Present work demonstrates enhanced supercapacitive performance of CoO-rGO electrode using redox electrolyte. The long range electrostatic force developed during deposition of CoO-rGO composite thin film orient the molecules into the hexagonal crystal structure. The incorporated CoO particles into rGO nano-sheets make the structure more porous for the intercalation of the electrolyte ions through the electrode material. Additionally, 0.025 M K-3[Fe(CN)(6)] + 0.025 M K-4[Fe(CN)(6)] redox couple into KOH electrolyte enhances the supercapacitive performance than bare KOH electrolyte. The maximum specific capacitance of 1005 F g(-1) is observed due to the combined effect of K-3[Fe(CN)(6)] and K-4[Fe(CN)(6)] redox couple into KOH electrolyte. Also, energy density of 86.74 Wh kg(-1) at power density of 3.54 kW kg(-1) suggest potential application of CoO-rGO composite thin film in the development of high energy density supercapacitor based on redox active electrolyte. (C) 2018 Elsevier Inc. All rights reserved.