High electrochemical performance of rGO-CNTs composites as an electrode material for supercapacitors applications

Abstract

The objective of this work was to improve the capacitive behavior of rGO-CNTs composite electrode. The prepared composite has been examined for electric double layer capacitor (EDLCs) devices. The structural and chemical properties of the composite has been validated by X-ray diffraction (XRD), Raman spectroscopy and scanning electron microscope (SEM). We performed the cyclic voltammetry (CV) and measured specific capacitance of 54 Fg−1at 10 ​mV/s for 1 ​M ​H2SO4 and 36.25 ​F ​g−1 for 1 ​M KOH liquid electrolyte. From galvanostatic charge-discharge (GCD) studies, 1 ​M H2SO4 electrolytes we obtained the energy density and power density as 10.67 ​Wh kg−1 and 2400 ​W ​kg−1 respectively at 6 A/g. However, 1 ​M KOH electrolytes has an energy density and power density of 1.7 ​Wh kg−1 and 1600 ​W ​kg−1 at 4 A/g. Therefore, the performance of 1 ​M ​H2SO4 electrolytes shows better results as compared to the 1 ​M KOH. Hence, we conclude that rGO-CNTs electrode is an interesting material for supercapacitor applications.