A nano-flake network cobalt hydroxide and well-ordered hexagonal mesoporous silica SBA-15 molecular sieves nanocomposite materials (designated as Co(OH)(2)/SBA-15) for electrochemical capacitor electrode have been prepared using a liquid-precipitated method. The electrochemical capacitance characterization of the Co(OH)2/SBA-15 materials was performed using cyclic voltammetry, chronopotentiometry, and impedance spectroscopy, respectively. These nano-flakes cobalt hydroxide maintain high utilization at high rates of discharge. A maximum specific capacitance of 467.5 Fg(-1) can be achieved in 2 M aqueous KOH with the potential range from -0.2 to 0.4V (vs. SCE) in a three-electrode glass cell at room temperature for the Co(OH)(2)/SBA-15 electrode, suggesting its potential application in electrochemical capacitors. Furthermore, the effect of annealing temperatures on the electrochemical capacitance characteristics has also been explored. (C) 2010 Elsevier B.V. All rights reserved.