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Yingwei Gao, Bo Ge, Hui Zhao, Chuanyu Jin, Seema Agarwal and Limin Zhao

Langmuir, 2026, https://doi.org/10.1021/acs.langmuir.5c06100

With high specific surface area, tunable framework structures, and outstanding chemical stability, covalent organic frameworks (COFs) can serve as photocatalysts to convert water into H₂O₂ under light irradiation. However, their low electronic transfer rates and narrow optical response range significantly constrain the application of COFs in photocatalysis research. Herein, a compound with an S-scheme heterojunction structure was synthesized by combining Dma-TAPT COFs with polyaniline (PANI) via a solvothermal method. Furthermore, protonated COFs were used to broaden the light absorption range and enhance charge transport. Owing to the synergistic effect, the photocatalytic H₂O₂ production of PANI-Dma-TAPT after protonation increased by 2.58 times (relative to Dma-TAPT). Under acidic conditions (pH 1), the H₂O₂ yield of H-PANI-Dma-TAPT reached 1171.7 μmol·g^–1, which was 3.7 times higher than that of Dma-TAPT. This study offers both practical insights and theoretical understanding into photocatalytic H₂O₂ production.