Journal
APPLIED SURFACE SCIENCE
Volume 295, Issue -, Pages 31-37Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2013.12.156
Keywords
Surface modification; Ionic liquids; Reduced graphene oxide; Electrochemical analysis; Capacitor
Categories
Funding
- Converging Research Center Program through the Ministry of Science, ICT and Future Planning, Korea [2013K000287]
- Basic Science Research Program of 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 work, reduced graphene oxide (rGO)/ionic liquids (IL) composites with different weight ratios of IL to rGO were synthesized by a simple method. In these composites, IL contributed to the exfoliation of rGO sheets and to the improvement of the electrochemical properties of the resulting composites by enhancing the ion diffusion and charge transport. The structure of the composites was examined by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The TEM images showed that IL was coated on the surface of rGO in a translucent manner. The electrochemical analysis of the prepared composites was carried out by performing cyclic voltammetry (CV), galvanostatic charge-discharge, and electrochemical impedance spectroscopy (EIS). Among the prepared composites, the one with a weight ratio of rGO to IL of 1: 7 showed the highest specific capacitance of 147.5 F g(-1) at a scan rate of 10 mV s(-1). In addition, the rate capability and cycle performance of the composites were enhanced compared to pristine rGO. These enhanced properties make the composites suitable as electrode materials for the better performance supercapacitors. (C) 2014 Elsevier B. V. All rights reserved.
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