Enhancing H2O2 Photocatalytic Production via Increased Triazine Moiety Content in the Skeleton of Covalent Triazine Framework.

Photocatalytic hydrogen peroxide (H₂O₂) synthesis offers a promising alternative through direct solar energy utilization. Covalent Triazine Frameworks (CTFs) have emerged as effective photocatalysts due to their structural integrity and nitrogen-rich composition. However, although it is generally considered that increasing the content of triazine moiety in the skeleton is beneficial for improving photocatalytic reaction efficiency, there is still a lack of more direct experimental evidence. In this study, we present the first design of a unique CTF and achieve precise control over the density of triazine units in the CTF skeleton through rational structural design. Further experiments demonstrate the direct impact of triazine content on H₂O₂ photosynthesis. Photocatalytic assessments reveal that for this unique structure, CTF-Th achieves 3.4 times higher than CTF-T with lower triazine content. This work introduces triazine ring concentration as a critical design parameter and establishes its relationship with photocatalytic performance, providing valuable insights for the rational design of advanced photocatalysts.