Abstract
The electrode composition material in the supercapacitor affects the storage performance of the supercapacitor. In this study, the electrodes were made from coconut shell activated carbon and Fe3O4 from iron sand. To be used as electrodes, the two materials are mixed with PVDF and a solution of Dimethylacetamide at a temperature of 70°C; then, a coating process is carried out by layering the electrode material onto aluminium foil to obtain an electrode sheet. The coin cell assembling process was then carried out by arranging the electrode sheets and the Celgard Li-ion battery separator in the glove box and then tested for charge/discharge with a current density of 5-81 mA/g and cycle stability at a current of 20 mA/g. The study results show that the activated carbon/5 wt% Fe3O4 supercapacitor has the best capacitance value for charging at 8.03 F/g and discharging at 8.55 F/g at a current density of 5 mA/g. The activated carbon/5 wt% Fe3O4 supercapacitor has cycle stability of up to 200 cycles and can withstand up to 95% with a capacitance of 6.6 F/g.
Highlights
At this time, many electronic devices require electrical energy storage devices such as electric cars, electric bicycles, cell phones, and laptops
Phase analysis can be done by matching the X-Ray Diffraction (XRD) data with the database in the Match software, namely powder diffraction file (PDF) no 96-900-7645
The results of the Brunauer Emmet Teller (BET) test show that the surface area of the sample is 320.626 m2/g; this value is relatively good if applied as a supercapacitor electrode material
Summary
Many electronic devices require electrical energy storage devices such as electric cars, electric bicycles, cell phones, and laptops. The battery on the market is not environmentally friendly (toxic), which causes environmental pollution. Energy storage devices that are efficient and environmentally friendly are desirable. Supercapacitors are efficient energy storage devices because of their enormous power density and charge storage capacitance, fast and long-lasting charging processes with excellent cycle life compared to conventional batteries and capacitors [1]. The supercapacitor component consists of two electrodes and a separator [2]. The supercapacitor electrode can be activated carbon [3]. Alloys with metal oxides such as Fe3O4 are needed in addition to their high electrical conductivity, affordable prices, and environmentally friendly [4]. Chen et al [5] succeeded in making Fe3O4/biocarbon electrodes from bagasse (Saccharum officinarum L) with various mass ratios (0.5:1; 0.75:1; 1:1; 1.5:1) Fe3O4
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