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Covalent Organic Frameworks with Tailored Functionalities for Modulating Surface Potentials in Triboelectric

Chao Lin1, Linhai Sun1, Xutong Meng1

  • 1Henan Key Laboratory of Functional Salt Materials, Center for Advanced Materials Research, Zhongyuan University of Technology, Zhengzhou, 45007, P. R. China.

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|September 6, 2022
PubMed
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Researchers improved the performance of triboelectric nanogenerators (TENGs) by designing novel covalent organic frameworks (COFs). Introducing specific functional groups enhanced surface potential and electron affinity, leading to higher output.

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Built-in FunctionalitiesCovalent Organic FrameworksSelf-Powered AnticorrosionSurface PotentialTriboelectric Nanogenerators

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Organic Chemistry

Background:

  • Improving the performance of triboelectric nanogenerators (TENGs) is crucial for advancing energy harvesting technologies.
  • Covalent organic frameworks (COFs) offer a tunable platform for designing advanced materials.

Purpose of the Study:

  • To investigate the impact of various functional groups on the triboelectric properties of COFs.
  • To establish a structure-property relationship for optimizing COF-based TENG materials.

Main Methods:

  • Synthesis of a series of COFs with similar skeletons but varied functional groups (electron-donating and electron-withdrawing).
  • Characterization using Kelvin probe force microscopy and computational methods to analyze surface potential and electron affinity.
  • Fabrication and testing of TENG devices utilizing the synthesized COFs.

Main Results:

  • Functional groups significantly influence the surface potential and electron affinity of COFs.
  • Electron-donating and electron-withdrawing groups enhance these properties, with fluorinated COFs showing the highest values.
  • A TENG device incorporating fluorinated COF achieved a high output voltage (420 V) and current (64 μA).

Conclusions:

  • The strategic incorporation of functional groups in COFs is an effective method for enhancing TENG performance.
  • This approach provides a pathway for the rational design and screening of high-performance TENG materials.