Molybdenum in-situ etching treated ultra-thin NiFeMo LDHs nanosheet arrays as performance anodic catalyst for efficient industrial hydrogen production

Water splitting is a critical technology for renewable energy conversion and storage. The slow anodic process dynamics with high overpotential greatly limited the commercialization of electrolytic hydrogen production. Herein, we proposed an electrochemical in-situ etching method to achieve Molybdenum component controlled dissolved of ultra-thin NiFeMo layered double hydroxides(LDHs) nanosheet arrays on nickel-iron foam (NFF) to create in-situ reconstructed oxygen evolution reaction (OER) active sites in LDHs. The Mo-etched material exhibited significantly enhanced catalytic performance and demonstrated exceptional OER activity in alkaline media, achieving a low overpotential of 288 mV at 10 mA cm⁻² and 784 mV at 1000 mA cm⁻², along with a desired Tafel slope of 43.52 mV dec-1. The enhanced reaction kinetics is contributed by Mo doping-induced electronic structure optimization and interfacial stabilization. Furthermore, an assembled alkaline electrolyzer with NiFeMo/NFF maintained a stable electrolysis voltage (1.695±0.022 V) under simulated industrial fluctuating conditions (30 wt% KOH, 85℃, 3000 A m⁻²) for 210 hours, exhibiting a super low voltage decay rate(0.1 mV h-1). The superior performance-stability properties of new catalyst display new material design strategies for efficient industrial hydrogen production systems.