FACILE SYNTHESIS OF HOLLOW Co3O4 MICROSPHERES BY SOLUTION SPRAY-OXIDATION METHOD AND ITS PROPERTIES AS SUPERCAPACITORS

The hollow Co3O4 microspheres were synthesized by solution spray-oxidation method. The feed solution was prepared by using CoCl2 center dot 6H(2)O as raw materials, sprayed by using inner mixed air-nozzle and roasted in the erective tubular resistance furnace with compressed oxygen as carrier gas. The as-prepared samples were characterized by FT-IR, XRD and SEM techniques. The results show that the reaction temperature has an important impact on micro-structure and purity during the process of spray and oxidization for cobalt chloride solution, and the hollow Co3O4 microspheres were obtained at 700 degrees C. Furthermore, the electrochemical tests show that the electrode prepared by the samples exhibits distinct characteristic of capacitance, the electrochemical capacitive properties of the hollow Co3O4 microspheres were evaluated using cyclic voltammetry and AC impedance methods. The capacitive properties depict that the Co3O4 synthesized by spray-oxidation method is capable of exhibiting excellent capacitive performance in 3.0 mol L-1 KOH electrolytes.