The Ni-Fe composite catalyst has received in-depth research attention due to high intrinsic activity in electrochemical water splitting applications. Corrosion engineering is considered an effective strategy for preparing large-scale Ni-Fe composites to match industrial electrocatalytic electrolyzers. Here, we demonstrate an efficient corrosion strategy to prepare defect-rich Ni(Fe)OOH/Ni(Fe)S-x nanosheet arrays on a NiFe foam within 10 min. The corrosion solution we proposed (containing (NH4)(2)S2O8, (NH2)(2)CS, and FeCl3) has strong oxidizing properties, which releases a large amount of heat...
