In Situ Growth of NiSe2-MoSe2 Heterostructures on Graphene Nanosheets as High-Performance Electrocatalyst for Hydrogen Evolution Reaction

Developing highly efficient and stable electrocatalysts for hydrogen evolution reaction (HER) is regarded as a crucial way to reduce energy loss in water splitting. Herein, NiSe2/MoSe2 heterostructures grown on graphene nanosheets (NiSe2-MoSe2 HTs/G) have been situ synthesized by simple hydrothermal reaction. As an electrocatalyst HER, NiSe2-MoSe2 HTs/G delivers superior performance with low Tafel slope of 65 mV dec−1, small overpotential 144 at 10 mA cm−2, long-term stability up 24 h. The HER can be mainly ascribed the synergistic effects heterostructures, which facilitate rapid electron transfer from electrode exposed MoSe2 edges take part reaction, thus boosting kinetics. Moreover, matrix high conductivity not only improve overall composite but also greatly increase active sites, therefore further promoting performance. This study provides route fabricating bimetallic selenides-based HER.