电化学刻蚀法制备NiFeWP催化剂及其析氧性能OA

Electrolyzed water technology plays a key role in green hydrogen production,making the development of low-cost OER catalysts with high activity and stability of significant research and application value.The W-P co-doped Ni-Fe nano-composite catalytic layer was in-situ grown on the nickel-iron foam skeleton by electrochemical etching at±20 mA/cm2 for 20 cycles at room temperature,and the electrocatalyst NiFeWP/NFF with excellent performance was obtained.Results indicate that co-doping with W and P generates highly catalytic composite nanoparticles while modulating the catalyst's electronic structure.This induces a positive shift in Ni and Fe electron binding energies,favoring the formation of oxygen evolution active sites NiOOH and FeOOH.In1 mol/L KOH solution,the NiFeWP/NFF catalyst exhibits a low overpotential of 230 mV@10 mA/cm² and a low Tafel slope of 51.79 mV/dec.Analysis based on the Arrhenius equation indicates that the OER activation energy of NiFeWP/NFF is only 42.69 kJ/mol,representing a reduction of 29.72 kJ/mol compared to the NiFe/NFF catalyst.Importantly,the NiFeWP/NFF catalyst also exhibits excellent long-term stability under high-temperature,strong-alkaline conditions.A mild electrochemical etching method is provided to prepare non-precious metal oxygen evolution catalysts with high activity and stability.