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Construction of Graphene-Based "In-Paper" 3D Interdigital Microelectrodes for High Performance Metal-Free Flexible

Xuening Jiang1, Rixia Gao1, Gang Liu1

  • 1Key Laboratory of Materials Modification by Laser, Ion and Electron Beams Dalian University of Technology, Ministry of Education, School of Physics, Dalian, 116024, P. R. China.

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|March 7, 2022
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Summary

A new water-cooling laser ablation technique fabricates flexible 3D graphene-cellulose electrodes for high-performance micro-supercapacitors (MSCs). These paper-based devices offer excellent energy storage and mechanical flexibility for wearable electronics.

Keywords:
charge storageelectrodesgraphenemechanical flexibilityshape diversitiessupercapacitors

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Area of Science:

  • Materials Science
  • Energy Storage
  • Nanotechnology

Background:

  • Flexible micro-supercapacitors (MSCs) are crucial for portable electronics.
  • Achieving high performance and mechanical flexibility in MSC electrodes remains challenging.

Purpose of the Study:

  • To develop a novel technique for fabricating high-performance, flexible MSC electrodes.
  • To demonstrate the potential of these electrodes in paper-based MSCs for wearable applications.

Main Methods:

  • A water-cooling assisted selective laser ablation (WASLA) technique was used for mask-free, chemical-free fabrication.
  • 3D graphene-cellulose composite interdigital electrodes (3D GCCIEs) were embedded in paper.
  • Fabrication of metal-free 3D GCCIE-MSC integrated arrays with diverse shapes.

Main Results:

  • The WASLA technique successfully produced 3D GCCIEs with 3D charge storage geometry and high electrical conductivity.
  • 3D GCCIE-based MSCs demonstrated large specific capacitances, high rate performance, and excellent cyclic stability.
  • Fabricated MSC arrays showed remarkable mechanical flexibility, powering an LED in both flat and folded states.

Conclusions:

  • The WASLA method is effective for scalable manufacturing of high-performance paper-based energy storage devices.
  • The developed 3D GCCIE-MSCs show significant potential as power sources for flexible and wearable electronic devices.