Mott Schottky CoSx-MoOx@NF heterojunctions electrode for H2productionand urea-rich wastewater purification br

The sluggish kinetics of oxygen evolution reaction (OER) is the bottleneck of alkaline water electrolysis. The urea ox-idation reaction (UOR) with much faster kinetics was to replace OER. To further promote UOR, a heterojunction struc-ture assembled of CoSxand MoOxwas established, and then its superior catalytic activity was predicted by DFTcalculation. After that, an ultra-thin CoSx-MoOx@nickel foam (CoSx-MoOx@NF) electrode with a Mott-Schottky struc-ture was preparedviaa facile hydrothermal method, followed by a low-temperature vulcanization. Results highlightedCoSx-MoOx@NF electrode presented a superior performance toward UOR, OER, and H2evolution reaction (HER).Notably, it exhibited excellent electrocatalytic performance for OER (1.32 Vvs.RHE, 10 mA cm-2), UOR (1.305 Vvs.RHE, 10 mA cm-2), and urea-assisted overall water splitting with a low voltage (1.38 V, 10 mA cm-2) whenCoSx-MoOx@NF electrode served as both anode and cathode. It is promising to use CoSx-MoOx@NF in an electrochem-ical system integrated with H2generation and urea-rich wastewater purificatio