Among the various oxygen functional groups, phenols, carboxylic acid, anhydride and lactones are categorized under acidic oxygen functionalities. On the other hand, groups such as pyrone, aldehyde, quinone and pyrone are classified under basic oxygen functionalities while cyclic ethers are included under neutral oxygen functionalities. It is feasible to evaluate the pseudocapacitance from the particular oxygen bearing functional group. For instance, two-fold increase in the capacitance was observed in acidic electrolyte by quinone functionalities as one quinone groups consume two electrons in one redox process . From the variety of functional substituents in RGO such as phenolic, carboxylic acid and quinone, COOH groups are thermally unstable and eradicated when GO was subjected to calcination at 250 °C that giving rise to the greater cyclic stability for RGO in alkaline electrolyte . Hence it has been proposed that the pseudocapacitance in carbon materials is enriched by incorporating the hydrophilic nature due to the increased contribution of phenolic and quinone groups. It was reported that the carboxylic acid at the edges of graphene nanoplatelets demonstrated the excellent capacitive nature in 1 M H2SO4 solution because N-doping is promoted by the contribution of carboxylic acid functionalities over . To deliver high capacitance by carbon materials, the role of specific oxygen functional groups is highly essential.