Interface engineering of CoS/SnS2 nanosheets for boosting electrocatalytic overall water splitting in alkaline medium

Abstract

The rational design of active and cost-effective bifunctional catalysts for water electrolysis plays an important role in hydrogen production. Here, an interface engineering strategy is employed for preparing CoS/SnS2 heterojunctions on carbon cloth with rich sulfur vacancies. Such an electrocatalyst exhibits excellent performance for HER (η10: 151 mV) and OER (η10: 327 mV) under alkaline conditions. And only 1.71 V is required for a cell based on Cos/SnS2 as the bifunctional catalysts to achieve 10 mA cm−2 current density for full water splitting. DFT calculations indicate that the excellent electrochemical performance is attributed to the tunable electronic structure induced by sulfur vacancies and the heterojunctions.