Engineering MoS2 Cocatalysts as Active Sites over Porous P-Doped g-C3N4 Nanosheets to Enhance Photocatalytic Hydrogen Production

Development of noble-metal-free cocatalysts is still a research hotspot to promote the photocatalytic H-2 evolution performance of graphite-phase carbon nitride (CN). Herein, 2D MoS2 nanosheets are used as a low-cost cocatalyst and loaded onto porous P-doped CN nanosheets (PCNNSs) to fabricate a 2D/2D noble-metal-free MoS2/PCNNSs photocatalyst via a simple in situ immersion pyrolysis method. The optimal H-2 evolution rate of the MoS2/PCNNSs sample reaches 1741 mu mol g(-1) h(-1), which is almost 2 times that of Pt/PCNNSs (976 mu mol g(-1) h(-1)). The outstanding activity mainly stems from the extended light absorption from 420 nm to the near-infrared 800 nm owing to MoS2 and P doping, as well as faster separation of photogenerated electrons and holes due to the close contact between PCNNSs and MoS2 induced by in situ fabrication method. This work unfolds new opportunities for the modification of cocatalysts to realize higher photocatalytic H-2 evolution activity.