Abstract
This work describes the performance of a gel polymer electrolyte (GPE) based redox capacitor using the cyclic voltammetry technique.GPE was prepared with 22.5 wt% polyacrylonitrile (PAN), (1:1weight ratio) ethylene carbonate (EC) and propylene carbonate (PC) having a salt concentration of 1.0 M sodium iodide (NaI). Dependence of ionic conductivity of GPE on temperature was investigated using ac impedance spectroscopy. Two polypyrrole (PPy) electrodes were used as the electrodes of the redox capacitor. The performance of the device was evaluated by cyclic voltammetry. The redox-capacitors were cycled at different scan rates to determine the scan rate at which the maximum capacitance is obtained. After tracking that scan rate, continuous cycling was carried out at that scan rate to investigate the deterioration of capacitance upon cycling. The room temperature conductivity (σ) of the GPE was 4.29 × 10 -3 S cm -1 . The conductivity variation with temperature followed the Arrhenius behavior. From the scan rates selected for the study, the maximum capacity could be obtained at the scan rate of 30 mV s -1 . The average specific capacity of the redox capacitor was 26.70 Fg -1 .
Highlights
There has been a rapid growth in research and development in the area of gel polymer electrolytes (GPEs) all over the globe[1,2,3]
GPE prepared with 22.5 % PAN and 1.0 M NaI in 1:1 ethylene carbonate (EC):propylene carbonate (PC) solution was mechanically stable to handle for applications
The graph shows a linear pattern suggesting that conductivity behavior of GPE with temperature follows Arrhenius behavior[13]
Summary
There has been a rapid growth in research and development in the area of gel polymer electrolytes (GPEs) all over the globe[1,2,3]. GPEs are expected to have high ionic conductivity as well as good dimensional stability They are prepared by incorporating a liquid electrolyte in to a host polymer matrix that is capable of forming a stable film[4]. GPEs are having good mechanical properties, no leakage problems and no evaporation Because of these properties, many potential applications of GPEs in electrochemical devices such as super-capacitors, batteries and solar cellscan be found. Super-capacitors are energy and power storage devices that have technical and economic advantages in a diverse range of consumer and industrial applications[5,6]. They have high power capability than batteries and high energy capability than conventional capacitors. They are associated with well-known disadvantages of corrosion, self- discharge and low energy density etc
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