Covalent Organic Framework/g-C 3 N 4 van der Waals Heterojunction toward H 2 Production.

Photocatalytic water splitting into H is the most economic and environmentally friendly strategy for H production, and rationally constructing a heterojunction retains enormous influence on a photocatalytic system. Herein, 2D/2D covalent organic framework/graphitic carbon nitride (COF/CN) van der Waals heterojunctions were readily prepared via an ultrasonic method for high-efficiency visible-light photocatalytic H production. The photocatalytic H production performance of optimized COF/CN composites can reach up to 449.64 μmol·h, which is approximately 5 times that of pure CN (89.08 μmol·h). The characterization and experimental studies reveal that the synergistic effect between COF and CN contributes to promoting the interfacial migration and spatial separation of photoinduced e-h pairs, further boosting the photocatalytic hydrogen production activity. This work may open a new window to design and fabricate effective heterojunction photocatalysts for photocatalytic energy conversion.