Interface Engineering of MoS2–CoS2 Heteronanosheets for Enhanced Electrochemical Hydrogen Evolution Reaction

The heterostructured electrocatalysts with tunable electronic interaction and distinct synergetic effects have been confirmed as an efficient strategy for realizing high-performance hydrogen evolution reaction (HER). Herein, a simple synthetic strategy is reported for the growth of MoS2-CoS2 nanosheets on highly conductive reduced graphene oxide (MoS2-CoS2/RGO) to innovatively construct an electron-reconfiguration heterointerface. The strong electronic interactions between MoS2 and CoS2 interfaces lead to the redistribution of charge, which optimizes the adsorption-desorption of intermediates. Thus, the MoS2-CoS2/RGO exhibits superior catalytic activity toward HER with small overpotentials of 67 mV (1.0 M KOH) and 95 mV (0.5 M H2SO4), and remarkable stability. In addition, theoretical calculations reveal the redistribution of charge at the heterointerfaces, which decreases the energy barrier of adsorption for H intermediates and simultaneously enhances the kinetic of water dissociation. This work provides a simple strategy for designing heterostructured bimetallic electrocatalysts with a highly active interface.