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Perovskite oxides have emerged as promising electrocatalysts for the oxygen evolution reaction (OER) in water electrolysis, owing to their structural tunability and abundant redox-active sites. In particular, transition-metal-based perovskite oxides exhibit favorable intrinsic OER activity; however, their catalytic efficiency and operational stability still require further improvement to meet practical application demands. To address these challenges, we design a strategically modulated perovskite, Sm 0.1 SrCo 0.45 Fe 0.45 Ni 0.05 O 3-δ (SSCFN), featuring A-site enrichment and partial B-site substitution to enhance overall electrocatalytic performance and structural robustness. The co-introduction of excess Sm cations at the A-site and Ni cations at the B-site preserves lattice integrity and stabilizes a well-defined cubic phase, enabling synergistic modulation of key perovskite properties. Benefiting from increased oxygen vacancy concentration and improved electronic conductivity relative to the parent oxide SrCo 0.5 Fe 0.5 O 3-δ (SCF), SSCFN demonstrates outstanding OER performance, achieving a low overpotential of 319 mV at 10 mA cm −2 , a small Tafel slope of 73.5 mV dec −1 , and remarkable operational durability over 3000 min in alkaline media, specifically in 0.1 M KOH. These findings underscore the effectiveness of the synergistic A-site enrichment and multi-cation engineering strategy for developing high-performance perovskite OER catalysts with enhanced activity and durability.
Li et al. (Fri,) studied this question.