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Graphene oxide/Co3O4 nanocomposites were synthesised by a hydrothermal method. The structural properties of the above nanocomposite were elucidated by powder X-ray diffraction analysis. The functional group in the graphene oxide/Co3O4 nanocomposite was confirmed by FTIR spectral analysis. The morphological properties of the graphene oxide-Co3O4 nanocomposites were studied by SEM analysis. The elemental compositions of these samples were estimated by EDAX studies. UV, TGA, and Raman were used to assess the crystal nature, morphology, and chemical states of the prepared graphene oxide/Co3O4 nanocomposite, and the electrochemical performance was tested using CV of the prepared nanocomposite materials as supercapacitor electrodes. The electrochemical results showed that the graphene oxide/Co3O4 nanocomposite is a good material for a supercapacitor electrode. AC conductivity’s dielectric properties of charge energy − 2.5318 × 10–6 [ABSTRACT FROM AUTHOR]

Activated carbon is prepared from coconut shell by heating it around 500 °C for 2 h in a muffle furnace. This method is one of the easiest and most economical methods for the synthesis of Activated carbon. The dried coconut shell is carbonized and it is treated with KOH in the ratio of 1:3 carbon-activating agent (KOH) and the resulting slurry is dried in an oven at 60 °C for overnight. The dried mass is further activated at 450 °C then it is washed with an acid solution to remove KOH. The surface area of the synthesized activated carbon can be obtained by using nitrogen absorption-desorption experiment. Conducting polymer such as polyaniline prepared by oxidative polymerization of the respective monomer in tetrafluoroboric acid solution using potassium persulphate as an oxidant. The structure and doping of polyaniline were studied by FTIR, UV and Cyclic voltammetry studies. The conducting polymer is mixed with AC and prepared composites were characterized by UV, FTIR, and CV. The specific capacitance of composites calculated from charge-discharge at 0.5 mA g was found to be 99.6 Fg and for cyclic voltammetry, at the scan rate of 2 mV s, it is 77 Fg. [ABSTRACT FROM AUTHOR]