Developing oxygen evolution reaction (OER) electrodes with high catalytic activity and chloride corrosion resistance is crucial for advancing industrial seawater electrolysis for hydrogen production, yet it remains a significant challenge. In this work, we report a phytic acid (PA)‐modified Ni 3 Fe 1 N electrocatalyst for stable oxidation in both freshwater and seawater. The Ni 3 Fe 1 N–PA catalyst forms a unique multilayered structure, consisting of a conductive Ni 3 Fe 1 N core, an in situ Fe–NiOOH phase, and a phosphate‐rich PA layer. The Ni 3 Fe 1 N–PA electrode exhibits excellent OER performance, high selectivity, and chloride corrosion resistance in chloride‐containing electrolytes. In alkaline seawater, it achieves a current density of 500 mA cm −2 at an overpotential of 320 mV with stability exceeding 2200 h. Integrated into the Ni 3 Fe 1 N–PA || NiMoN cell, it requires only 1.784 V and 1.983 V to output 500 and 1000 mA cm −2 , respectively, maintaining stable operation for over 800 h. Moreover, it requires a cell voltage of only 1.997 V to achieve a current density of 1 A cm −2 in an alkaline anion exchange membrane electrolyzer and can operate stably for over 100 h. This work offers a promising approach for designing corrosion‐resistant anode catalysts for industrial‐scale seawater splitting.
Tian et al. (Wed,) studied this question.