چكيده به لاتين
Cobalt ferrite has many applications, including as an electrode material in supercapacitors, due to its unique properties, such as good electrical conductivity, magnetic properties, cheapness, availability, low toxicity, and electrochemical properties. In this study, CoFe2O4 magnetic nanoparticles were generated using solution combustion synthesis and hydrothermal methods. Synthesis and hydrothermal combustion synthesis methods are suitable for the production of supercapacitors due to their low cost and good morphology. Solution combustion synthesis method was prepared using metal nitrates as precursor and glycine, citric acid and urea as fuel in different fuel to oxidant ratios of 0.5, 1.5 and 1.5. CoFe2O4 nanoparticles were prepared by hydrothermal synthesis using a chloride precursor and a mixture of aqueous solvents and ethylene glycol. The parameters studied in this study are the use of three different fuels and changes in the ratio of fuel to oxidant in the combustion synthesis of CoFe2O4 nanoparticles and also the weight percentage of adding RGO in hydrothermal synthesis of 10%, 20% and 30%. , Microstructure and electrochemical properties by methods such as X-ray diffraction (XRD), electron microscopy (SEM), transmission electron microscopy (TEM), specific surface area (BET), Raman spectroscopy, cyclic voltammetry (CV) and galvanic charge discharge (GCD) was assessed. It has been shown that nanoparticles synthesized by combustion method with glycine fuel in the ratio of fuel to oxidant 1.5 have a more spongy morphology and more porosity and have the highest capacity of 718 F / g at a current density of 1 A / g. Hydrothermally synthesized nanoparticles were also dispersed onto layers of graphene oxide by adding 10% of RGO morphology from spent lumps and cobalt ferrite nanoparticles, which resulted in these nanoparticles having the highest capacity of 1820 F / g at a current density of 1 A / g. Have. Also, the results of the hybrid test for the combustion sample with glycine fuel in the ratio of fuel to oxidant 1.5 with a capacity of 12 F / g and energy density Wh Kg-1 3.4 and the hydrothermal sample with 10% reduced graphene oxide F / g 2.8 and energy density Wh Kg-1 is 2.51.
