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Abstract
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Supercapacitors are electrical storage devices that can deliver a high amount of energy in a short time. Supercapacitors provide higher energy and power density than conventional capacitors batteries respectively [1]. In this work, to improve the capacitance of supercapacitor, we modified the working electrode. The first, graphene oxide (GO) was synthesized from graphite using Hummers method 2 nanoparticles were synthesized using solid state reaction. Then GO- 2nanocomposite with a weight ratio of 4:1 and 2:1were prepared by the reflux method. The phase structure of samples was studied using X-ray diffraction (XRD). The XRD patterns revealed characteristic peak 2 and GO powder. The morphologies of samples were examined with scanning electron microscopy (SEM). SEM image showed nanoparticles and nanorods 2nanostructure that these are supported on the graphene sheet. The 2 and GO- 2 (4:1 and 2:1) on SS meshes. The electrochemical properties of samples were investigated by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) in 1.0 M Na2SO4 aqueous solution. The capacitances of the electrodes were calculated from the recorded CV and GCD curves. The results exhibited the best discharge capacitance and cycle performance for a sample containing GO- 2tha 2. Moreover, this sample may provide an excellent candidate material to use in supercapacitors because of its large specific capacitance and long-term stability.
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