Effects of B‐site doping and stoichiometry on strontium ferrate Sr0.85Ce0.15FexCoyO3 perovskites as electrocatalysts

• DOI: 10.1111/jace.20528
• Publication Date: 2025-03-31T15:40:39Z
• Authors: Maria Laura Tummino; Leonarda Francesc...; Massimiliano Lo Faro; Sabrina Campagna ...; Francesca Deganello
• Keywords: Stoichiometry; Alkaline earth metal

Abstract SrFeO 3 ‐based oxides are multi‐functional ceramics belonging to the ABO ‐type perovskite family, where iron is interestingly present at B‐site as Fe 4+ and partially reducible 3+ by doping strategies tailor physical–chemical properties. When doped, fine‐tuned exploitable in novel energy production systems, for example, electrocatalysts intermediate temperature solid oxide fuel cells (IT‐SOFCs). This work aimed evaluate how composition stoichiometry affect functional properties of materials when A‐site with cerium fixed 15 mol%. Hence, powdered samples were prepared solution combustion synthesis, modulating Fe/Co ratio or (Fe + Co). From an in‐depth characterization, it was found that both nonstoichiometry influenced structure, redox properties, electrochemical behavior. Still, played a major role improving oxygen adsorption capacity mobility, also thanks contribution segregated phases (CeO 2 , Sr O 7− δ ) generated induced unbalancing. The nonstoichiometric sample reached highest reduction capability IT‐SOFC operating (600°C) lowest activation (0.65 eV), whereas cobalt‐rich showed poorer performance electrode. These results encourage further research on tunable cobalt‐poor perovskites energy‐related devices.