Synthesis of Co{sub}3O{sub}4 Microspheres by Hydrothermal-precipitation for Electrochemical Supercapacitors

摘要

Co{sub}3O{sub}4 microspheres were synthesized by hydrothermal-precipitation method using NH{sub}3·H{sub}2O, H{sub}2O{sub}2, n-butanol and polyethylene glycol as precipitator, oxidant, assistant solvent and dispersant respectively. The products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical properties of the Co{sub}3O{sub}4 electrode were performed by cyclic voltammetry (CV) and galvanostaitc charge/discharge methods. The results exhibited that the Co{sub}3O{sub}4 single electrode had excellent stability, cyclic performance and high specific capacitance in KOH electrolyte. The specific capacitance as a single electrode was up to 653.74F/g in the 6mol/L KOH solution with 0-0.4V potential at 2mA/cm{sup}2 current density. The effects of electrolyte concentrations and current densities on its capacitive performance were investigated. The Co{sub}3O{sub}4 prepared material is potential candidate for the preparation of power source devices.