Novel preparation of expanded nano-graphene-based electrodes for EDLC and their improved electrochemical performance

The electrode rawmaterials in this work were composed of expanded nano-graphene (ENG)-based active carbon (YP50F) named YEG as an active material; Super-P carbon black (SPB) as an electric conductor; and styrene-butadiene rubber (SBR), sodium salt of carboxymethyl cellulose (CMC), and polytetrafluoroethylene ((C2F4)(n), PTFE) as mixed binder materials. We characterized the prepared electrodes by X-ray diffraction, scanning electron microscopy, and Raman spectroscopic techniques. Finally, we examined the electrochemical performances of carbon materials in an electrolyte solution of tetraethylammonium tetrafluoroborate ((C2H5)(4)NBF4, TEABF4) in propylene carbonate (C4H6O3, PC). The specific capacitance remains the same for smaller values of YEG in the composite electrodes. These results also provide evidence of the optimum loading of ENG in future graphene-based EDLCs.