摘要
采用溶胶凝胶模板结合煅烧的方法,合成得到磷酸钛介孔材料,研究了煅烧温度对磷酸钛介孔材料的介孔结构及其电化学性能的影响;分别采用了X-射线粉末晶体衍射技术(XRD)、低温N2吸脱附技术、高分辨透射电子显微技术(HRTEM)及元素分析等方法对样品进行了表征。实验结果表明,高温煅烧对材料的介孔结构不利,并使材料晶体化;充放电测试结果表明,在500℃下煅烧得到的材料表现出较好的电化学性能,在150mA/g下充放电,材料首次放电容量高达94mAh/g,而650℃时的材料只有64mAh/g。
Titanium phosphate mesoporous materials were prepared by use of the sol-gel template method combined with the calcination method. We studied on calcination temperature which has an influence on mesoporous structure and electrochemical performance of the titanium phosphate mesoporous materials. The samples were characterized by large and small angle X-ray diffraction methods, N2 adsorption/desorption technique, high resolution transmission electron microscope（HRTEM） and element analysis instrument. It was shown that too high temperature was bad for the mesoporous materials. Titanium phosphate mesoporous materials showed a better electrochemical performance at 500℃, the first discharge capacity of 94mAh/g under the current density of 150mA/g. And on the other hand, titanium phosphate mesoporous materials at 650℃ with a low capacity of 64mAh/g at the same charge-discharge condition.
出处
《湖南科技学院学报》
2009年第8期72-76,共5页
Journal of Hunan University of Science and Engineering
基金
湖南省重点学科建设资助项目(2006-165)
关键词
温度
磷酸钛
介孔材料
电化学性能
Temperature
Titanium phosphate： Mesoporous material
Electrochemical performance
