Chemical Degradation of the La0.6Sr0.4Co0.2Fe0.8O3−δ/Ce0.8Sm0.2O2−δ Interface during Sintering and Cell Operation

Mélanie François; Maria Paola Carpanese; Olivier Heintz; Victoire Lescure; Davide Clematis; Lionel Combemale; Frédéric Demoisson; Gilles Caboche

LAPSE

Living Archive for Process Systems Engineering

LAPSE:2023.33108

Published Article

LAPSE:2023.33108

Chemical Degradation of the La0.6Sr0.4Co0.2Fe0.8O3−δ/Ce0.8Sm0.2O2−δ Interface during Sintering and Cell Operation

Mélanie François, Maria Paola Carpanese, Olivier Heintz, Victoire Lescure, Davide Clematis, Lionel Combemale, Frédéric Demoisson, Gilles Caboche

April 20, 2023

A complete cell consisting of NiO-Ce0.8Sm0.2O3−δ//Ce0.8Sm0.2O3−δ//(La0.6Sr0.4)0.95Co0.2Fe0.8O3−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 (La0.6Sr0.4)0.95Co0.2Fe0.8O3−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 (La0.6Sr0.4)0.95Co0.2Fe0.8O3−δ layer and at the interface with electrolyte. X-ray photoelectron spectroscopy (XPS) indicates that this Sr-rich phase corresponded to SrCO3. These different phenomena led to a chemical degradation of materials and interfaces, explaining the decrease in electrochemical performance.

Record ID

LAPSE:2023.33108

Keywords

cationic diffusion, impedance spectroscopy, interface, La0.6Sr0.4Co0.2Fe0.8O3−δ, Sm-doped ceria, X-ray photoelectron spectroscopy

Subject

Process Operations

Suggested Citation

François M, Carpanese MP, Heintz O, Lescure V, Clematis D, Combemale L, Demoisson F, Caboche G. Chemical Degradation of the La0.6Sr0.4Co0.2Fe0.8O3−δ/Ce0.8Sm0.2O2−δ Interface during Sintering and Cell Operation. (2023). LAPSE:2023.33108

Author Affiliations

François M: Laboratoire Interdisciplinaire Carnot de Bourgogne, FCLAB, ICB-UMR6303, CNRS—Université de Bourgogne Franche-Comté, 9 Avenue Savary, BP47870, CEDEX, 21078 DIJON, France
Carpanese MP: Department of Civil, Chemical and Environmental Engineering (DICCA)—Università Degli Studi di Genova, Via Montallegro 1, 16145 Genova, Italy; Institute of Condensed Matter Chemistry and Technologies for Energy (CNR-ICMATE), Via Operia Pia 15, 16145 Gen [ORCID]
Heintz O: Laboratoire Interdisciplinaire Carnot de Bourgogne, FCLAB, ICB-UMR6303, CNRS—Université de Bourgogne Franche-Comté, 9 Avenue Savary, BP47870, CEDEX, 21078 DIJON, France
Lescure V: Laboratoire Interdisciplinaire Carnot de Bourgogne, FCLAB, ICB-UMR6303, CNRS—Université de Bourgogne Franche-Comté, 9 Avenue Savary, BP47870, CEDEX, 21078 DIJON, France
Clematis D: Department of Civil, Chemical and Environmental Engineering (DICCA)—Università Degli Studi di Genova, Via Montallegro 1, 16145 Genova, Italy; Institute of Condensed Matter Chemistry and Technologies for Energy (CNR-ICMATE), Via Operia Pia 15, 16145 Gen [ORCID]
Combemale L: Laboratoire Interdisciplinaire Carnot de Bourgogne, FCLAB, ICB-UMR6303, CNRS—Université de Bourgogne Franche-Comté, 9 Avenue Savary, BP47870, CEDEX, 21078 DIJON, France [ORCID]
Demoisson F: Laboratoire Interdisciplinaire Carnot de Bourgogne, FCLAB, ICB-UMR6303, CNRS—Université de Bourgogne Franche-Comté, 9 Avenue Savary, BP47870, CEDEX, 21078 DIJON, France
Caboche G: Laboratoire Interdisciplinaire Carnot de Bourgogne, FCLAB, ICB-UMR6303, CNRS—Université de Bourgogne Franche-Comté, 9 Avenue Savary, BP47870, CEDEX, 21078 DIJON, France [ORCID]

Journal Name

Energies

Volume

14

Issue

12

First Page

3674

Year

2021

Publication Date

2021-06-20