Rare earth metal <scp>oxide‐doped</scp> reduced <scp>graphene‐oxide</scp> nanocomposite as binder‐free hybrid electrode material for supercapacitor application

Abstract

In this study, rare earth metal-oxide (yttrium oxide nanoparticles, Y2O3NPs) doped reduced graphene oxide nanosheets (rGONSs) nanocomposites (Y-rGO) were prepared and applied as hybrid electrode materials to evaluate the supercapacitor performances. For comparative analysis, various ratios of Y2O3NPs doped rGONSs nanocomposites were prepared by dispersing different amounts (3,5, and 10 wt%) of Y2O3NPs in the aqueous rGONSs dispersion under facile ultrasonication process. As prepared Y-rGO nanocomposites were characterized towards its physicochemical and electrochemical properties using powder X-ray diffraction, Fourier-transform infrared spectroscopy, field-emission scanning electron microscopy, X-ray photoelectron spectroscopy, and electrochemical analysis such as cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge (GCD) analysis. Electrochemical studies reveal that 5 wt% Y-rGO displays improved supercapacitor performance with a high specific capacitance of 190 Fg−1at 10 mVs−1 and also exhibits excellent cyclic retention of 88% due to the intercalation of rGO and less contact resistance facilitated by Y2O3NPs when compared with 3 wt% Y-rGO and 10 wt% Y-rGO nanocomposites. Further, 5 wt% Y-rGO display a very low charge-transfer resistance of 0.001 Ω, suggesting its commercial viability for energy storage devices.