Browsing by Author "Hamdan E."
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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). - Some of the metrics are blocked by yourconsent settings
Publication Hybrid Solid Polymer Electrolyte From Diapers As Separator For Electrochemical Double Layer Capacitor (EDLC)(American Institute of Physics Inc., 2018) ;Hashim M.A. ;Nadhrah Md Yatim ;Mahmud N.A.C. ;Sazali N.E.S. ;Hamdan E. ;Yahya M.A. ;Ngah C.W.Z.C.W. ;Suhaimi S. ;Faculty of Science and TechnologyUniversiti Sains Islam Malaysia (USIM)EDLC was fabricated using hybrid solid polymer electrolyte from PVA-diapers and an activated carbon powder as electrode by using solution casting method. For comparison, four types of EDLC cells were constructed and tested. It was found that an EDLC with a PVA-diapers (60:40) polymer electrolyte exhibited much higher capacitance and longer cycle-life. The electrocapacitive properties of the supercapacitor (P50HD50, P60HD40, P70HD30 and P80HD20) were done using electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and galvanostatic charge discharge (GCD). Results from these analysis showed that P60HD40 cell had recorded excellent rate capability and highest Csp value of 179 F g-1 (EIS), 50 F g-1 (CV), 328 F g-1 (GCD) respectively. Futher, results from ESR (GCD) analysis showed that P60HD40 composition of PVA/H3PO4 liquid electroyte gave a lower value of 88.05 ? in the supercapacitor cell compared with another cells.