A modified molten-salt method to prepare graphene electrode with high capacitance and low self-discharge rate

Jie Wang, Bing Ding, Xiaodong Hao, Yunling Xu, Ya Wang, Laifa Shen, Hui Dou, Xiaogang Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

Graphene is known to suffer from severe aggregation and incomplete recovery of a π-π conjugated system during the reduction process from graphene oxide. Here we report that these issues can be addressed by using a modified molten salt system. The advantages of the molten salt for reducing graphene show in three aspects: (i) prevent restacking; (ii) restore the conjugated network; (iii) serve as reaction medium for KNO3 activation and nitrogen doping. The molten-salt method-derived graphene (MNG) displays a highly sp2-hybrid constitution, nitrogen doping and hierarchically porous structure. With this design, the MNG-based supercapacitor manifests outstanding specific capacitance (234 F g-1 and 130 F g-1 in 6 M KOH and EMIMBF4 electrolyte, respectively), high power density, combined with excellent cycling stability and low self-discharge rate. The facile and scalable features of this strategy will be helpful for the rational design of functionalized graphene-based materials for diverse applications.

Original languageEnglish
Pages (from-to)255-261
Number of pages7
JournalCarbon
Volume102
DOIs
Publication statusPublished - 2016 Jun 1
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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