Evaluation and comparison of zinc oxide and zinc sulphide nanoparticles derived from Sol-Gel method for supercapacitance performance

Abstract

Zinc oxide and zinc sulphide nanoparticles were produced using the sol-gel method. We employed nanoparticle identification methods for the examination of several factors. The precursor solutions are converted into an intermediate state that mimics gel during the sol-gel process, and then solidified. This technique provides fine control over the size, shape, and crystallinity of the resultant ZnO nanoparticles, hence modifying their electrochemical behaviour in the context of supercapacitor applications. An X-ray diffraction (XRD) examination revealed that the synthesized ZnO nanoparticles had a hexagonal character, while the ZnS nanoparticles had a cubic nature with diameters of around 22 nm and 36 nm, respectively. A transmission electron microscope (TEM) and a scanning electron microscope (SEM) are used to study the morphology and structural analysis. A particle size, surface area, production methods and testing settings are only a few of the variables that affect certain capacitances. In general, ZnO is recognized for displaying a certain capacitance that is frequently cited as being higher than ZnS. At a scan rate of 5 mV, the specific capacity of ZnO nanoparticles was found to be 33.2 F/g, whereas that of ZnS nanoparticles was found to be 6.5 F/g at a scan rate of 10 mV. One way to monitor pseudo capacitive behavior is by cyclic voltammetry.