In this study, rare earth metal-oxide (yttrium oxide nanoparticles, Y 2 O 3 NPs) 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 Y 2 O 3 NPs doped rGONSs nanocomposites were prepared by dispersing different amounts (3,5, and 10 wt%) of Y 2 O 3 NPs 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 −1 at 10 mVs −1 and also exhibits excellent cyclic retention of 88% due to the intercalation of rGO and less contact resistance facilitated by Y 2 O 3 NPs 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.

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