Interconnected MoS2/FeCo2S4 nanosheet array bifunctional electrocatalysts grown on carbon cloth for efficient overall water splitting

Abstract

Seeking and designing low-cost and efficient bifunctional electrocatalysts to replace the traditional Pt and IrO₂ catalysts is significant for the development of overall water splitting. Herein, the precursor of Mo intercalation into the CoFe-LDH interlayer is prepared by a simple hydrothermal method, and then the cross-linked MoS₂/FeCo₂S₄ nanosheet arrays are deposited on high conductivity carbon cloth by further hydrothermal vulcanization. The prepared MoS₂/FeCo₂S₄/CC catalyst served as a bifunctional electrocatalyst for overall water splitting presenting an excellent electrocatalytic performance with an overpotential of 161 mV for the HER at 10 mA cm⁻², and 307 mV for the OER at 50 mA cm⁻². The excellent electrochemical performance is attributed to the reasonable design and selection of composite catalysts and the unique morphology of the interconnected nanosheets.