Synthesis and Electrochemical Performance of Porous TiO_2

A kind of nanostructure TiO_2 with large surface area was synthesized successfully by using mesoporous carbon as sacrificial template.The effects of annealing time on the morphologies and electrochemical performances of the as-prepared samples were studied.The as-prepared material was characterized by X-ray diffraction(XRD), Field emission scanning electron microscope(FESEM),High-resolution transmission electron microscope (HRTEM),Nitrogen adsorption and desorption experiments and electrochemical measurements systematically.The results show that the as-synthesized TiO_2 is composed of nanoparticles,which has a narrow porous distribution with high specific surface area.It is also found that the sample synthesized at 500℃for 2 h is pure anatase TiO_2,when the sintering time is prolonged to 12 h,there is a trace amount of rutile phase coexisted with the anatase phase. However,the sample sintered for 12 h exhibits higher initial capacity than that of the sample sintered for 2 h,which may be caused by different crystallization of samples.