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Nowadays,photocatalytic hydrogen (H2) production provides a hopeful approach to resolve the environment and energy crisis because it can use the earth-abundant solar energy and water and then produce H2 as clean and sustainable resources[1-2].In this paper,we for the first time report that semi-metallic 1T-MoReS3 acts as cocatalyst loading on the g-C3N4 nanotubes (NTs) through a solvothermal reaction process for photocatalytic hydrogen evolution.1T-MoReS3/g-C3N4 composites with 7 wt.% 1T-MoReS3 exhibit an expressively enhanced photocatalytic hydrogen evolution activity (2671 μmol·g-1·h-1),better than g-C3N4 NTs (61 μmol·g-1·h-1),1T-MoS2/g-C3N4 composites (2207 μmol h-1 g-1) and 1T-ReS2/g-C3N4 composites (1600 μmol h-1 g-1).According to the DFT calculation and experimental data,the enhanced photocatalytic activity of 1T-MoReS3/g-C3N4 composites is ascribed to the advantages as follows: 1) The porous g-C3N4 NTs with hollow structure possess short charge transfer distance and large surface area,promoting the light scattering and the transport of photoexcited carriers;2) 1T-MoReS3 as cocatalysts show a synergistic effect of 1T-MoS2 and 1T-ReS2 with better electrical conductivity,boosting the electron transfer process;3) After loading 1T-MoReS3 cocatalysts,1T-MoReS3/g-C3N4 composites show an improved light absorption and photoelectrochemical performance.