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The sluggish kinetics of the OER in alkaline media demand efficient non-precious electrocatalysts. This study develops a strategy of B-site Ru doping in Sr-substituted LaCoO3 perovskite to engineer its electronic structure, thereby activating the LOM. DFT calculations and electrochemical measurements were employed to investigate the electronic structure and catalytic performance. The synthesized La0.6Sr0.4Co0.9Ru0.1O3 (LSCR-0.1) catalyst achieves a low overpotential of 256.8 mV at 10 mA cm−2 and a Tafel slope of 84.88 mV dec−1, along with excellent long-term stability in alkaline electrolyte. The results show that Ru doping shifts the O 2p-band center and lowers the oxygen vacancy formation energy, significantly reducing the energy barrier of the rate-determining step. This work concludes that B-site doping on A-site substituted perovskites offers a general and effective strategy for modulating their electronic structure to enhance OER performance.
Zhang et al. (Wed,) studied this question.