High‐Coverage Ce(OH)₃‐Decorated NiFe Layered Double Hydroxide for Durable Seawater Oxidation at Ampere‐Scale Current Densities

Abstract Seawater electrolysis powered by offshore renewable energy, provides an attractive approach for green hydrogen production. Yet, the abundant chloride ions (Cl⁻) in seawater pose severe challenges to the long‐term stability of anode materials, particularly under industrial current densities. Herein, a high‐coverage Ce(OH)₃‐decorated nickel‐iron layered double hydroxide (NiFe LDH) electrocatalyst is reported, in which Ce(OH)₃ undergoes in situ transformation into CeO₂ during alkaline seawater oxidation (ASO), forming a robust protective layer that effectively repels Cl⁻. The as‐prepared catalyst delivers an overpotential of only 321 mV at 1 A cm⁻ 2 and maintains exceptional operational stability for over 1000 h with negligible chlorine evolution. Furthermore, the catalyst exhibits accelerated bubble detachment behavior, facilitating rapid gas release and effectively reducing mass transfer resistance during ASO.