Thiophene-Doped Fully Conjugated Covalent Organic Frameworks for Efficient Photocatalytic Hydrogen Peroxide Generation

Open AccessCCS ChemistryRESEARCH ARTICLES22 Sep 2025Thiophene-Doped Fully Conjugated Covalent Organic Frameworks for Efficient Photocatalytic Hydrogen Peroxide Generation Hailong Lin, Guoying Tan, Yujun Ju, Pingru Su, Fengjuan Chen and Yu Tang Hailong Lin , Guoying Tan , Yujun Ju , Pingru Su , Fengjuan Chen and Yu Tang https://doi.org/10.31635/ccschem.025.202506161 SectionsSupplemental MaterialAboutPDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareFacebookTwitterLinked InEmail In the quest for enhancing the photocatalytic production of hydrogen peroxide (H2O2) using covalent organic frameworks (COFs), key processes such as light absorption, charge separation and transport, and surface redox reactions play a pivotal role. However, the simultaneous optimization of these processes is challenging owing to their intrinsic trade-offs and interdependencies. Drawing inspiration from the "bucket effect", we propose a mixed-linker strategy that combines two aldehyde monomers, namely terephthalaldehyde (TA) and 2,5-di(thiophen-2-yl)terephthalaldehyde (DTTA) with 2,4,6-trimethyl-1,3,5-triazine (TMT) in a precisely controlled ratio, resulting in the development of a high-performance TA/DTTA-2-TMT photocatalyst. The results revealed that the integration of DTTA units significantly broadened the light absorption range and enhanced the charge carrier separation. Concurrently, the inclusion of TA improved the crystallinity and hydrophilicity of the material, thereby facilitating efficient charge-carrier transport and mass transfer during the reaction. Consequently, the TA/DTTA-2-TMT photocatalyst achieved an exceptional H2O2 yield of 3451 μmol·g−1·h−1 in pure water, and under air atmosphere and 100 mW·cm−2 light intensity. This study not only presents a groundbreaking strategy for designing high-performance photocatalysts for H2O2 production but also underscores the transformative potential of mixed-linker COFs for the advancement of photocatalytic technologies. Download figure Download PowerPoint Previous articleNext article FiguresReferencesRelatedDetails Issue AssignmentNot Yet AssignedSupporting Information Copyright & Permissions© 2025 Chinese Chemical Society Downloaded 0 times PDF downloadLoading ...