Effect of Ethanol on Synthesis and Electrochemical Property of Mesoporous Al-doped Titanium Dioxide via Solid-state Reaction

Mesoporous aluminum-doped titanium dioxide（Al-TiO2） materials with high specific surface areas were prepared via a solid-state reaction route.The properties of these materials were characterized by X-ray diffraction（XRD）,high resolution transmission electron microscopy（HRTEM）,energy dispersive spectroscopy（EDS）,N2 absorption-desorption,ultraviolet visible light spectroscopy（UV-Vis） and electrochemical spectroscopy.The results show that the mesoporous structure of the product with ethanol is composed of anatase laced crystal walls with amorphous grain boundaries formed gradually by degradation.Compared with those without ethanol,these samples possess larger crystallite size since ethanol decreases the pore size at higher temperature.With the increase of ethanol amount,however,the crystallite size will grow.The amorphous grain boundaries in the mesoporous material,with a large impedance and low incidental cyclic potential,are difficult to effectively degrade and the phase transformation temperature is changed from 500 to 550℃.The growth rate of Al-TiO2 crystallites that obeys the quadratic polynomial equation may be controlled.