A self-supported amorphous Ni–P alloy on a CuO nanowire array: an efficient 3D electrode catalyst for water splitting in alkaline media

An amorphous Ni–P alloy shell electrodeposited on a CuO nanowire array to synergistically boost the catalytic activity toward alkaline water splitting is reported, and this core@shell CuO@Ni–P nanowire array is durable with a cell voltage of only 1.71 V reaching a current density of 30 mA cm −2 using a two-electrode configuration in an alkaline water electrolyzer.