Effect of Rare Earth Doping on Electrochemical Properties of Fe_2O_3 Nanoparticle for Supercapacitor

摘要

Fe_2O_3 nanoparticle was prepared by a hydrothermal method, and the influence of rare earth elements (Y~(3+), Nd~(3+) and La~(3+)) on the electrochemical performance was studied. The crystal structure and microstructure of the synthesized lithium zinc ferrite were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the powder is well crystallized and the particles are mostly irregular. The electrochemical property was characterized via cyclic voltammetry (CV) and constant current charge-discharge method. The capacitance of the Fe_2O_3 nanoparticle is 258.3 F/g, 342.7 F/g after doping Y~(3+),337.1 F/g after doping Nd~(3+)and 331.2 F/g after doping La~(3+). The results show that the rare earth elements (Y~(3+), Nd~(3+) and La~(3+)) after the specific capacitance has increased, more suitable for super capacitor materials.