CuO/La0.6Sr0.4Co0.2Fe0.8O3-δ Powder by XPS

Natile, Marta Maria; Galenda, Alessandro; Poletto, Fabio; Glisenti, Antonella

doi:10.1116/11.20070802

Cited by 1 publication

(1 citation statement)

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“…The La 3d spectra presented well separated spinorbit components and each spin-orbit component was split into doublets. The degree of splitting and the position of the doublet allow the determination of the element's chemical environment [63,64]. In the case of the reference LSCF, the doublet at 832.9 eV showed a split of 3.9 eV corresponding to LSCF [65,66].…”

Section: Structural and Surface Chemistry Analysismentioning

confidence: 99%

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

et al. 2021

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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.

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