Sulfide-oxidation-assisted electrochemical water splitting for H2 production on a bifunctional Cu2S/nickel foam catalyst

A two-electrode SOR-assisted HER system was established using a highly efficient and stable bifunctional Cu 2 S/NF electrode. A current density of 100 mA cm −2 was obtained at a cell voltage of 0.64 V, and 74% energy was saved versus direct HER.