Dielectric Properties and Electrochemical behavior of Graphene Oxide derived from Myanmar Coal Minerals

Abstract

Graphene Oxide (GO) metal nanocomposites make up an emerging class of advanced materials and enhance material functionality to obtain multifunctional properties and working towards superior performance of energy storage devices. GO was derived from Myanmar coal minerals using Modified Hummer method. The silver and nickel nanoparticles were used as metal ions or metal nanoparticles to form GO nanocomposites. Their characteristics were identified by XRD, SEM and Raman Spectroscopy. The energy gap of GO and GO composites was also investigated by the aid of UV-Vis spectroscopy. The dielectric constant is measures of the amount of electrical energy that can be stored in GO derived from coal mineral. The frequency-dependent dielectric properties and AC conductivity has been explored using GW INSTEK LCR-8110 meter. It was found that the dielectric constant is maximum at low frequencies region and decreases with increasing frequency. The electrochemical performance of this sample was examined by cyclic voltammetry (CV) measurement. The CV curves of GO have typical rectangular-like shape and no evident oxidation/reduction peak. The prototypes of flat-shaped capacitors were prepared and their capacitive values were also determined. The as-prepared GO on the copper foil can be directly used to fabricate solid-state super capacitor.