Electrochemical double layer capacitors with PEO and Sri Lankan natural graphite

Jayamaha, Bandara; Dissanayake, Malavi A.K.L.; Vignarooban, Kandasamy; Vidanapathirana, Kamal P.; Perera, Kumudu S.

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자료유형: 학술저널

저자정보: Jayamaha, Bandara (Department of Physics, University of Jaffna) Dissanayake, Malavi A.K.L. (National Institute of Fundamental Studies) Vignarooban, Kandasamy (Department of Physics, University of Jaffna) Vidanapathirana, Kamal P. (Department of Electronics, Wayamba University of Sri Lanka) Perera, Kumudu S. (Department of Electronics, Wayamba University of Sri Lanka)

저널정보: 테크노프레스 Advances in energy research Advances in energy research 제5권 제3호

발행연도: 2017.1

수록면: 219 - 226 (8page)

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Electrochemical double layer capacitors (EDLCs) have received a tremendous interest due to their suitability for diverse applications. They have been fabricated using different carbon based electrodes including activated carbons, single walled/multi walled carbon nano tubes. But, graphite which is one of the natural resources in Sri Lanka has not been given a considerable attention towards using for EDLCs though it is a famous carbon material. On the other hand, EDLCs are well reported with various liquid electrolytes which are associated with numerous drawbacks. Gel polymer electrolytes (GPE) are well known alternative for liquid electrolytes. In this paper, it is reported about an EDLC fabricated with a nano composite polyethylene oxide based GPE and two Sri Lankan graphite based electrodes. The composition of the GPE was [{(10PEO: $NaClO_4$) molar ratio}: 75wt.% PC] : 5 wt.% $TiO_2$. GPE was prepared using the solvent casting method. Two graphite electrodes were prepared by mixing 85% graphite and 15% polyvinylidenefluoride (PVdF) in acetone and casting n fluorine doped tin oxide glass plates. GPE film was sandwiched in between the two graphite electrodes. A non faradaic charge discharge mechanism was observed from the Cyclic Voltammetry study. GPE was stable in the potential windows from (-0.8 V-0.8 V) to (-1.5 V-1.5 V). By increasing the width of the potential window, single electrode specific capacity increased. Impedance plots confirmed the capacitive behavior at low frequency region. Galvanostatic charge discharge test yielded an average discharge capacity of $0.60Fg^{-1}$.

#gel polymer electrolyte #graphite #electrochemical double layer capacitors #cyclic voltammetry #electrochemical impedance spectroscopy #galvanostatic charge discharge #nyquist plots #super capacitors

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