Journal
ELECTROCHIMICA ACTA
Volume 119, Issue -, Pages 11-15Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.11.187
Keywords
Graphene nanosheets; Ionic liquids; Electrochemical property; Supercapacitor
Categories
Funding
- Converging Research Center Program through the Ministry of Science, ICT and Future Planning, Korea [2013K000287]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning, Korea [NRF-2011-0009007]
- BK21 PLUS Centre for Advanced Chemical Technology (Korea) [21A20131800002]
- National Research Foundation of Korea [2011-0009007, 2010-50184] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, graphene nanosheets (GNS) were modified by 1-Butyl-3-methylimidazolium hexafluorophosphate, which is one of Ionic Liquid (IL). Owing to the modification of graphene with ionic liquids, graphene can not only be structurally stabilized, but also showed the higher charge transfer that is favor to exhibit an enhanced electrochemical performance. Also, a graphene aggregation by the intersheet van der Waals interaction can be prevented because ionic liquids act as an effective agent for the exfoliation of graphene sheets. The structural analysis of prepared composites was confirmed by transmission electron microscopy (TEM), Fourier transform infrared spectra (FT-IR) and X-ray diffractometer (XRD). The electrochemical properties are studied by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The GNS/IL composites show a high specific capacitance (114 Fg(-1)) compared to pristine graphene (99 Fg(-1)) at 10 mVs(-1) in 6 M KOH electrolyte. Also, the prepared composites showed the enhanced electrochemical performance such as high rate capability and excellent cycle performance. Therefore, the prepared composites could be a candidate of electrode materials for supercapacitors. (C) 2013 Elsevier Ltd. All rights reserved.
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