Hierarchical Ni3S2-NiOOH hetero-nanocomposite grown on nickel foam as a noble-metal-free electrocatalyst for hydrogen evolution reaction in alkaline electrolyte

It is a challenge to explore inexpensive noble-metal-free catalysts with long-term stability at low overpotential for water electrolysis to produce hydrogen. Herein, we constructed hierarchical Ni 3 S 2 -NiOOH hetero-nanocomposite on nickel foam (NF@Ni 3 S 2 -NiOOH) through a two-step hydrothermal and electrodeposition method. The as-prepared NF@Ni 3 S 2 -NiOOH catalyst was capable of catalyzing hydrogen evolution reaction effectively with a low overpotential of 160 mV at a current density of 10 mA/cm 2 in 1.0 M NaOH, and maintained excellent performance for 45 h without obvious attenuation.