TpBD COF@ZnIn2S4 nanosheets: A novel S-scheme heterojunction with enhanced photoreactivity for hydrogen production

作者：Bao, Shutong; Tan, Qiuyan; Wang, Shaodan; Guo, Jie; Lv, Kangle^*; Carabineiro, Sonia A. C.; Wen, Lili^*

来源：Applied Catalysis B: Environmental , 2023, 330: 122624.

DOI：10.1016/j.apcatb.2023.122624

• COFs
• S-scheme heterojunction
• Photocatalytic H 2 production

Covalent-organic frameworks (COFs) are emerging photocatalysts with porous structures and excellent light-harvesting abilities. However, their photoreactivity still needs further improvement before they can be used in practical applications. Herein, we report, for the first time, on the construction of a heterojunction consisting of core-shell structured 1,3,5-triformylphloroglucinol (Tp) and 4,4 & PRIME;-biphenylenediamine (BD) COF at ZnIn2S4 (ZIS) nanosheets, using a microwave-hydrothermal method. The best performing sample, TpBD COF@ZIS-10 (with a ZIS:TpBD COF mass ratio of 10:1), in the absence of a co-catalyst, achieves a visible-light-driven H2 production rate of 2304 & mu;mol g_ 1 h_ 1 with an AQE of 5.02% at 420 nm, and exhibits excellent stability. The improved photocatalytic performance of TpBD COF@ZIS was attributed to the strong interaction at the interface and the S-scheme charge transfer mechanism, which not only stimulates efficient charge separation and migration, sup-pressing recombination, but also preserves the higher redox potentials of photo-generated electrons and holes.