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Realizing Highly-Ordered Laser-Reduced Graphene for High-Performance Flexible Microsupercapacitor.

Yirong Zhao1,2, Jingwei Du3, Jiajun Du4

  • 1School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, China.

Small (Weinheim an Der Bergstrasse, Germany)
|May 15, 2023
PubMed
Summary

A novel pre-reduction strategy prevents deflagration during laser reduction of graphene oxide (GO), enabling uniform, flexible reduced graphene oxide (rGO) films for advanced micro-supercapacitors.

Keywords:
graphenelaser reductionmicro-supercapacitorsself-assemble

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Area of Science:

  • Materials Science
  • Energy Storage
  • Nanotechnology

Background:

  • Laser reduction of graphene oxide (GO) offers a mask-free, chemical-free method for creating flexible energy storage devices.
  • Deflagration during laser reduction leads to brittle reduced graphene oxide (rGO) with irregular structures, hindering device performance.

Purpose of the Study:

  • To develop a pre-reduction strategy to mitigate deflagration during laser reduction of GO.
  • To achieve uniform laser-reduced GO (LrGO) matrices for high-performance flexible micro-supercapacitors (MSCs).

Main Methods:

  • GO was pre-reduced using ascorbic acid to decrease oxygen-containing functional groups.
  • A self-assembled skeleton of pre-reduced GO (PGO) nanosheets was constructed.
  • Laser reduction was applied to the PGO framework to create controllable rGO films.

Main Results:

  • The pre-reduction strategy successfully avoided deflagration, resulting in uniform LrGO.
  • MSCs assembled with laser-reduced PGO achieved a maximum areal capacitance of 88.32 mF cm⁻².
  • The flexible MSCs demonstrated excellent cycling stability (82% retention after 2000 cycles) and durability (no degradation after 5000 bending cycles).

Conclusions:

  • Pre-reduction is an effective strategy to enhance the quality of laser-reduced GO for energy storage applications.
  • This method enables the fabrication of high-performance, flexible micro-supercapacitors.
  • The findings open avenues for developing advanced micro-power devices using improved LrGO materials.