Synthesis and electrochemical performance of CoWO4 and CoWO4/MWCNT nanocomposites for highly efficient supercapacitor applications

Abstract

Electrochemical supercapacitor is valid and as an innovative type of energy storage device in the recent years. In this study, we successfully produced the CoWO4 nanoparticles and CoWO4/MWCNT nanocomposites using a straightforward hydrothermal method and an annealing procedure. The created nanocomposites are evaluated using high-resolution field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). Additionally, the electrical conductivity is determined using electrochemical impedance spectroscopy (EIS) further, the specific capacitance is determined using cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) techniques. Higher electrochemical behavior is exhibited by the CoWO4/MWCNT composite electrode, delivers the capacitance of 543 F/g at 5 mV/ s. The CoWO4/MWCNT composite electrode demonstrates the exceptional 93 % cycle stability and 98 % coloumbic efficiency, showing better ion storage behavior in their huge electroactive areas. A possible source of electrode materials for supercapacitor applications has been found in this CoWO4/MWCNT composite due to its charge-storing capabilities.