表面修饰SrTiO3光催化剂纳米碳管的光电化学嵌锂特性

采用直接水解沉淀的方法制备了钙钛矿型SrTiO3纳米粒子,并将其修饰在纳米碳管表面形成SrTiO3/CNTs纳米复合材料,研究了SrTiO3/CNTs电极在氙灯照射下的光电化学嵌锂特性．实验结果表明,光照射对CNTs电极的嵌锂容量影响不大,而SrTiO3/CNTs电极受光照时的嵌锂容最高达251 mAh/g,远高于无光照下的嵌锂容量(170 mAh/g)．循环伏安测试也表明光照射可显著提高嵌脱锂反应电流．这可归因于SrTiO3光催化剂受光照射而诱发的纳米碳管嵌锂反应．

Photo-electrochemical Lithium Insertion Characteristics of Carbon Nanotubes Modified with SrTiO3 Photocatalyst

Perovskite-type SrTiO3 nanoparticles were synthesized by direct hydrolysis-precipitation method and were employed to modify the surface of the carbon nanotubes to form a SrTiO3/CNTs composite. The photo-electrochemical lithium insertion characteristics of the SrTiO3/CNTs composite under xenon light irradiation were investigated. The results show that the light irradiation has little influence on the specific capacity of the CNTs electrode. However, for the SrTiO3/CNTs electrode irradiated by light, the lithium insertion capacity reaches about 251 mAh/g, much higher than that without light irradiation (170 mAh/g). Cyclic voltammetry test reveals that the light irradiation can remarkably increase the reaction currents of lithium insertion and extraction. This may be attributed to the photo-excited intercalation of Li-ions into the CNTs by the SrTiO3 photocatalyst when irradiated by light.