4.8 Article

Interface engineering for modulating catalytic selectivity of covalent organic frameworks for oxygen reduction

Journal

MATERIALS TODAY CHEMISTRY
Volume 24, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.mtchem.2022.100936

Keywords

Covalent organic framework (COF); Selectivity control; Pyrazine nitrogen; Heterostructure; Electronic interaction

Funding

  1. National Natural Science Foundation of China (NSFC) [U1732267, 21972163, 22065107]
  2. Innovation Academy for Green Manufacture, Chinese Academy of Sciences [IAGM2020C16]
  3. National Natural Science Foundation of China [21972163]
  4. Fundamental Research Funds for the Central Universities
  5. DHU Distinguished Young Professor Program
  6. Development Fund for Shanghai Talents
  7. Foundation of State Key Laboratory of Coal Conversion [J21-22-903]
  8. Eastern Scholar Research Fund Shanghai Institutions of Higher Learning

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Covalent organic frameworks (COFs) have shown various applications in electrocatalytic systems due to their designability, controllable porosities and excellent stability. However, their poor conductivity limits their activity and selectivity. This study demonstrates the electronic synergism between catalytic COFs and carbon substrates through interface engineering, leading to significant improvements in performance.
Covalent organic frameworks (COFs) have shown various applications in electrocatalytic systems because of their designable skeletons, controllable porosities and excellent stability. Nevertheless, their poor conductivity resulted in limited activity and selectivity, and one of the most important strategies was mixing the COFs with conductive carbons. However, the electronic synergism between the active COFs and conductive substrate is still underexplored. Herein, we have first demonstrated the electronic synergism of catalytic COF and carbon substrate by constructing a hetero-interface toward ORR. The interface engineering of COFs achieved the turnover frequency (TOF) increases by two orders of magnitude and improved the half-wave potential to 0.79 V and limited current density to 5.5 mA cm-2. Additionally, the formation interface not only facilitates the electron transfer from substrate to the COF but also tunes the electronic properties of the COF. The electron modification of active sites changed the oxygen reduction from 2e to 4e pathway. This work provides us with a new insight in designing COFs for electrocatalysis.

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