A Facile Synthesis of NiFe<sub>2</sub>O<sub>4</sub> with High Specific Capacitance as Supercapacitor Electrode Material

NiFe 2 O 4 powders were synthesized by a facile hydrothermal method at 180°C followed by a thermal treatment at 300°C. The phase composition and morphology were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results showed that the NiFe 2 O 4 powders were well-crystallized, and they possessed a particle size in the range of 50-100 nm. The electrochemical property was characterized via cyclic voltammetry (CV) and constant current charge-discharge method. Encouragingly, the NiFe 2 O 4 powders had an excellent electrochemical property, whose specific capacitance reached 266.84 F/g at the electric current density of 1 A/g due to the small particle size. Compared with other Fe-based metal compound oxides, NiFe 2 O 4 has a better electrochemical performance, which can be widely used in the supercapacitor electrode materials.