Direct anodic exfoliation of graphite onto high-density aligned graphene for large capacity supercapacitors

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

34 Scopus Citations
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Author(s)

  • Liangsheng Hu
  • Yong Li
  • Lei Wang
  • Kaifu Huo
  • Lawrence Yoon Suk Lee
  • K. Y. Wong

Detail(s)

Original languageEnglish
Pages (from-to)515-523
Journal / PublicationNano Energy
Volume34
Online published12 Mar 2017
Publication statusPublished - Apr 2017

Abstract

Vertically oriented graphene nanosheets (VOGNs) fabricated on conductive substrates with a large amount of edge planes and open channels are ideal for electrochemical double-layer (EDL) capacitor electrodes. However, preparation of such a structure with high-density of graphene nanosheets is challenging. Herein, a facile, environment-friendly, and economical technique to prepare high-quality VOGNs directly on conductive graphite plates with a high mass loading is described. The VOGNs are obtained by electrochemical anodization of graphite and a large amount of aligned reduced graphene oxide (rGO) is produced and adheres strongly to the graphite substrate (G@rGO). The symmetrical supercapacitors composed of the G@rGO electrodes exhibit a high volumetric capacitance of 3.9 F cm−3 and energy density of 0.66 Wh L−1 (based on the volume of the whole electrode) at a current density of 7.5 mA cm−3 in 6 M KOH. The rate performance and long-term cycling stability are very good. The outstanding capacitive performance can be attributed to the unique structure of the G@rGO electrode which facilitates transportation of ions between the electrolyte and graphene surface, minimizes the distributive nature of charge storage, expedites the formation of EDL, and enhances the electrochemical utilization of graphene and stability by avoiding restacking and aggregation of graphene nanosheets.

Research Area(s)

  • Aligned graphene, Electrochemical exfoliation, Energy storage, Supercapacitor

Citation Format(s)

Direct anodic exfoliation of graphite onto high-density aligned graphene for large capacity supercapacitors. / Hu, Liangsheng; Peng, Xiang; Li, Yong; Wang, Lei; Huo, Kaifu; Lee, Lawrence Yoon Suk; Wong, K. Y.; Chu, Paul K.

In: Nano Energy, Vol. 34, 04.2017, p. 515-523.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal