Abstract: Uniform dandelion-like, sisal-like and bindle-like architectures of compounds were successfully prepared in water/hexadecyltrimethyl ammonium bromide (CTAB)/hexane/n-pentanol quaternary microemulsion under hydrothermal conditions at 100 ℃, and morphologies of the three pyrolysis products at 300 ℃ were similar to those of their corresponding precursors. X-ray diffraction (XRD) and scanning electron microscopy (SEM) showed that as-synthesized Co3O4 possessed cubic spinel-type structure. The hydrothermal time played an important role in the morphologies of the materials. Electrochemical capacitance properties of the prepared Co3O4were investigated by means of cyclic voltammetry and galvanostatic charge/discharge measurements. When the hydrothermal time increased to 6 h, the obtained Co3O4 had the excellent electrochemical capacitance with the highest capacitance of 340 F·g-1.

Key words: Hydrothermal-microemulsion, Cobalt oxide, Electrochemical capacitor