Graphene–polyethylenedioxythiophene conducting polymer nanocomposite based supercapacitor

• Published in: Electrochimica acta 2011-10, Vol.56 (25), p.9406-9412
• Main Authors: Alvi, Farah, Ram, Manoj K., Basnayaka, Punya A., Stefanakos, Elias, Goswami, Yogi, Kumar, Ashok
• Format: Article
• Language: English
• Subjects: Applied sciences; Capacitance; Capacitors; Capacitors. Resistors. Filters; Charge/discharge; Conducting polymer; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrochemical impedance spectroscopy; Exact sciences and technology; Graphene; Nanocomposite; Nanocomposites; Nanomaterials; Nanostructure; PEDOT; Scanning electron microscopy; Supercapacitor; Supercapacitors; Various equipment and components
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2011.08.024

Schematic diagrams of an electrochemical double layer type capacitor showing the charged (left) and discharged (right) states. [Display omitted] ► The Graphene-PEDOT nanocomposite based smart coating has shown the excellent redox properties in acidic, organic electrolytes, which is promising for suprecapcitor application. ► The electrochemical impedance studies have also been estimated which clearly indicates the high conductivity and less charge transfer resistance in the synthesized material. ► The specific capacitance of 380F/g have been calculated for G-Pedot material, also it shows the columbic efficiency of 95% for 800 cycles, which tells the remarkable stability of synthesized material. We present here the synthesis, characterization and application of graphene (G)–polyethylenedioxythiophene (PEDOT) nanocomposites as electrode material for supercapacitor applications. The G-PEDOT nanocomposite was synthesized using a chemical oxidative polymerization technique, and characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, FTIR spectroscopy, X-ray-diffraction, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) techniques. The electrochemical charge/discharge characteristics of G-PEDOT nanocomposites were investigated in different electrolytic media, and the specific discharge capacitance was estimated to be 374 Farad/gram (F/gm). This manuscript presents the capacitance studies on supercapacitor G-PEDOT electrode with respect to stability of material, specific capacitance, electrical conductivity and specific charge/discharge properties of the supercapacitor electrodes. Our study has revealed that the G-PEDOT nanocomposite could be a transformable and viable electrode material for supercapacitor applications.