Abstract

• Carbon (C) coated on the surface of nickel ferrite (NiFe2O4) is a structure which could act as a protective layer to form a unique core-shell structure. The NiFe2O4 coated with C anode material shows improved lithium-storage performances since the carbon structure is considered to serve as a conductor of electrons and provide pathways for Li-ion diffusion to improve the electronic and ionic conductivities. Carbon electrodes achieve high capacitance, fast charge-discharge rate, and long cycle life for supercapacitors. In this study, pure and NiFe2O4 coated with C was synthesized by solvothermal method and followed by precipitation method. The optimum solvothermal temperatures were investigated by varying the temperatures including 110, 150 and 180 ºC respectively. The core-shell structure was prepared based on the optimum temperature. The structural properties of the final product were characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and the surface morphology was studied by Scanning electron microscopy (SEM).