P-doped g-C3N4/MoS2 heterostructure for efficient electrocatalytic hydrogen evolution in acid

Hydrogen evolution reaction from electrolysis of water is expected to be an effective way for the sustainable development of hydrogen energy. Development of low-cost and high-efficiency catalysts is a key step in achieving large-scale applications. Molybdenum sulfide with a two-dimensional layered structure is considered an ideal material that can replace noble metal catalysts. Herein, a 3D porous P-20%-NV-g-C3N4/MoS2 composite catalyst was synthesized. P is doped into g-C3N4 containing N-vacancy, and then combined with MoS2 to form a heterostructure, which promotes the partial transformation of MoS2 from 2H to 1 T phase. The introduction of P changes the electronic structure of the composite, reduces the charge transfer resistance, and accelerates the reaction kinetics. In 0.5 M H2SO4, only an overpotential of 95 mV is required to generate a current density of 10 mA cm(-2) with a relatively small Tafel slope. This work provides a new way to regulate the electrocatalytic performance of MoS2.