Preliminary study on the performance of a redox capacitor with the use of ionic liquid-based gel polymer electrolyte and polypyrrole electrodes

Redox capacitor, which is one type of supercapacitor, has been attracted tremendously as it shows a satisfactory specific capacitance, good cycle ability, and stability. The present study reveals redox capacitor fabricated with an ionic liquid (IL)-based gel polymer electrolyte (GPE). Electrodes the were conducting polymer, polypyrrole (PPy). composition GPE was polyvinylidenefluoride–co-hexafluoropropylene (PVdF–co-HFP): 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (1E3MITF): ZnTF. Characterization done by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) galvanostatic charge–discharge (GCD) tests. relaxation time constant (?0) about 31.57 s implying somewhat fast reactions. Initial single electrode capacitance (CSC) 150.2 Fg?1, at 500th cycle, 40.03 Fg?1. decrease CSC may be due to formation passivation layer GPE/electrode interface, resulting in degradation upon cycling. GCD test resulted 48.4 Fg?1 initial single-electrode discharge (Csd) value. Upon 1000 cycles, reached 22.3 Csd IL-based prolonged