A Comparative Study on Substituted Polyanilines for Supercapacitors
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A Comparative Study on Substituted Polyanilines for Supercapacitors Punya A. Basnayaka1, Farah Alvi2, Manoj K. Ram3, 4, Robert Tufts3 and Ashok Kumar1,3, 1
Department of Mechanical Engineering, Department of Electrical Engineering, 3 Nanotechnology Research and Education Center, 4 Clean Energy Research Center, University of South Florida, Tampa, Florida, 33620, USA. 2
ABSTRACT The effect of two substituent groups, ortho-methoxy (-OCH3) and methyl (-CH3) in aniline, have been studied for supercapacitor applications. The polyaniline (PANI), poly (oanisidine) (POA) and poly (o-toluidine) (POT) have been synthesized by oxidative polymerization method, and characterized by Cyclic Voltammetry (CV), UV–visible spectroscopy, Raman spectroscopy, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) techniques. The specific capacitance, charging/discharging and electrochemical impedance characteristics of the supercapacitor fabricated using PANI, POA, as well as POT electrodes are evaluated in 2M H2SO4 electrolytic media. The highest specific capacitance of 400 F/g is calculated for PANI, whereas, POA and POT have exhibited 360 F/g and 325 F/g capacitance in supercapacitor studies. INTRODUCTION Polyaniline (PANI) has become versatile electrochemical material due to reversibility, high electrical, chemical properties, ease of synthesis and high environmental stability [1-2]. It is being used for several technological oriented applications such as in sensors, corrosion protecting coatings and supercapacitors [3-4]. Recently, PANI has been considered as the most attractive material as supercapacitor electrode due to high capacitance and conductivity compared with polypyrrole and polythiophene conducting polymers (CPs). The composite materials based on PANI, graphene (G)/PANI, carbon nanotube/PANI have been extensively studied for supercapacitors [5-7]. These PANI-based nanocomposites have shown higher capacity and higher chemical stability than pristine PANI for supercapacitors applications [8]. However, practical use of PANI has been limited by the insolubility in organic solvents due to the delocalized π - bonds along their backbone [9]. The derivatives and copolymers of polyanilines have been applied for various applications due to the enhancement of processability. We understand the need for new material with promising electrochemical properties is a major goal for energy storage applications. We have aimed to investigate the charge storage capability of PANI derivatives. PANI, POA; a methoxy group in ortho position of PANI and POT; a methyl group in ortho position in aniline monomer, are studied in detail as supercapacitor electrode materials. POA and POT derivatives of PANI have been synthesized by chemical oxidative polymerization method. These derivatives are characterized using scanning electron microscope (SEM), UV-visible spectroscope, Raman spectroscope techniques. The electrochemical behavior of fabricated supercapacitor of polyaniline derivatives have been compared at length.
EXPERIMENTA
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