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Redox Conductivity in Covalent Organic Frameworks.

Xin Hong1,2, Chenchen Qin1,2, Amol Kumar3

  • 1State Key Laboratory of Advanced Environmental Technology, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China.

Journal of the American Chemical Society
|April 2, 2026
PubMed
Summary
This summary is machine-generated.

Electron transport in electroactive covalent organic frameworks (COFs) occurs via redox-conductivity, involving electron hopping between redox-active units. This mechanism, demonstrated in naphthalene diimide-based COFs, is cation-dependent and shows stable insulator-to-semiconductor transitions.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Electroactive covalent organic frameworks (COFs) are promising for energy and environmental applications.
  • The electron transport mechanisms in these materials remain incompletely understood.
  • Understanding electron transport is crucial for optimizing COF performance.

Purpose of the Study:

  • To elucidate the electron transport mechanism in electroactive COFs.
  • To investigate the role of redox states and cation interactions in conductivity.
  • To demonstrate the potential for tunable electronic properties in COFs.

Main Methods:

  • Preparation of electroactive naphthalene diimide (NDI)-based COF thin films.
  • Operando UV-vis spectroelectrochemistry to monitor redox states.
  • Electrochemical modulation to study conductivity changes.
  • Cation-dependency studies on electron diffusion and redox conductivity.

Main Results:

  • Experimental evidence confirms electron transport via a redox-conductivity mechanism (electron hopping).
  • Conductivity exhibits a potential-dependent, bell-shaped distribution linked to redox composition.
  • Stable and reversible insulator-to-semiconductor transitions were observed over 100 cycles.
  • Electron transport and conductivity were found to be cation-dependent.

Conclusions:

  • Electron hopping is the primary mechanism for electron transport in these electroactive COFs.
  • The tunable electronic properties of COFs can be controlled electrochemically.
  • Cation-coupled electron transport is a key feature, influencing device performance.
  • The demonstrated hopping mechanism is general for NDI-based electroactive COFs.