Preparation of Mesoporous Co3O4 Nanoparticles via Solid-Liquid Route and Effects of Calcination Temperature and Textural Parameters on Their Electrochemical Capacitive Behaviors

Mesoporous Co3O4 nanoparticles with different textural parameters were prepared by using mesoporous silicas, KIT-6 and SBA-15, as templates and Co(NO3)(2)center dot 6H(2)O as precursor via an improved solid-liquid route. The results of N-2 adsorption-desorption analysis indicated that the calcination temperature did not obviously affect the textural parameters of Co3O4 samples and the BET surface areas Of Co3O4 samples could be regulated by different KIT-6 templates. The effects of calcination temperature and textural parameters on the electrochemical capacitive behaviors Of Co3O4 samples were discussed. The results of electrochemical tests show the following: the capacitance value of the sample decreases slightly with the increase of the calcination temperature; the BET surface area is the crucial factor for the specific capacitance value; for mesoporous materials, large pore size and high ordering degree of mesopore facilitate ion transfer; and the meso-structure (2D hexagonal structure or 3D Ia3d cubic structure) of mesoporous Co3O4 nanoparticles does not obviously affect the specific capacitance value of the samples, but 2D hexagonal mesoporous structure is more advantageous to ion transfer than 3D Ia3d cubic mesoporous structure.