Integrating hydrogen production with selective methanol oxidation to value-added formate over a NiS bifunctional electrocatalyst

Abstract The sluggish kinetics of oxygen evolution reaction (OER) severely limits the efficiency electrocatalytic water splitting to produce hydrogen. Therefore, an effective strategy is proposed replace OER with selective methanol oxidation (MOR). A nickel sulfide nanosheet catalyst supported on Ni foam (NiS/NF) was prepared by a facile hydrothermal method following sulfurization treatment. as-obtained could be used for co-electrolysis methanol/water hydrogen and value-added formate simultaneously. electrocatalyst can selectively oxidize (1.36 V vs.RHE) energy consumption significantly lower than OER. Furthermore, integrated two-electrode electrolyzer drives 10 mA cm ?2 at cell voltage 1.5 96% Faradaic MOR.