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μm, as can be seen from by the TEM images in Figures 5d and S4 (a-c). The HRTEM images obtained for a large number of ROG sheets show that they consist of one layer or just a few layers (< 7), two-layer sheets being the most common, which is consistent with the results obtained for the OG sample (Figures 5f-i and Figures S4d-i). This result agrees with the observations of other authors describing graphene sheets obtained from the electrochemical exfoliation of graphite flakes.[7d, 8b, 18] The structural characteristics of the ROG sample were evaluated by means of X-ray diffraction and Raman spectroscopy. The XRD pattern corresponding to a ROG film (graphene paper obtained by filtration) exhibits a low intensity peak at 23.9o (dspacing ∼ 0.37 nm) which denotes a certain re- stacking (Figure 3c). On the other hand, the Raman spectrum in Figure 3d reveals that the (ID/IG) ratio is slightly smaller for ROG (ID/IG=1.61) than for OG (ID/IG=1.76), which suggests a certain decrease in the number of defects as a consequence of the removal of oxygen groups. In order to demonstrate the processability of the ROG aqueous dispersion, we used it to prepare two types of macroscopic graphene structures: a graphene aerogel (GA) and a graphene film. In the following sections, we shall discuss the characteristics of both types of materials and their potential as adsorbents and as electrodes in supercapacitors. 2.3. EEG-based graphene aerogels as efficient sorbents for organic liquids A graphene aerogel (GA) was fabricated from the RGO dispersion by means of a freeze-drying process that involves its rapidly being frozen by being 12PDF Image | Graphene from Electrochemically Exfoliated Graphite
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