The article discusses the development of energy-saving methods for high-performance electrodes in green hydrogen production. A green room-temperature synthesis method was reported to produce an integrated electrode with Cr-doped NiFe LDH/FeOOH nanosheets grown on iron foam. This one-step corrosion strategy can fabricate electrodes with an area of up to 600 cm2. The resulting Crv-NiFeOOH/FeOOH@IF electrode demonstrated excellent OER activity and durability, with ultralow overpotentials enabling high current densities. In situ tests and theoretical calculations highlighted the kinetics modulation achieved through Cr vacancies and the heterostructure of NiFeOOH/FeOOH, optimizing water oxidation processes. The study emphasizes the importance of developing scalable synthetic methods for high-performance electrodes in hydrogen production, addressing the need for earth-abundant alternatives with efficient OER performance.