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

Abstract

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.

High‐performance activated carbons for supercapacitor: Effects of porous structures, heteroatom doping, and morphology

“…[3][4][5] SCs can be classified generally into two categories: pseudo-capacitors involving rapid reversible redox reaction 6,7 and electrical double layer capacitors (EDLCs). 8 The former, which is usually based on transition metal oxide [9][10][11][12] or conductive polymer, 13,14 likely provide considerable capacitance, while the low conductivity and poor long-term cyclability limit their applications. The latter, which stores electric energy in electrical double layer, is generally based on activated carbons (ACs), which possess high surface area, porous structure, good conductivity, and excellent electrochemical stability.…”

“…The introduction of the metal oxides to the carbonaceous materials can be a good strategy to develop high‐performance electrode materials of supercapacitors by combining the advantages of both components. Muthuselvi et al 11 developed a kind of hybrid electrode materials by doping graphene oxide nanosheet with yttrium oxide nanoparticles. By adjusting the doping amount, 5 wt% Y‐rGO displays optimum comprehensive electrochemical properties, with improved capacitance, excellent stability, and reduced contact resistance.…”

Rare Earth‐Based Nanomaterials for Supercapacitors: Preparation, Structure Engineering and Application

“…Carbon materials, such as AC, CNTs, and graphene, are considered as a hybrid composition to improve other active materials due to their exclusive physical and chemical properties, especially their high conductivity and specific surface area [197,198] . Indeed, the composite of RE and carbon materials is an efficient approach to overcome the shortcomings of RE‐based nanomaterials [33,34,49,50,71,73,74,99,126,127,146,193,199–216] . For instance, compared to Sm 2 O 3 nanoparticles, Dezfuli et al.…”

Graphene oxide/Au nanoparticles: Synthesis, properties, and application: A mini‐review

“…95 A rare-earth metal oxide/rGO composite has recently been suggested for supercapacitor applications. 96 The electrical properties of GO:Au-NC can be fused with its electrochemical properties for supercapacitor applications. In some cases, GO:Au-NC is used as an anchor material with conducting polymers to enhance the supercapacitor properties.…”