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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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Efficient aqueous processing and utilization of high-quality graphene for high performance supercapacitor electrode.

Yunping Wu1, Tianyi Ding1, Rui Zhai1

  • 1Department of Chemistry, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Materials, Xi'an Key Laboratory of Sustainable Energy Material Chemistry, School of Science, Xi'an Jiaotong University, Xi'an 710049, PR China.

Journal of Colloid and Interface Science
|November 25, 2019
PubMed
Summary

Researchers developed a green method to create advanced graphene materials using cellulose. This technique enables stable aqueous graphene colloids and novel graphene-based devices like supercapacitors.

Keywords:
Aqueous dispersionCelluloseHigh quality grapheneMolecular graftingSupercapacitor

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • High quality graphene (HQG) possesses unique properties valuable for many applications.
  • Challenges exist in the green, controllable synthesis of advanced graphene materials, particularly in aqueous solutions.
  • Facile solution processing and functionalization of graphene are critical for new material development.

Purpose of the Study:

  • To tailor the surface chemistry of HQG for improved solution processability and functionalization.
  • To develop a green, aqueous-phase synthesis method for novel graphene-based materials.
  • To explore the application of engineered graphene heterostructures in energy storage devices.

Main Methods:

  • Surface engineering of HQG using cellulose macromolecules (CM) with grafted carboxyl groups.
  • Hydrophobic-driven assembly of CM onto HQG to create stable aqueous graphene colloids.
  • In situ synthesis of cobalt oxide (Co3O4) nanoparticles on functionalized graphene sheets (HQG-COOH-Co3O4).

Main Results:

  • Stable aqueous graphene colloids were achieved via electrostatic repulsion from carboxyl-grafted CM.
  • Evenly distributed Co3O4 nanoparticles were successfully formed on HQG sheets.
  • The resulting 2D HQG-COOH-Co3O4 heterostructures demonstrated potential as supercapacitor electrodes.

Conclusions:

  • Surface modification of HQG with carboxyl-grafted CM provides a viable route for stable aqueous processing.
  • The developed method enables green, low-cost synthesis of advanced graphene-based materials.
  • HQG-COOH-Co3O4 heterostructures show promise for high-performance supercapacitor applications.