Heterogeneous Cu_1.92S@Cu₃P/Ni₂P Nanospheres on Nickel Foam for Effective Electrocatalytic Oxygen Evolution Reaction**

Abstract

The design and exploration of highly efficient and economical electrocatalysts for large-scale hydrogen generation from electrochemical water splitting is of great importance towards hydrogen economy. Herein, we have synthesized heterogeneous Cu 1.92 S@Cu 3 P/Ni 2 P nanospheres on nickel foam, which exhibits excellent OER activity in alkaline solution. When used as an anode, the overpotential of Cu 1.92 S@Cu 3 P/Ni 2 P at the current density of 10 mA cm À 2 is only 211 mV, with a good stability (24 h). The heterogeneous Cu 1.92 S@Cu 3 P/Ni 2 P nanospheres has synergistic modulation of electronic structure, abundant active sites and fast electron transfer rate, which contributes to its high OER activity.