Hybrid catalyst of MoS2-CoMo2S4 on graphene for robust electrochemical hydrogen evolution

Abstract

After years of development, boosting the electrochemical hydrogen evolution performance of MoS2 catalyst through the traditional methods, such as defect engineering and conductivity improvement, has reached their limit. In this work, we propose a novel functional catalyst that is fabricated by hybrid two-dimensional nanostructures composed of MoS2 nanosheets and CoMo2S4 nanoplates in situ grown on graphene substrate for electrochemical hydrogen evolution reaction. The MoS2-CoMo2S4/graphene hybrid catalyst shows robust hydrogen evolution performance with low onset potential of 110mV, high cathode current density of 85mAcm−2 at η=300mV, and small Tafel slope of 42mVdec−1, as well as good durability. The excellent hydrogen evolution performance of the hybrid catalyst is likely attributed to the nonequilibrium composition, 2D structural advantages, conductive graphene substrate, and the electrocatalytic synergistic effect between MoS2 and CoMo2S4.