Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi Üniversitesi, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2019
Thesis Language: Turkish
Student: MÜGE ÖZBAKIŞ
Supervisor: MUZAFFER BALBAŞI
Abstract:In this study, the energy storage performance of a symmetrical supercapacitor is compared by using activated carbon as electrode and activated carbon with conductive polymer doping. The conductive polymer was synthesized by chemical method and the supercapacitor compared with performance criteria such as cycle life, load storage capacity, energy density and power density. In this study, cyclic voltammetry, galvanic charge-discharge and selfdischarge techniques were utilized. Electrochemical performance of activated carbon / polyaniline (PANI) composite supercapacitor electrodes were investigated in gelatinised 1.0 M H2SO4 electrolyte. The crude PANI-HCl salt was prepared by the chemical polymerization method and treated with 0.1 M trifluoromethanesulfonic acid (TFA) and 25% ammonia, respectively. The capacitance values of PANI-HCl, PANI-TFA and PANINH3 doped activated carbon composite electrodes were found to be 101 F/g, 131 F/g and 171 F/g, respectively. The activated carbon / PANI-HCl composite electrode performed at least two times better than the reference active carbon electrode with a capacity of 56 F / g. As a result of the apparent capacitive effect, the activated carbon / PANI-NH3 composite electrode showed about 3 times better capacitance than the reference activated carbon electrode. The Ragon graph showing the relationship between energy and power density clearly explains the apparent capacitive contribution. In addition, the best performing PANINH3 doped activated carbon composite electrodes were studied by changing the percentage of additives. Capacitance values of activated carbon, 10% PANI-NH3 doped, 30% PANINH3 doped and 50% PANI-NH3 doped electrodes were 44,47 F/g, 85,69 F/g, 208,24 F/g and 376 F/g Was found to be 67 F/g. Thus, 50% PANI-NH3 exhibited a specific capacitance of approximately 8 times the active carbon electrode, 50 times the specific power, and 8.5 times the specific energy value.