Construction of efficient and stable Ni(Fe)OOH oxygen evolution reaction electrodes via topological transformation and electronic regulation

Abstract

Water splitting represents a crucial pathway for large-scale green hydrogen production. However, the sluggish kinetics of the anodic oxygen evolution reaction (OER) remain a major challenge. Here, we develop 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. The resulting R-NFF-NS catalyst exhibited superb OER activity and stability, requiring an overpotential of only 203.5 mV at 10 mA cm⁻² while stably working up to 1950 h even at 480 mA cm⁻².