Improvement in Structural and Electrochemical Properties of VZnS@ZnO for Asymmetric Supercapacitors and Electrochemical Sensors for Glucose Detection

Abstract

Electrochemical sensors have attracted scientific interest because of their fast response, high sensitivity, low power loss and stability. Hydrothermally synthesis of porous VZnS and VZnS@ZnO nanocomposite prepared for supercapacitor electrode. This work aimed to increase the electrochemical efficiency of synthesized VZnS@ZnO nanostructures under electrochemical examination. The integrated structure of the VZnS@ZnO anode provides a significant amount of potential sites for divalent ion trapping and increases charge transfer kinetics. Consequently, the specific capacities of the VZnS and VZnS@ZnO anodes are 564.09 C g−1 and 1025.39 C g−1, respectively. VZnS@ZnO and activated carbon (AC) are components in a supercapattery device configured as VZnS@ZnO//AC. Supercapattery device retains the highest 35.94 Wh kg−1 energy density and an excellent 2512.54 W kg−1 power density. According to the charge storage method study, the VZnS@ZnO//AC supercapattery stores charge via adsorption-desorption and Faradic processes. Besides, the VZnS@ZnO//AC hybrid device is used as an electrochemical sensor for glucose detection. The device showed a high sensitivity against the glucose and detected up to a small value. This research paves the way for high-performance VZnS@ZnO electrodes and expands our understanding of charge storage and electrolytic sensors to identify glucose.