Peculiar Properties of the La0.25Ba0.25Sr0.5Co0.8Fe0.2O3-δ Perovskite as Oxygen Reduction Electrocatalyst
Articolo
Data di Pubblicazione:
2023
Abstract:
The electrochemical reduction of molecular oxygen is a fundamental process in Solid Oxide Fuel Cells and requires high efficiency cathode materials. Two La0.25Ba0.25Sr0.5Co0.8Fe0.2O3-delta-based perovskite compounds were prepared by solution combustion synthesis, and characterized for their structural, microstructural, surface, redox and electrochemical properties as potential cathodes in comparison with Ba0.5Sr0.5Co0.8Fe0.2O3-delta and La0.5Sr0.5Co0.8Fe0.2O3-delta perovskites. Results highlighted that calcination at 900 degrees C led to a "bi-perovskite heterostructure", where two different perovskite structures coexist, whereas at higher calcination temperatures a single-phase perovskite was formed. The results showed the effectiveness of the preparation procedures in co-doping the A-site of perovskites with barium and lanthanum as a strategy to optimize the cathode's properties. The formation of nanometric heterostructure co-doped in the A-site evidenced an improvement in oxygen vacancies' availability and in the redox properties, which promoted both processes: oxygen adsorption and oxygen ions drift, through the cathode material, to the electrolyte. A reduction in the total resistance was observed in the case of heterostructured material.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
Ba-doped-LSCF; ORR; co-doping; heterostructure; oxygen vacancies
Elenco autori:
Aliotta, Chiara; Costa, Maria; Liotta, Leonarda Francesca; La Parola, Valeria; Magnacca, Giuliana; Deganello, Francesca
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