil, Chemical and Environmental Engineering (DICCA)—Università Degli Studi di Genova, Via Montallegro 1, 16145 Genova, Italy
Olivier Heintz: Laboratoire Interdisciplinaire Carnot de Bourgogne, FCLAB, ICB-UMR6303, CNRS—Université de Bourgogne Franche-Comté, 9 Avenue Savary, BP47870, CEDEX, 21078 DIJON, France
Victoire Lescure: Laboratoire Interdisciplinaire Carnot de Bourgogne, FCLAB, ICB-UMR6303, CNRS—Université de Bourgogne Franche-Comté, 9 Avenue Savary, BP47870, CEDEX, 21078 DIJON, France
Davide Clematis: Department of Civil, Chemical and Environmental Engineering (DICCA)—Università Degli Studi di Genova, Via Montallegro 1, 16145 Genova, Italy
Lionel Combemale: Laboratoire Interdisciplinaire Carnot de Bourgogne, FCLAB, ICB-UMR6303, CNRS—Université de Bourgogne Franche-Comté, 9 Avenue Savary, BP47870, CEDEX, 21078 DIJON, France
Frédéric Demoisson: Laboratoire Interdisciplinaire Carnot de Bourgogne, FCLAB, ICB-UMR6303, CNRS—Université de Bourgogne Franche-Comté, 9 Avenue Savary, BP47870, CEDEX, 21078 DIJON, France
Gilles Caboche: Laboratoire Interdisciplinaire Carnot de Bourgogne, FCLAB, ICB-UMR6303, CNRS—Université de Bourgogne Franche-Comté, 9 Avenue Savary, BP47870, CEDEX, 21078 DIJON, France

Energies, 2021, vol. 14, issue 12, 1-15

Abstract: A complete cell consisting of NiO-Ce 0.8 Sm 0.2 O 3−δ //Ce 0.8 Sm 0.2 O 3−δ //(La 0.6 Sr 0.4 ) 0.95 Co 0.2 Fe 0.8 O 3−δ elaborated by a co-tape casting and co-sintering process and tested in operating fuel cell conditions exhibited a strong degradation in performance over time. Study of the cathode–electrolyte interface after cell testing showed, on one hand, the diffusion of lanthanum from (La 0.6 Sr 0.4 ) 0.95 Co 0.2 Fe 0.8 O 3−δ into Sm-doped ceria leading to a La- and Sm-doped ceria phase. On the other hand, Ce and Sm diffused into the perovskite phase of the cathode. The grain boundaries appear to be the preferred pathways of the cation diffusion. Furthermore, a strontium enrichment was clearly observed both in the (La 0.6 Sr 0.4 ) 0.95 Co 0.2 Fe 0.8 O 3−δ layer and at the interface with electrolyte. X-ray photoelectron spectroscopy (XPS) indicates that this Sr-rich phase corresponded to SrCO 3 . These different phenomena led to a chemical degradation of materials and interfaces, explaining the decrease in electrochemical performance.

Keywords: Sm-doped ceria; La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ; cationic diffusion; interface; impedance spectroscopy; X-ray photoelectron spectroscopy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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