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.2024-05-282024-05-2820161742658810.1088/1742-6596/739/1/0120862-s2.0-84991489621https://www.scopus.com/inward/record.uri?eid=2-s2.0-84991489621&doi=10.1088%2f1742-6596%2f739%2f1%2f012086&partnerID=40&md5=f7f66154bef7432ea40cab0a7b8d998bhttps://oarep.usim.edu.my/handle/123456789/9148We 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).en-US739112086