Supercapacitor device applications of reduced graphene oxide / polythiophene / polyvinyl alcohol nanocomposite and derivatives

Supercapacitors have a higher power energy density with a longer life than normal capacitors. Carbon or carbon-based, metal oxide and conductive polymers materials are also used in supercapacitors. In this thesis, it is aimed to improve the electrochemical performance and supercapacitor devices by synthesizing nanocomposites. In order to demonstrate their applicability on equivalent circuit models with dual electrode systems, GO, rGO, PTh, PVA, GO/PTh/KS, rGO/Pth/KS, GO/PTh/PVA, rGO/PTh/PVA, GO/PTh/PVA/KS, rGO/PTh/PVA/KS binary and ternary nanocomposites were successfully synthesized. Obtained nanocomposites scanning electron microscopy - energy dispersive x-ray spectroscopy (SEM-EDX), fourier transform infrared spectroscopy - reduced total reflection (FTIR-ATR), atomic force microscopy (AFM), thermogravimetric analysis - differential thermal analysis (TGA-DTA), was characterized in BET surface analysis characterization methods. Device performances were tested with 3 different methods using galvanostatic charge/discharge (GCD), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EES). Materials synthesized using 6 M KOH solution were created supercapacitor device. The highest specific capacitance was obtained as 10 A×g-1 at Csp= 65 F×g-1 for rGO/PTh/PVA/CB nanocomposite by GCD method.