Fe 3+ ‐Triggered Scalable Slow‐Corrosion Engineering for Industrial Anion Exchange Membrane Water Electrolysis at 2.0 A cm −2

ABSTRACT The practical application of anion exchange membrane water electrolysis (AEMWE) is hindered by the lack of durable anodes for industrial‐scale current densities (≥ 1000 mA cm −2 ). Herein, we report a scalable Fe 3+ ‐triggered homogeneous slow‐corrosion strategy to fabricate a Fe‐doped Ni(OH) 2 /NiS hybrid on nickel foam (Fe‐Ni(OH) 2 /NiS/NF) for the oxygen evolution reaction (OER). This approach couples the slow corrosion of Ni foam by Fe 3+ with the in situ nucleation of the Fe‐Ni(OH) 2 /NiS hybrid, creating a seamless, interface‐free integration with exceptional mechanical adhesion. The optimized Fe‐Ni(OH) 2 /NiS/NF electrode exhibits exceptional stability for over 1100 h at ampere‐level current densities up to 2000 mA cm −2 without performance decay. Mechanistic investigations reveal that the catalyst undergoes rapid reconstruction at low potentials to form an amorphous Ni(Fe)OOH layer, which serves as the true active phase and primarily follows the adsorbate evolution mechanism, thereby avoiding the chemical degradation associated with lattice oxygen participation. Density functional theory calculations indicate that Fe doping upshifts the NiOOH d‐band center, strengthening * OH adsorption and thus lowering the * OH→ * O barrier to accelerate OER kinetics. In an AEMWE, it requires only 1.706 and 1.852 V to achieve 1.0 and 2.0 A cm −2 , respectively, maintaining stable operation at industrial currents for over 1800 h.