Effect of Noncovalan Attachment of Magnetic Nanoparticles on Supercapacitive Performance of Reduced Graphene Oxide Nanosheets

Magnetic nanoparticles of Fe3O4 (MNP) was noncovalently attached to reduced graphene oxide nanosheets (RGO) to produce RGO/MNP nanocomposites and characterized by XRD, SEM, TEM and VSM techniques. Electrochemical properties of prepared nanocomposite materials were characterized by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy in 1 M Na2SO4 electrolyte solution, in comparison to RGO nanosheets. Supercapacitive performance of RGO/MNP nanocomposites was also investigated. Our results demonstrated that the RGO nanosheets, RGO/MNP (1:1), RGO/MNP (1:20) nonocomposites deliver an initial specific capacitance at current density of 6 Ag-1 as 112, 105 and 69 Fg-1, respectively. After 1000 cycle the specific capacitance of these materials decreased to 63, 73 and 51 Fg-1, respectively. Consequently, RGO/MNP (1:1) nanocomposite has higher capacitive retention than other, after 1000 cycle.