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- W2780832004 abstract "Gel polymer electrolytes (GPEs) have demonstrated a greater potential to be used as electrolytes for various applications such as batteries, super capacitors, electrochromic devices and dye sensitised solar cells. They consist of a salt and a mixture of solvents trapped in a polymer matrix. In this study, optimisation and characterisation of a GPE consisting of polyvinylidene fluoride, ethylene carbonate, propylene carbonate and sodium iodide and its application in a redox capacitor with two polypyrrole electrodes was studied. GPE shows a conductivity of 9.69 × 10-3 Scm-1 at room temperature (28 °C) with good mechanical stability. The corresponding composition is 1.13 PVdF : 2.5 EC : 2.5 PC : 0.4 NaI (by weight). The variation of conductivity with temperature follows Arhenius behaviour suggesting that the conductivity mechanism takes place via hopping of ions. Conductivity is purely ionic in nature. Properties of the redox capacitors were studied by the cyclic voltammetry (CV) technique, electrochemical impedance spectroscopy (EIS) technique and galvanostatic charge-discharge (GCD) test. The CV results showed the dependency of specific capacitance on the scan rate. The EIS results showed that capacitive behaviour becomes dominant only at low frequency range. The resulting specific capacitance was 3.19 Fg-1. It was found that the redox capacitor exhibits an average discharge specific capacitance of 5.93 Fg-1 while having a specific energy density of 0.03 Whkg-1 and a specific power density of 0.42 Wkg-1." @default.
- W2780832004 created "2018-01-05" @default.
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- W2780832004 date "2017-12-27" @default.
- W2780832004 modified "2023-09-25" @default.
- W2780832004 title "Fabrication and evaluation of an all solid redox capacitor with an iodine based gel polymer electrolyte" @default.
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- W2780832004 doi "https://doi.org/10.4038/jnsfsr.v45i4.8229" @default.
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