Construction of Efficient and Stable Ni(Fe)OOH Oxygen Evolution Reaction Electrodes via Topological Transformation and Electronic Regulation

Abstract

Water splitting represents a crucial path for large-scale green hydrogen production. However, sluggish kinetics of anodic oxygen evolution reaction (OER) remain a major challenge. Here, we developed a low-temperature liquid-phase strategy to synthesize sulfur-doped Ni-Fe compound precursors (NFF-NS), which underwent profound compositional and structural self-reconstruction by electrochemical activation (R-NFF-NS). The resulting R-NFF-NS catalyst exhibited superb OER activity and stability, requiring only an overpotential of 203.5 mV at 10 mA cm⁻² while stably working up to 1950 h even at 480 mA cm⁻².