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very low ID/IG value of 0.1, reflecting its highly ordered structure. By contrast, the samples produced by the EEG process (e.g. EG and OG) show high values of ID/IG that reveal the presence of significant structural defects in the carbon lattice, which can be ascribed to the reduction in size of the in-plane sp2 domains as a result of the oxidation processes.[15] 2.2. Processable aqueous graphene colloidal suspensions from electrochemically exfoliated graphite In 2008, Li et al. demonstrated that is possible to produce stable and processable colloidal suspensions of graphene sheets dispersed in water by means of the reduction of a diluted aqueous dispersion of graphene oxide with hydrazine in the presence of ammonia.[3] In the present work, we have adopted a similar strategy and demonstrate the viability of the production of stable aqueous dispersions of graphene based on the EEG process. Our experiments reveal that the application of the Li ́s procedure to a diluted dispersion of OG sheets (0.5 mg/mL) can produce a colloidal suspension of graphene sheets that we have identified as reduced oxidized graphene and denoted as ROG. The resulting dispersion of graphene sheets has a concentration of around 0.3-0.4 mg/mL. Due to the reduction reactions, a large number of O-groups disappear and, in consequence, the (C/O) atomic ratio increases from 4.5 for OG to 11.7 for ROG (see Table S1), a typical value for graphene materials obtained by the chemical reduction of graphene oxide.[16] The reduction process partially restores the electronic conjugation of the graphene layers as evidenced by the UV-vis spectra in Figure 4, which show in the case of the reduced sample an increase in absorbance over the whole wavelength range and a displacement of the absorption peak (π-π* transitions of aromatic C-C bonds) from 267 nm for 10PDF Image | Graphene from Electrochemically Exfoliated Graphite
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