MoC quantum dots embedded in ultra-thin carbon film coupled with 3D porous g-C3N4 for enhanced visible-light-driven hydrogen evolution

The main purpose of photocatalytic hydrogen evolution is to fundamentally solve the problem of energy shortage and environmental pollution. In this experiment, based on the adjustment of the density of MoC quantum dots (MoC-QDs) on carbon film and the morphology of 3D porous g-C3N4, this exploring aimed at exploring the influence of various morphology combinations on the hydrogen evolution performance. Using bulk g-C3N4 (CN-B) as a reference, the tubular and honeycomb g-C3N4 were prepared by solvothermal and chemical vapor deposition methods. The experimental results show that the hydrogen production of MoCT-7 and MoCH-5 composite catalysts are 1.54 and 1.76 times that of MoCB-15, respectively, which proves that the ingenious morphology matching is an effective strategy to improve the catalytic performance. It is believed that CN-H and CN-T have unique slow photo effect and directional electron transfer characteristics, respectively. The well-dispersed MoC-QDs provide abundant active sites, and the thin carbon film is conducive to the adsorption of dye molecules and electrons transfer. This experiment is expected to provide some references for the in-depth study of g-C3N4 and the design of novel photocatalysts.