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Figures 2d-e show SEM images of the OG layers once they have precipitated as a result of the addition of NaCl. These images clearly show the characteristic structure of graphene-like materials, which consists of randomly interconnected graphene-like sheets. Further information about oxidized graphene-like sheets dispersed in water was obtained by means of TEM microscopy. Thus, Figures S2 (a, b, c) show TEM images of flat OG sheets with lateral sizes of ∼ 0.5-1 μm. Examination of a large number of high-resolution TEM (HRTEM) images evidences that the OG sheets consist of only a few layers, most of which are bilayer. A selection of these HRTEM images is given in Figure 2 (f-i) and Figure S2 (d-i). During the EEG process, oxidation reactions occur extensively as a consequence of the attack of hydroxyl and oxygen radicals generated from the anodic oxidation of water on the edge and grain boundary sites of the graphite.[7d] This causes the formation of a large number of oxygen functional groups on the expanded graphite particles. The chemical composition of these samples was determined by elemental analysis. The results presented in Table S1 reveal that they have oxygen contents of around 20 wt.%, with (C/O) atomic ratio values of 4.6, 4.5 and 5.4 for EG, OG and EGR respectively (see Table S1). These results evidence the incorporation of numerous oxygen groups during the EEG process. As expected, the oxidized graphene sheets dispersed in water (OG) have the lowest (C/O) atomic ratio. This value is higher than the one typical of graphene oxide produced by means of the Hummers ́ method (C/O < 2), but it is much lower than that of reduced graphene oxide (C/O atomic ratio > 8). In short, on the basis of chemical composition, the OG sample resembles poorly reduced graphene oxide. Thermogravimetric analysis (TGA) 7PDF Image | Graphene from Electrochemically Exfoliated Graphite
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