Nickel nano-network facilitates short-path hydrogen spillover for efficient alkaline hydrogen evolution with high-current-densities

Abstract

Oxide-supported catalysts are constrained by their inherently poor conductivity and isolated active sites, which hinder their ability to demonstrate effective hydrogen evolution reaction (HER) activity at high-current-densities. Here, we developed an alkaline HER catalyst comprising a nano-network assembled by Ni nanoparticles grown on MoO2 nanowires. Owing to the short-path hydrogen spillover and rapid electron transfer facilitated by the Ni nano-network, the catalyst achieves a current density of 1000 mA cm-2 at an extremely low overpotential of 165 mV, with a remarkable stability under high-current-densities.