“…As a widely studied metal-free photocatalyst in hydrogen evolution, graphite phase carbon nitride (g-C 3 N 4 ) has many outstanding merits, such as the appropriate band gap (2.78 eV), visible light responsibility, proper energy band position for hydrogen evolution, and rich coordination sites. In addition, the flexible two-dimensional (2D) structure and modifiable surface make g-C 3 N 4 an ideal platform for the construction of heterostructures. − However, the photocatalytic performance of g-C 3 N 4 is unsatisfactory, owing to the serious charge recombination and the lack of surface active sites. , Many efforts, such as doping, metal decoration, construction of heterostructure, and morphology and structure engineering, have been made to improve the photocatalytic performance of g-C 3 N 4 . Among them, combining 2D g-C 3 N 4 with 2D MoS 2 is an attractive strategy due to their similar 2D layered structures, which can provide a large specific area and guarantee sufficient contact between active sites and water.…”