Apart from the interfacial strength, the aspect ratio of the filler is another key parameter that dominates the efficiency of stress transfer, i.e., reinforcement performance . Young et al. suggested that strong graphene-polymer interfaces and aligned GNPs with high aspect ratios contribute to the best reinforcement in nanocomposites. Electrochemical exfoliation of graphite is thought as one promising route for mass production of relatively large flake sizes, and has been of interest in recent years . The procedure involves graphite working as the anode for intercalation, a metal mesh as the cathode, electrolytes to assist the exfoliation and a power supply to provide the current . With a constant voltage applied, the positively charged graphene layers react immediately with nucleophilic water molecules, with the intercalation occurred and hydroxyl groups formed, and also possibly with a secondary chemical reaction leading to epoxides C-O-C , as shown in Fig. . Regarding the electrolyte, sulphuric acid stands out with its high exfoliation efficiency .