LAUSR

Abstract Molybdenum disulfide (MoS2) has been considered as the promising candidate towards high-efficient hydrogen evolution. It is highly desirable to engineer MoS2-based hybrid to enhance the catalytic performance, and the insight into catalytic essence is of great significance for further identification. Herein, we employ reduced graphene oxide (rGO) to construct MoS2@rGO hybrid catalyst, which exhibits an enhanced HER activity by ~160 mV in overpotential relative to the crumpled MoS2 (C-MoS2) when current density reaches 10 mA cm−2. It is confirmed that the satisfactory conductivity or electrochemical active surface area induced by rGO skeleton is far to fill the gap of catalytic enhancement. The X-ray absorption spectroscopy investigations validate the formation of Mo-O-C heterointerface, and then further comparative tests and density functional theory calculations reveal that the engineered Mo-O-C heterointerface within MoS2@rGO hybrid via charge transfer sustainably delivers the catalytic enhancement.