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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
| Content Provider | MDPI |
|---|---|
| Author | François, Mélanie Carpanese, Maria Heintz, Olivier Lescure, Victoire Clematis, Davide Combemale, Lionel Demoisson, Frédéric Caboche, Gilles |
| Copyright Year | 2021 |
| Description | 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. |
| Starting Page | 3674 |
| e-ISSN | 19961073 |
| DOI | 10.3390/en14123674 |
| Journal | Energies |
| Issue Number | 12 |
| Volume Number | 14 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-06-20 |
| Access Restriction | Open |
| Subject Keyword | Energies Applied Chemistry Sm-doped Ceria La0.6sr0.4co0.2fe0.8o3−δ Cationic Diffusion Interface Impedance Spectroscopy X-ray Photoelectron Spectroscopy |
| Content Type | Text |
| Resource Type | Article |
