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Aqueous Dispersions of Graphene from Electrochemically Exfoliated Graphite Marta Sevilla, Guillermo A. Ferrero and Antonio B. Fuertes* Instituto Nacional del Carbón (CSIC), P.O. Box 73, Oviedo 33080, Spain *Corresponding author: abefu@incar.csic.es Abstract This work presents a facile and environmentally-friendly synthesis strategy for the production of stable and easily processable dispersions of graphene in water. This strategy represents an alternative to the classical chemical exfoliation methods (v.g. Hummers ́ method), which are more complex, harmful and dangerous. The process is based on the electrochemical exfoliation of graphite and includes three simple steps: (a) the anodic exfoliation of graphite in (NH4)2SO4, (b) sonication to separate the oxidized graphene sheets and (c) reduction of the oxidized graphene to graphene. The procedure involves relatively short processing times and allows high yields, making it possible to convert around 30 wt.% of the initial graphite into graphene. The graphene sheets are well-dispersed in water, have a C/O atomic ratio of 11.7, a lateral size of ∼ 0.5-1 μm and they contain only a few graphene layers, most of which are bilayer sheets. The processability of this type of aqueous dispersion has been demonstrated in the fabrication of macroscopic graphene structures, such as graphene aerogels and graphene films, which have been successfully employed respectively as absorbents or as electrodes in supercapacitors. Keywords: Graphene, graphite, electrochemical exfoliation, aqueous dispersion. 1PDF Image | Graphene from Electrochemically Exfoliated Graphite
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