Synthesis of Fe-Co-Cu oxide nanoparticles by solution combustion synthesis and supercapacitor applications

In this study, single metal oxides iron oxide (Fe3O4), cobalt oxide (Co3O4), copper oxide (CuO), binary metal oxides cobalt ferrite (CoFe2O4), copper ferrite (CuFe2O4), copper cobaltite (CuCo2O4) and ternary metal oxide copper-cobalt ferrite (CuCoFe2O4) nanoparticles which are synthesized by solution combustion synthesis, are prepared to be used as electrodes in supercapacitor applications. Physical characterization of the obtained nanoparticles was carried out using X-ray diffractometry (XRD) and scanning electron microscope (SEM). A conductive slurry was prepared with solution combusted nanoparticles and applied as a thin layer on nickel foam. The supercapacitive behavior of the obtained electrodes was evaluated using cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS) tests. Galvanostatic charge/discharge analyzes were performed at a current density of 0.5 A/g over 3000 cycles to determine the cyclic stability of the electrodes. The electrochemical tests revealed that the CuO electrodes showed higher capacitance than other nanoparticles.