Tungsten-Doped Cobalt Sulfide/Selendie as High-Efficient Electrocatalyst for Outstanding Overall Water Splitting

Abstract

Abstract The development of earth-abundant and highly efficient bifunctional electrocatalysts is a pressing requirement for electrochemical water splitting. However, several critical challenges still need to be addressed. Element doping can effectively enhance the electrocatalytic activity by tuning the microstructure, morphology, and electronic structure. Therefore, this work rationally designs and prepares three-dimensional nanosphere-like structured W-doped CoS1.097/CoSe2 (W-CoS1.097/CoSe2) as efficient bifunctional electrocatalysts for overall water splitting. The W-CoS1.097/CoSe2 exhibits super activities with an overpotential of 69.76 mV at -10 mA cm− 2 for HER and 400.00 mV at 10 mA cm− 2 for OER, respectively. This study provides a new approach for the design of dual-functional catalysts for alkaline water electrolysis of transition metals.