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aqueous dispersion formed by oxidized graphene layers (OG). An aqueous dispersion formed by graphene sheets was easily obtained through the “in-situ” reduction of the dispersed OG layers by applying the procedure reported by Li et al. [3] In this way, a processable and stable aqueous dispersion of graphene sheets was obtained. In order to demonstrate the easy processability of the graphene aqueous dispersion, two types of macroscopic graphene structures were prepared: graphene aerogels and graphene films. These materials were successfully employed as absorbents for removing organic liquids in the case of aerogels and as electrodes in double-layer electrochemical capacitors in the case of the graphene films. 2. Results and Discussion 2.1. Characteristics of the products obtained from the electrochemical exfoliation of graphite The electrochemical exfoliation was carried out in a two-electrode cell by using a graphite rod as anode and platinum mesh as cathode, the DC voltage between both electrodes being of 10 V (see Figure S1 in Supporting Information). In these experiments an aqueous solution of (NH4)2SO4 (0.2 M), which has been demonstrated to be an efficient exfoliation salt was used as electrolyte.[8b] It was observed that ∼ 25 wt.% of the starting graphite is consumed due to the oxidation reactions during the EEG process.[7d] The yield was therefore around 75 wt.%, which is in agreement with the results reported by other authors.[8b] In order to prepare a processable colloidal suspension, the expanded graphite produced by the EEG process was sonicated in water, and then subjected to centrifugation to remove the unexfoliated particles. In this way, 5PDF Image | Graphene from Electrochemically Exfoliated Graphite
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