Regulating the H 2 O 2 Photosynthetic Activity of Covalent Organic Frameworks through Linkage Orientation

Imine-linked isomeric covalent organic frameworks (COFs) with opposite linkage orientations are not rare, but their structure and photocatalytic property corrections are still puzzling, let alone the emerging photosynthetic H2O2 performance. Herein, a pair of isomeric COFs (TB-COF and TA-COF) with reversed imine linkages was fabricated. Compared to TA-COF, TB-COF exhibited larger dipole moments and better charge carrier separation efficiency, resulting in superior H2O2 photosynthesis capability via dominant oxygen reduction reaction (ORR) paths (O2–O2•––H2O2 and O2–O2•––O21–H2O2) and feeble water oxidation reaction (WOR) paths. With no sacrificial agents in the air, the H2O2 photosynthetic rates of TB-COF were…

• NN
  National Natural Science Foundation of China

  Awards: 21804081, 21675103, 22278249, 22134004
• NS
  Natural Science Foundation of Shandong Province

  Awards: ZR2022MB006, ZR2023MB063, ZR2021YQ13
• TS
  Taishan Scholar Project of Shandong Province

  Award: tsqn.202211102