Boosting hydrogen peroxide photosynthesis via a 1D/2D S-scheme heterojunction constructed by a covalent triazine framework with dual O2 reduction centers

Emerging as lamellar materials, covalent triazine frameworks (CTFs) exhibited great potential for photocatalysis, but their photocatalytic performance is always hindered by the prone recombination of photogenerated carriers. To overcome this obstacle, a 1D/2D step-scheme (S-scheme) heterojunction is constructed for photocatalytic synthesis of H₂O₂. The S-scheme heterojunction fabricated with CTF and ZnO effectively enhances light absorption, redox capabilities, and charge carrier separation and transfer. In particular, the CTF is decorated with benzothiadiazole and triazine groups as dual O₂ reduction active centers, boosting photocatalytic H₂O₂ production. The optimal ZC-10 hybrid delivers a maximum H₂O₂ generation rate of 12000 μmol g^–1 h^–1, 10.3 and 164 times higher than those of zinc oxide nanorods and CTFs, respectively. Moreover, the charge transfer mechanism in the S-scheme heterojunction is well investigated with in situ spectroscopic measurements and theoretical calculations.