RGO, rGO/MnO2, rGO/CuO, rGO/MnO2/PANI, rGO/CuO/PANI binary and ternary nanocomposi̇te synthesis, supercapacitor applications

Nowadays, supercapacitors have been gained more importance than conventional capacitors due to their high power and energy densities and long lifetimes. Carbon and carbon-based materials, conductive polymers and metal oxides are generally used as electrode active materials for supercapacitors. The aim of this thesis study is to develop supercapacitor devices with new electrode active materials. Applicability of two electrode systems on supercapacitor devices were successfully showed with the synthesis of rGO, rGO/MnO2, rGO/CuO, rGO/MnO2/PANI, rGO/CuO/PANI binary and ternary nanocomposites. They were characterized using various characterization methods, such as SEM-EDX, FTIR-ATR, TGA-DTA, Four-point probe conductivity measurements and BET surface analysis. Electrochemical performances (cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS)) measurements were carried out by designing supercapacitor devices. Stability tests were performed up to 1000 cycles and long-term stability of supercapacitor devices were carried out. In addition, electrical parameters were examined by fitting the theoretical and experimental data with equivalent circuit model analyses of R(C(R(QR)))(CR).