Interface engineering of a CeO₂–Cu₃P nanoarray for efficient alkaline hydrogen evolution

It is of great importance to design and develop highly active electrocatalysts for the hydrogen evolution reaction (HER) under alkaline conditions. In this work, we report the development of a CeO₂-Cu₃P nanoarray supported on nickel foam (CeO₂-Cu₃P/NF) as an excellent HER catalyst with the demand of an overpotential of only 148 mV to deliver a geometrical catalytic current density of 20 mA cm^-2 in 1.0 M KOH. Remarkably, this catalyst also shows strong long-term electrochemical durability for at least 100 h with nearly 100% Faradaic efficiency. Density functional theory calculations reveal that the CeO₂-Cu₃P/NF hybrid has a lower water dissociation energy and a more thermo-neutral hydrogen adsorption free energy.