Fabrication of composite electrode based on graphene / iron / copper for use in electrical energy storage devices

In this paper, Graphene was exfoliated and doped simultaneously with magnetic metals and their oxide derivatives based on electrochemical method. The electrochemical properties of the as-prepared samples are investigated as advanced electrode materials for supercapacitors which was coated on nickel foam substrate. The structure and composition of the synthesized samples were studied by X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS) and Raman spectroscopy. The morphologies were characterized by field emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM) and High-resolution transmission electron microscopy (HRTEM). Cyclic voltammetry and galvanostatic charge-discharge measurments have shown that the behavior of the synthesized material is battery-like. According to the results of the specific capacity at different scan rates of 5, 10, 20, 30, 40, 50 and 70 mV/s in 1 M KOH, the highest capacity related to the scan rate of 5 mV/s, which has a capacity equal to 1124.63 F/g.