Browsing by Author "Deraman, M"

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    COMPOSITE ELECTRODES OF ACTIVATED CARBON DERIVED FROM CASSAVA PEEL AND CARBON NANOTUBES FOR SUPERCAPACITOR APPLICATIONS
    (2014-07-01) Taer, Erman; Iwantono; Taslim, R; Subagio, A; Yulita, M; Salomo; Deraman, M
    In this paper, composite electrode was prepared from a mixture of activated carbon derived from the pre-carbonization of cassava peel (CP) and carbon nanotubes (CNTs). The activated carbon was produced by pyrolysis process with ZnCl2 as activation agent. The result of N2 adsorption-desorption analysis indicated that the BET surface area of the activated carbon was 1336 m2 g-1. Difference percentage of CNT of 0, 5, 10, 15 and 20% and 5% of PVDF binder were added into CP based activated carbon to fabricate the composite electrodes. The morphology and structure of the prepared composite electrodes were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The SEM observation revealed the CNT was distributed in homogeny between the carbon particles and XRD result shown the amorphous structure. The supercapacitor cells were fabricated by using composite materials as electrodes, 316L stainless steel as current collector and 1 M acid sulfuric as an electrolyte. Electrochemical characterization was performed by using electrochemical impedance spectroscopy (EIS) method using a solatron 1286 instrumentation. The addition of CNT has been improved the resistance and capacitive properties of supercapacitor cell.
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    EGGS SHELL MEMBRANE AS NATURAL SEPARATOR FOR SUPERCAPACITOR APPLICATIONS
    (2014-07-02) Taer, Erman; Sugianto; Iwantono; Dahlan, D; Deraman, M
    Various eggs shell membranes (ESMs) have been used as a separator for supercapacitor application. The separator was prepared from different membranes such as chicken eggs shell membrane (CESM), duck eggs shell membrane (DESM) and goose eggs shell membrane (GESM). The ESMs were tested as a separator in a two-electrode system, the sandwich-type supercapacitor cell consists of two activated carbon monoliths as electrodes, two stainless steel as current collectors and 1 M H2SO4 solution as an electrolyte. The electrochemical performance of the ESMs was characterized by an electrochemical impedance spectroscopy, a cyclic voltammetry and a galvanostatic charge-discharge. The results of this study exhibit all of the ESMs as a good candidate for supercapacitor separator. However, the CESM was shown excellence electrochemical properties, such as low resistance, high energy density and power density. The scanning electron microscope (SEM) micrograph and X-ray diffraction analysis were also proved that the ESMs are a promising low-cost separator for supercapacitor application
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    PREPARATION OF ACTIVATED CARBON MONOLITH ELECTRODES FROM SUGARCANE BAGASSE BY PHYSICAL AND PHYSICAL-CHEMICAL ACTIVATION PROCESS FOR SUPERCAPACITOR APPLICATION
    (2014-07-02) Taer, Erman; Iwantono; Manik, Saidul Tua; Taslim, R; Dahlan, D; Deraman, M
    Binderless activated carbon monoliths (ACMs) for supercapacitor electrodes were prepared from sugarcane bagasse by two different methods of physical and combination of physical-chemical activation process. The CO2 gas was used as physical activation agent and 0.3 M KOH was chosen as chemical activation agent. The ACMs were tested as electrodes in twoelectrode systems of the coin tape cell supercapacitor that consists of stainless steel as current collectors and 1 M H2SO4 as an electrolyte. The improving of resistive, capacitive and energy properties of combination of physical-chemical ACMs electrodes were shown by an impedance spectroscopy, a cyclic voltammetry and a galvanostatic charge-discharge method. The improving of resistive, capacitive and energy properties as high as 1 to 0.6 Ω, 141 to 178 F g-1, 3.83 to 4.72 W h kg-1, respectively. The X-ray diffraction analysis and field emission scanning electron microscope were performed to characterize the crystallite and morphology characteristics. The results showed that the combination of physical-chemical activation process have given a good improving in performance of the bagasse based ACMs electrodes in supercapacitor application
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    PREPARATION OF BINDERLESS ACTIVATED CARBON MONOLITH FROM PRE-CARBONIZATION RUBBER WOOD SAWDUST BY CONTROLLING OF CARB ONIZATION AND ACTIVATION CONDITION
    (2014-07-01) Taer, Erman; Deraman, M; Taslim, R; Iwantono
    Binderless activated carbon monolith (ACM) was prepared from pre-carbonized rubber wood sawdust (RWSD). The effect of the carbonization temperature (400, 500, 600, 700, 800 dan 900oC) on porosity characteristic of the ACM have been studied. The optimum carbonization temperature for obtaining ACM with high surface area of 600 oC with CO2 activation at 800 "C for one hour. At this condition, the surface area as high as 733 m2 g-1 could be successfully obtained. By improved the activation temperature at 900 oC for 2.5 h, it was found that the surface area of 860 m2g-1. For this condition, the ACM exhibit the specific capacitance of 90Fg-1. In addition the termogravimertic (TG)-differential termografimertic (DTG) and field emission scanning electron microscope (FESEM) measurement were also performed on the ACMs and the result has been studied. Finally, it was conclude that the high surface area of ACM from RWSD could be produced by proper selections of carbonization and activation condition.