Effect of Graphene Concentration on the Electrochemical Properties of Cobalt Ferrite Nanocomposite Materials

Abstract

A two-step process was applied to synthesize the cobalt ferrite-graphene composite materials in a one-pot hydrothermal reaction process. Graphene Oxide (GO) was synthesized by a modified Hummer’s method. The synthesized composite materials were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and Fourier-transform infrared spectroscopy (FTIR). The XRD and FTIR results were in good agreement with the TGA/DTG observations. SEM and TEM disclosed the spherical shape of the nanoparticles in 4–10 nm. The optimized CoFe2O4-G (1–5 wt.%) composite materials samples were tried for their conductivity, supercapacity, and corrosion properties. The CV results demonstrated a distinctive behavior of the supercapacitor, while the modified CoFe2O4-G (5 wt.%) electrode demonstrated a strong reduction in the Rct value (~94 Ω). The highest corrosion current density valves and corrosion rates were attained in the CoFe2O4-G (5 wt.%) composite materials as 5.53 and 0.20, respectively. The high conductivity of graphene that initiated the poor corrosion rate of the CoFe2O4-graphene composite materials could be accredited to the high conductivity and reactivity.

Corrosion in Supercapacitors- An Overview

“…The poor corrosion stability of a nanocomposite cobalt ferrite/graphene was attributed to its high electronic conductivity [82,83]. Insufficient stability of many redox-active materials potentially of interest for application in supercapacitor electrodes in contact with acidic electrolyte solutions has been noticed [84].…”

Fabrication of Multifunctional (Co2+x Fe2+1-x)(Al3+yFe3+2-y)O4 Ferrite @Graphene Oxide@Titania and Its Biological Activities

“…It is reported that dosage amount of cobalt aluminium ferritegraphene oxide-titania ferrite system increased the physical and chemical structural properties [8,9]. Spinal ferrite (Co 2+ x Fe 2+ 1-x)-(Al 3+ y Fe 3+ 2-y)O4 have attracted interest to many applications, substitution of Fe 3+ ions with Al 3+ ions in +III oxidation state [10] and Fe 2+ ions with Co 2+ ions in +II oxidation state [11], the ferrite…”

Graphene nanoplatelets (GNPs): a source to bring change in the properties of Co–Ni–Gd-ferrite/GNP nanocomposites

“…These promising structural, electrical, optical, magnetic, mechanical, and thermal properties of graphene have opened new avenues for learning materials science. 5,6 Compared with other nanomaterials, so ferrites are less expensive, reliably stable, and easy to prepare. Their high permeability at radio frequencies, high Curie temperature, high electrical resistivity, low eddy current loss, ne environmental stability, and mechanical hardness make them suitable for application in many devices, such as microwave apparatus, inductors, choke coils, transformers, and electromagnetic interface (EMI) suppressors.…”