Electrocoated Films of Poly(N-Methylpyrrole-co-2,2 '-Bithitiophene-co-3-(Octylthiophene)), Characterizations, and Capacitor Study

Abstract

N-Methylpyrrole (N-MPy), 2,2 '-bithiophene (BTh), and 3-(Octylthiophene) (OTh) were electrocopolymerized in 0.2M NaClO4/CH3CN on glassy carbon electrode (GCE). The resulting terpolymers of N-MPy, BTh and OTh in different initial monomer feed ratios such as [N-MPy](0)/[BTh](0)/[OTh](0)=1/1/1 and 1/2/5 were characterized by cyclic voltammetry (CV), Fourier-transform infrared attenuated total reflectance spectroscopy (FTIR-ATR), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), and electrochemical impedance spectroscopy (EIS). The capacitive behaviors of the modified electrodes were defined via Nyquist, Bode-magnitude, Bode-phase, and Admittance plots. The equivalent circuit model of Rs(C ( dl1 )(R ( 1 )(QR ( 2 ))))(C ( dl2 ) R ( 3 )) was performed to fit the theoretical and experimental data. The low-frequency capacitance (C-LF) were obtained from initial monomer concentrations of 50mM as C-LF=similar to 2.34x10(-4) mFcm(-2) for P(N-MPy), C-LF=5.06x10(-4) mFcm(-2) for P(BTh), C-LF=5.07 mFcm(-2) for P(OTh), and C-LF=similar to 3.78 m Fcm(-2) for terpolymer for [N-MPy](0)/[BTh](0)/[OTh](0)=1/1/1. The terpolymer may be used as energy storage devices. [GRAPHICS]