Efficient hydrogen production on MoNi electrocatalysts with fast water dissociation kinetics.

Various platinum-free electrocatalysts have been explored for hydrogen evolution reaction in acidic solutions. However, in economical water-alkali electrolysers, sluggish water dissociation kinetics (Volmer step) on platinum-free electrocatalysts results in poor hydrogen-production activities. Here we report a MoNi electrocatalyst supported by MoO cuboids on nickel foam (MoNi/MoO@Ni), which is constructed by controlling the outward diffusion of nickel atoms on annealing precursor NiMoO cuboids on nickel foam. Experimental and theoretical results confirm that a rapid Tafel-step-decided hydrogen evolution proceeds on MoNi electrocatalyst. As a result, the MoNi electrocatalyst exhibits zero onset overpotential, an overpotential of 15 mV at 10 mA cm and a low Tafel slope of 30 mV per decade in 1 M potassium hydroxide electrolyte, which are comparable to the results for platinum and superior to those for state-of-the-art platinum-free electrocatalysts. Benefiting from its scalable preparation and stability, the MoNi electrocatalyst is promising for practical water-alkali electrolysers.