Browsing by Author "Hanappi M.F.Y.M."
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Publication Electric double-layer capacitors with tea waste derived activated carbon electrodes and plastic crystal based flexible gel polymer electrolytes(Institute of Physics Publishing, 2016) ;Suleman M. ;Deraman M. ;Othman M.A.R. ;Omar R. ;Hashim M.A. ;Basri N.H. ;Nor N.S.M. ;Dolah B.N.M. ;Hanappi M.F.Y.M. ;Hamdan E. ;Sazali N.E.S. ;Tajuddin N.S.M. ;Jasni M.R.M. ;Faculty of Science and Technology ;Universiti Kebangsaan Malaysia (UKM)Universiti Sains Islam Malaysia (USIM)We report a novel configuration of symmetrical electric double-layer capacitors (EDLCs) comprising a plastic crystalline succinonitrile (SN) based flexible polymer gel electrolyte, incorporated with sodium trifluoromethane sulfonate (NaTf) immobilised in a host polymer poly (vinylidine fluoride-co-hexafluoropropylene) (PVdF-HFP). The cost-effective activated carbon powder possessing a specific surface area (SSA) of ? 1700 m2g-1 containing a large proportion of meso-porosity has been derived from tea waste to use as supercapacitor electrodes. The high ionic conductivity (?3.6�10-3 S cm-1 at room temperature) and good electrochemical stability render the gel polymer electrolyte film a suitable candidate for the fabrication of EDLCs. The performance of the EDLCs has been tested by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and galvanostatic charge-discharge studies. The performance of the EDLC cell is found to be promising in terms of high values of specific capacitance (?270 F g-1), specific energy (? 36 Wh kg-1), and power density (? 33 kW kg-1).