High-performance supercapacitors based on poly(ionic liquid)-modified graphene electrodes

Tae Young Kim, Hyun Wook Lee, Meryl Stoller, Daniel R. Dreyer, Christopher W. Bielawski, Rodney S. Ruoff, Kwang S. Suh

Research output: Contribution to journalArticlepeer-review

620 Citations (Scopus)


We report a high-performance supercapacitor incorporating a poly(ionic liquid)-modified reduced graphene oxide (PIL:RG-O) electrode and an ionic liquid (IL) electrolyte (specifically, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide or EMIM-NTf2). PIL:RG-O provides enhanced compatibility with the IL electrolyte, thereby increasing the effective electrode surface area accessible to electrolyte ions. The supercapacitor assembled with PIL:RG-O electrode and EMIM-NTf2 electrolyte showed a stable electrochemical response up to 3.5 V operating voltage and was capable of yielding a maximum energy density of 6.5 W · h/kg with a power density of 2.4 kW/kg. These results demonstrate the potential of the PIL:RG-O material as an electrode in high-performance supercapacitors.

Original languageEnglish
Pages (from-to)436-442
Number of pages7
JournalACS nano
Issue number1
Publication statusPublished - 2011 Jan 25


  • Electrical double layers
  • Graphene
  • Ionic liquids
  • Supercapacitors
  • Thermal reduction
  • Ultracapacitors

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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