Abstract
In this paper, cationic surfactant cetyltrimethylammonium bromide (CTAB) was employed to prevent the restack of the thermally reduce graphene oxide (TRG) sheets. A facile approach was demonstrated to effectively enlarge the interlayer distance of the TRG sheets through the ionic interaction between the intercalated CTAB and ionic liquids (ILs). The morphology of the composites and the interaction between the intercalated ionic species were systematically characterized by SEM, SAXS, XRD, TGA, and FTIR. In addition, the performance of the EDLC cells based on these TRG composites was evaluated. It was found that due to the increased interlayer distance (0.41 nm to 2.51 nm) that enlarges the accessible surface area for the IL electrolyte, the energy density of the cell can be significantly improved (23.1 Wh/kg to 62.5 Wh/kg).
Highlights
Owing to global warming and the depletion of fossil fuels, the demand on alternative energy storage and conversion devices is growing higher than ever
We investigate the influence of the interlayer distance on the performance of the thermally reduce graphene oxide (TRG) based electrical double layer capacitors (EDLCs) cells
cetyltrimethylammonium bromide (CTAB) was due to theIt ionic interaction the TRGCE, additionalthe the intercalated andshifted the EMI-TFSI
Summary
Owing to global warming and the depletion of fossil fuels, the demand on alternative energy storage and conversion devices is growing higher than ever. Zhang et al [12] employed a series of ionic surfactants to stabilize the GO sheets during high electrochemical window and due to their advantages of low volatility and high thermal the reduction process. They found that the surfactants can be successfully intercalated in both GO stability. Zhang et al [12] employed a series of ionic surfactants to stabilize the GO sheets during the and RGO to prevent the restack phenomena Their results indicate that for the same reduction process.
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