High electrochemical performance of rGO-CNTs composites as an electrode material for supercapacitors applications
Mohd Sadiq, M. Ajmal Khan, Mohd Sarvar, Mohammad Moeen Hasan Raza, Shah Masheerul Aalam, M. Zulfequar, Javid Ali
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.