Fabrication and evaluation of an all solid redox capacitor with an iodine based gel polymer electrolyte
| Autor: | W.A.D.S.S. Weerasinghe, K. P. Vidanapathirana, C.M. Bandaranayake, Kumudu Perera |
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| Rok vydání: | 2017 |
| Předmět: |
Multidisciplinary
Materials science 02 engineering and technology Electrolyte Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology Electrochromic devices 01 natural sciences Capacitance 0104 chemical sciences Dielectric spectroscopy chemistry.chemical_compound chemistry Chemical engineering Propylene carbonate Cyclic voltammetry 0210 nano-technology Ethylene carbonate |
| Zdroj: | Journal of the National Science Foundation of Sri Lanka. 45:355 |
| ISSN: | 2362-0161 1391-4588 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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