Browsing by Author "Jasni M.R.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). - Some of the metrics are blocked by yourconsent settings
Publication Supercapacitor electrodes from activation of binderless green monoliths of biomass self-adhesive carbon grains composed of varying amount of graphene additive(Institute for Ionics, 2018) ;Jasni M.R.M. ;Deraman M. ;Suleman M. ;Zainuddin Z. ;Othman M.A.R. ;Chia C.H. ;Hashim M.A. ;Faculty of Science and Technology ;Universiti Kebangsaan Malaysia (UKM)Universiti Sains Islam Malaysia (USIM)Binderless electrodes of activated carbon monoliths (ACMs) and its composites with graphene are prepared by carbonization and activation of green monoliths consisting of self-adhesive carbon grains and 0�10�wt% KOH-treated graphene. Compared with ACMs, the optimized composite containing 6�wt% graphene exhibits more ordered micro-structures with increased crystallite height, and graphitic sp2 carbons (ID/IG�=�0.49 vs. 0.91) along with enhanced porosity; as revealed by X-ray diffraction, Raman, and N2 adsorption-desorption studies. These modifications lead to increased electrical conductivity (13 vs. 9�S�cm?1) through improved interconnections of carbon particles by graphene, and surface area�~�(800 vs. 456�m2�g?1) due to increased inter-particle spacing. Further, contrary to ACMs, the composite electrodes can offer faster delivery of energy in almost 50% less response time (5 vs. 8�s) due to reduced equivalent series resistance (1.67 vs. 2.65�?) and charge transfer resistance (0.55 vs. 1.33�?). � 2017, Springer-Verlag GmbH Germany.