Study the Electrochemical Performance of a Novel Pseudosupercapacitor Fabricated by a Quaternary Aerogel System (ZnO/TiO2/GO/SA)

Abstract

A quaternary hybrid nanocomposite was prepared from ZnO/TiO2/GO/SA with different proportions of graphene oxide (10%, 20%, and 30%) through the use of the liquid blending method. The change in the composition of the structure of the nanocomposite was diagnosed using Raman spectroscopy, X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), and field emission scanning electron microscope techniques (FESEM), and the effect of changing the proportion of graphene oxide on the electrochemical performance was studied through the use of the three-electrode system. From the results, it was found that the electrode ZnO/TiO2/GO/SA with a ratio of 30% of graphene oxide achieved the highest specific capacity of 350 F/g at a current density of 1 mA/g due to its high surface area as a result of the increased percentage of graphene oxide. Thus, it has a large number of active sites and a low internal resistance of the electrode itself. Also, this electrode achieved a high energy density value of up to 194 Wh/kg and a power density of 994 W/kg. The charging-discharging cycles of the electrode ZnO/TiO2/GO/SA with a ratio of 30% remained stable at 98% for 5000 cycles at a current density of 9 mA/g. That means this electrode is suitable for energy storage devices such as supercapacitors.