Özet:

In this study, the electrochemical charge storage properties of poly(2,3-di(thiophene-3-yl)piperazine)-based conducting polymer derivatives were investigated for supercapacitor applications. For this purpose, novel 2,3-di(thiophene-3-yl)piperazine electroactive monomers were sonochemically synthesized and they were electrochemically polymerized on stainless steel substrates to prepare poly(2,3-di(thiophene-3-yl)piperazine (PTTP) and poly(2,3-di(thiophene-3-yl)decahydroquinoxaline (PTTQ)-based redox-active electrode materials. The capacitive performances of PTTP and PTTQ were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques. PTTP and PTTQ redox-active electrode materials achieved the specific capacitances of 175 Fg-1 and 198 Fg-1 at a constant current density of 2.5 mAcm-2. PTTP and PTTQ electrodes also delivered the energy densities of 70,2 Whkg-1 and 87,1 Whkg-1 and the power densities of 7 kWkg-1 and 6,2 kWkg-1. Besides, PTTP and PTTQ exhibited high long-term cycling stabilities (80% and 87,5% capacitance retentions). The results of capacitive performance tests reveal that PTTP and PTTQ electrode materials are promising redox-active materials for high-performance practical supercapacitor applications. 

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