The need of energy storage devices with higher rating for wider application range has led to a great interest among engineers and researchers in proposing better materials and preparation methods for the devices' electrodes. The paper reports our current research progress in developing a new higher rating energy storage device like an electric double-layer capacitor. New carbon materials were systematically prepared by a quick and low cost method of chemical reaction between insulating oil and high concentration sulphuric acid. The graphitic nature of the produced carbon materials were characterised by X-ray diffraction (XRD) measurement. Essential electrical properties of the carbon materials for energy storage application, such as their capacitive behavior, were investigated by cyclic voltammetry (CV) measurement. In order to observe the frequency characteristics of the carbon materials, one of the most important analytical tools known as electrochemical impedance spectroscopy (EIS) was used. The experimental results of the XRD, CV and EIS measurements are presented in forms of graphical plot.
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