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Insight Into Fluorine-Nitrogen Synergistic Modification on Covalent Organic Frameworks for Efficient H2O2 Synthesis
Jun Zhang1, Fei Xue1, Zhonggang Wang1
1Department of Polymer Science and Materials, School of Chemical Engineering, Dalian University of Technology, Linggong Rd. 2, Dalian, 116024, China.
Fluorinated nitrogen-heterocycles in covalent organic frameworks (COFs) significantly boost hydrogen peroxide (H2O2) production. This study demonstrates a novel COF design for highly efficient photocatalytic H2O2 synthesis under visible light.
Area of Science:
- Materials Science
- Photocatalysis
- Green Chemistry
Background:
- Covalent Organic Frameworks (COFs) are promising materials for photocatalysis.
- Efficient synthesis of hydrogen peroxide (H2O2) is crucial for various industrial applications.
- Designing COFs with enhanced electronic and surface properties is key to improving photocatalytic efficiency.
Purpose of the Study:
- To develop novel fluorinated COFs for highly efficient photocatalytic H2O2 synthesis.
- To investigate the structure-property relationships of fluorine and nitrogen incorporation in COFs.
- To understand the synergistic mechanism for boosting photocatalytic performance.
Main Methods:
- Design and synthesis of trifluoropyridyl- and trifluorophenyl-functionalized triamino monomers.
- Polycondensation of monomers with triformylphloroglucinol to create fluorinated COFs (TFPyCOF and TFBCOF).
- Evaluation of photocatalytic H2O2 production rates under visible light using water and oxygen/air.
Main Results:
- TFPyCOF, with simultaneous fluorine and nitrogen in heterocycles, showed enhanced electron-hole separation and charge transfer compared to TFBCOF.
- TFPyCOF exhibited improved surface hydrophilicity.
- TFPyCOF achieved a significantly higher H2O2 production rate (8845 µmol g⁻¹ h⁻¹) than TFBCOF (4575 µmol g⁻¹ h⁻¹) under visible light, without sacrificial agents.
- Even with air as feedstock, TFPyCOF reached an HPR of 6381 µmol g⁻¹ h⁻¹, competitive with state-of-the-art photocatalysts.
Conclusions:
- Simultaneous incorporation of fluorine and nitrogen in heterocyclic COFs is an effective strategy for enhancing photocatalytic H2O2 production.
- The synergistic effect of fluorine and nitrogen modification improves charge dynamics and surface properties, leading to superior photocatalytic performance.
- This work provides valuable insights for designing advanced COF-based photocatalysts for sustainable chemical synthesis.
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