The physical and electrochemical properties of activated carbon electrode made from Terminalia Catappa leaf (TCL) for supercapacitor cell application

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In this study, the utilization of TCL as raw material in production of carbon supercapacitor electrodes are focused on variations in carbonization temperature. Carbonization temperatures were varied by 500 °C, 600 °C, 700 °C, and 800 °C marked with the code TCL500, TCL600, TCL700 and TCL800 corresponding to the selection of carbonization temperature. All samples were activated using CO2 gas at 850 °C for 2 hours and 30 minutes. The density of the resulting carbon electrode was 0.776 gcm−3, 0.754 gcm−3, 0.738 gcm−3 and 0.762 gcm−3 for electrodes TCL500, TCL600, TCL700 and TCL800, respectively. The crystalline nature of the resulting carbon sample was found to be amorphous with 2θ 23.880°, 44.192° scattering angle, and stacking high (Lc) 8.482 Å for TCL700 samples. Lc data has been used to obtain a sample surface area and it was found as high as 1160.497 m2g−1. The morphology of the electrode surface has been tested using a SEM instrument. The elements content of the electrode have also been analyzed based on the EDS data. The optimum specific capacitance of carbon electrodes from TCL is obtained at a carbonization temperature of 700 °C as high as 54 Fg−1.