High-Performance Supercapacitors Based on Poly(ionic liquid)-Modified Graphene Electrodes

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• 作者：Tae Young Kim ; Hyun Wook Lee ; Meryl Stoller ; Daniel R. Dreyer ; Christopher W. Bielawski ; Rodney S. Ruoff ; Kwang S. Suh
• 刊名：ACS Nano
• 出版年：2011
• 出版时间：January 25, 2011
• 年：2011
• 卷：5
• 期：1
• 页码：436-442
• 全文大小：396K
• 年卷期：0
• ISSN：1936-086X

文摘

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.