Abstract
Supercapacitors are promising alternatives for answering the thirst for ever increasing demand for power. They bridge the gap between the batteries and the conventional capacitors. Redox capacitors in the family of supercapacitors consist of conducting polymers or transition metal oxide electrodes. In this study, symmetric redox capacitors have been fabricated utilizing Polyaniline electrodes and a Polyvinylidenefluoride based gel polymer electrolyte. The effect of aniline concentration on the performance of redox capacitors was investigated. Aniline concentration was varied from 0.20 M to 0.50 M. Capacitors were characterized using Electrochemical Impedance Spectroscopy, Cyclic Voltammetry and Galvanostatic Charge-Discharge tests. Redox capacitor with 0.40 M aniline concentration showed the highest performance. From EIS measurements it was shown that the lowest relaxation time was 0.22 s. This implies that 0.40 M aniline system has the fastest ion movement behavior. Cyclic Voltammetry (CV) test of this capacitor resulted 81% of specific capacity retention between the 1 st and the 200 th cycle. Galvanostatic Charge-Discharge (GCD) for 1000 cycles showed an average discharging capacity of 323 F g -1 , power density of 760 W kg -1 and energy density of 6.5 Wh kg -1 . The results of this study confirm that aniline concentration has a significant effect on the performance of PANI films when they are served as electrodes in redox capacitors.
Highlights
Current and emerging electronic devices have exacerbated the need for improvements in performance of energy storage devices
By observing the Nyquist plots obtained by impedance data, the variation of charge transfer resistance and the bulk resistance with the aniline concentration of the PANI electrode can be determined
Redox capacitors based on PANI electrodes were fabricated with varying aniline concentration and the effect of the monomer concentration on the capacity was investigated
Summary
Current and emerging electronic devices have exacerbated the need for improvements in performance of energy storage devices. The effect of aniline concentration on the performance of PANI electrodes in a redox capacitor was investigated. Several redox capacitors were fabricated using electrodes prepared by varying aniline concentration.
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