2D-2D SnS2/Covalent Organic Framework Heterojunction Photocatalysts for Highly Enhanced Solar-Driven Hydrogen Evolution without Cocatalysts

Covalent organic frameworks (COFs) are a category of promising materials in the field of solar-driven hydrogen (H-2) evolution, but their applications are limited by the speedy recombination of photoinduced charge carriers and the absorption of marginal visible light. Herein, a 2D-2D SnS2/TpPa-1-COF heterojunction photocatalyst was prepared via a one-step hydrothermal route to relieve the abovementioned shortcomings. The results show that the obtained 2D-2D SnS2/TpPa-1-COF heterojunctions not only speed up the separation of photogenerated charge carriers but also facilitate the H-2 production kinetics and expand the range of visible light response to orange light (600 nm). Especially, the maximum photocatalytic H-2 production rate of the 2D-2D SnS2/TpPa-1-COF heterojunction without the addition of cocatalyst Pt reaches 37.11 mu mol h(-1), which is 21.7-fold and 2-fold higher than those of individual TpPa-1-COF and 3 wt % Pt/TpPa-1-COF, respectively. This work indicates that the synthesis of cheap COF-based photocatalysts for high-efficiency solar energy utilization is a feasible approach to boost the photocatalytic H-2 performance.

Automated summary

The preparation of 2D-2D SnS2/TpPa-1-COF heterojunction photocatalyst can accelerate the separation of photogenerated charge carriers, broaden the response range to visible light, and enhance the efficiency of photocatalytic H-2 production.