Chemically synthesized graphene oxide nanosheet (GONs) is an efficient electrode material for supercapacitor: Effects of current collectors

Abstract

Herein, the graphene oxide nanosheets (GONs) with a low degree of agglomeration in the single and multi-layered structure manufactured by the modified Hummer's route. The fundamental, and morphological properties of GONs have been undertaken using X-ray Diffraction (XRD), and scanning electron microscopy (SEM) techniques respectively. The availability of functional groups and stretching-bending vibration in graphite and GONs materials have been investigated using the Fourier transform infrared spectroscopy (FT-IR) and Raman investigation study. Transmissionn electron microscopy (TEM) offers a more in-depth morphological and structural investigation of GONs material. The supercapacitive characteristics such as cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) of GONs-based electrodes were studied in 1 M KOH electrolyte. In addition, the synthetic graphene oxide‑nickel foam (GO-NF) electrode demonstrated excellent capacitance of (302 F/g at 5 mV/s) with power handling capabilities, having specific energy and power up to 33 Wh/kg and 1250 W/kg at 5 mA/cm2 respectively. The cyclic stability of GO-NF electrodes demonstrated long-term electrochemical capacitive retention of 90 % over the 5000 CV cycles. The liquid-state symmetric (GO-NF//GO-NF) device displays a specific capacitance of 224 and 119 F/g with Ed of 32 Wh/kg and Pd of 1100 W/kg at a scan rate of 5 mV/s and a current density of 4 mA/cm2 respectively. These outcomes show the GO-NF's superior electrochemical activity which has a beneficial impact as a potential material for energy-storage technologies.