Se-doping-induced sulfur vacancy engineering of CuCo2S4 nanosheets for enhanced electrocatalytic overall water splitting

Se doping and sulfur vacancies improve the intrinsic catalytic activity of CuCo 2 S 3.68 Se 0.32 . The optimized CuCo 2 S 3.68 Se 0.32 exhibits excellent HER and OER performance in alkaline media and requires 1.52 V at 10 mA cm −2 for overall water splitting.