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Abstract Efficient oxygen evolution reaction (OER) in alkaline seawater electrolysis is crucial for sustainable hydrogen production, but it is hindered by sluggish kinetics and chloride‐induced corrosion. Herein, an Al‐doped NiFe 2 O 4 catalyst is reported with a hydrangea‐like morphology supported on NiFe foam (12.3% Al‐NiFe 2 O 4 ), in which hole doping induced by the heterovalent Al 3+ ‐for‐Ni 2+ substitution reconstructs the Ni/Fe electronic environments, driving dual‐site synergistic regulation and energy barrier balancing. Specifically, the Fe d‐band center upshifts to strengthen *OH/*O adsorption, while the Ni d‐band center downshifts to balance the reaction pathway and facilitate *OOH desorption. This complementary synergy significantly accelerates OER kinetics. Besides, Al 3+ incorporation tailors the morphology to increase the exposure of catalytically active sites, thereby improving catalytic performance. Furthermore, the robust Al─O bonds generated in the catalyst inhibit chloride adsorption, enhancing corrosion resistance. Consequently, 12.3% Al‐NiFe 2 O 4 achieves current densities of 100 and 500 mA cm −2 at ultralow overpotentials of 232 and 257 mV, respectively, maintains stability for over 200 h at a current density of 100 mA cm −2 , and exhibits a high Faradaic efficiency of 94.8% in alkaline seawater. This study achieves synergistic functional differentiation of active sites through hole‐doping‐induced electronic reconstruction, offering a new design strategy for high‐performance seawater OER catalysts.
Xu et al. (Sun,) studied this question.