Abstract
The effect of physical activation time in production of activated carbon electrodes from pineapple crown waste on the physical and electrochemical properties of supercapacitor cells has been demonstrated in this study. The samples were activated in the CO2 gas environment at a temperature of 900 °C with the activation time varied to 1.5; 2; 2.5 and 3 hours. Physical properties testing showed the activation time of 2.5 hours is the optimum activation time in the producing of carbon electrodes from pineapple crown waste. The optimum conditions are indicated by the minimum condition on the density and microcristalline height, and the maximum condition on specific surface area and carbon content, so it produce higest specific capacitance for supercapacitor cells. The optimum specific capacitance was found as high as 134 Fg−1. As a complement also has been analyzed the appearance of the surface morphology of the sample where the electrode is composed of carbon nanofiber with an average diameter of 90-164 nm.
Highlights
Electrochemical double layer capacitors (EDLC) are energy storage devices consisting of porous carbon electrodes, electrolyte, separator and current collectors [1]
The results showed that the carbon electrode from pineapple crwon produced supercapacitor cells as high as 134 F g-1 and found to contain dominant carbon fiber with a diameter size an average of 90-164 nm
The production of activated carbon electrodes from pineapple crown waste based on variation of activation time for supercapacitor device has been succesfully done
Summary
Electrochemical double layer capacitors (EDLC) are energy storage devices consisting of porous carbon electrodes, electrolyte, separator and current collectors [1]. Energy storage occurs because of the presence of ion and electron layers formed in the micro pore of the carbon electrode. The formation of ion and electron pairs is affected by the number of micro pores available in an electrode. Micro pores electrodes are relate to the materials and activation process. Power is related to the speed of ion diffusion process into the pores of the electrode to form ion-electron pairs. The pace of ion diffusion is clearly related to the shape of the electrode constituent material and pore size. Various shape of electrode constituent materials have been reported such as cubic [3,4,5], spherical, flat, fiber [6,7] provided in nano or micro sizes.
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