One-dimensional CO9S8-V3S4 heterojunctions as bifunctional electrocatalysts for highly efficient overall water splitting

Development of cost-effective, active and durable electrocatalysts for overall water splitting is still a huge challenge. Herein, we have constructed one-dimensional (1D) cobalt sulfide vanadium heterojunction nanowires arranged on carbon cloth (Co9S8-V3S4/CC) as bifunctional the efficient splitting. The 1D wire-structured Co9S8-V3S4 heterojunctions possess large surface area, plentiful sites rapid transport electrons/reactants release gas. Importantly, electron transfer from Co9S8 to V3S4 occurs at interface due strong electronic coupling effect in heterojunction, which electron-attracting (V2+) optimizes adsorption H* species hydrogen evolution reaction (HER), while electron-losing (Co3+) responds enhancement oxygen (OER) activity. Co9S8-V3S4/CC exhibits low overpotentials 85 232 mV 10 mA cm−2 small Tafel slopes 51 59 dec−1 HER OER, respectively. Especially, electrolyzer with V3S4/CC both anode cathode requires onset voltage 1.35 V cell 1.53 high Faradaic efficiencies robust stability. It can be driven by solar (1.53 V) continuous production oxygen. This study highlights design pursuit highly