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High-Performance Supercapacitors Based on Poly(ionic liquid)-Modified Graphene Electrodes
- Authors
- Kim, Tae Young; Lee, Hyun Wook; Stoller, Meryl; Dreyer, Daniel R.; Bielawski, Christopher W.; Ruoff, Rodney S.; Suh, Kwang S.
- Issue Date
- Jan-2011
- Publisher
- AMER CHEMICAL SOC
- Keywords
- supercapacitors; electrical double layers; graphene; ionic liquids; thermal reduction; ultracapacitors
- Citation
- ACS NANO, v.5, no.1, pp.436 - 442
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS NANO
- Volume
- 5
- Number
- 1
- Start Page
- 436
- End Page
- 442
- ISSN
- 1936-0851
- Abstract
- We report a high-performance supercapacitor incorporating a poly(ionic liquid) modified reduced; graphene oxide (PIL:RG-0) electrode and an ionic liquid (IL) electrolyte (specifically, 1-ethyl-3-methylimidazolium bis(trifluoromethylsuffonyl)amide or EMIM-NTf2). PIL:RG-0 provides enhanced compatibility with the IL thereby increasing the effective electrode surface area accessible to electrolyte ions. The supercapacitor assembled. with PIL:RG-0 electrode and EMIM-NTf2 electrolyte showed a stable electrochemical response up to 35 V operating voltage and was capable of yielding a maximum energy density of 65 W . h/kg with a power density of 24 kW/kg. These results demonstrate the potential of the PIL:RG-0 material as an electrode In high-performance supercapacitors.
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