Capacity improvement of the carbon-based electrochemical capacitor by zigzag-edge introduced graphene

Naoki Tamura, Takaaki Tomai, Nobuto Oka, Itaru Honma

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The electrochemical properties of graphene edge has been attracted much attention. Especially, zigzag edge has high electrochemical activity because neutral radical exits on edge. However, due to a lack of efficient production method for zigzag graphene, the electrochemical properties of zigzag edge have not been experimentally demonstrated and the capacitance enhancement of carbonaceous materials in energy storage devices by the control in their edge states is still challenge. In this study, we fabricated zigzag-edge-rich graphene by a one-step method combining graphene exfoliation in supercritical fluid and anisotropic etching by catalytic nanoparticles. This efficient production of zigzag-edge-rich graphene allows us to investigate the electrochemical activity of zigzag edge. By cyclic voltammetry, we revealed the zigzag edge-introduced graphene exhibited unique redox reaction in aqueous acid solution. Moreover, by the calculation on the density function theory (DFT), this unique redox potential for zigzag edge-introduced graphene can be attributed to the proton-insertion/-extraction reactions at the zigzag edge. This finding indicates that the graphene edge modification can contribute to the further increase in the capacitance of the carbon-based electrochemical capacitor.

Original languageEnglish
Pages (from-to)986-989
Number of pages4
JournalApplied Surface Science
Volume428
DOIs
Publication statusPublished - 2018 Jan 15

Keywords

  • Electrochemical capacitor
  • Energy storage devices
  • Zigzag-edge-rich graphene

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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