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Three-dimensional graphitized carbon nanovesicles for high-performance supercapacitors based on ionic liquids.

Chengxin Peng1, Zubiao Wen, Yao Qin

  • 1Department of Chemistry, Institute for Biomedical Engineering & Nano Science, Tongji University, Shanghai 200092 (P.R. China), Fax: (+86) 21-65983706.

Chemsuschem
|January 30, 2014
PubMed
Summary

Researchers developed a novel nanoporous carbon material from petroleum coke for high-performance supercapacitors. This graphitized carbon nanovesicle (GCNV) material offers superior energy density and rapid charging capabilities, comparable to batteries.

Keywords:
capacitorscarbonelectrochemistryionic liquidsnanostructures

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Advanced energy storage materials are crucial for next-generation devices.
  • Supercapacitors offer high power density but often lag in energy density compared to batteries.
  • Developing cost-effective, high-performance electrode materials remains a key challenge.

Purpose of the Study:

  • To synthesize a novel three-dimensional nanoporous carbon material.
  • To investigate its structural properties and electrochemical performance as a supercapacitor electrode.
  • To explore the synergistic effects with ionic liquid electrolytes for enhanced energy storage.

Main Methods:

  • Template-free KOH activation of petroleum coke precursor.
  • Characterization of the nanoporous carbon structure, including pore size and graphitization.
  • Electrochemical testing of the material as supercapacitor electrodes in ionic liquid electrolytes.

Main Results:

  • Successfully synthesized three-dimensional nanoporous carbon with interconnected vesicle-like pores (1.5-4.2 nm).
  • Achieved high specific surface area (2933 m²/g) and good conductivity due to highly graphitized, few-layer graphene walls.
  • Demonstrated superior supercapacitor performance with high energy densities (up to 145.9 Wh/kg) and rapid charging (97.6 Wh/kg in 47 s at 60°C).

Conclusions:

  • The developed graphitized carbon nanovesicle (GCNV) material exhibits excellent energy storage capabilities, rivaling batteries in energy output and exceeding them in power.
  • The unique nanostructure and high conductivity are key to the observed superior performance.
  • The synergistic interaction between GCNVs and ionic liquid electrolytes significantly enhances supercapacitor performance.