Ni控制掺杂TiO_2薄膜的光电化学及光催化活性  

Relationship of Photo-electrochemical Behavior and Photocatalytic Activity of TiO_2 Thin Film Manipulatively Doped by Ni

作　　者：于华[1,2] 李新军[1] 郑少健[1] 徐刚[1] 

机构地区：[1]中国科学院广州能源研究所 [2]中国科学院研究生院,北京100039

出　　处：《无机化学学报》2006年第6期978-982,共5页Chinese Journal of Inorganic Chemistry

基　　金：广东省自然科学重点实验室基金项目(No.010873);广东省科技专项项目(No.2005B33301005)。

摘　　要：采用溶胶-凝胶法通过分步控制工艺制备了镍离子不同掺杂方式的TiO2薄膜。通过甲基橙的光催化降解动力学来表征其光催化活性。结果表明:镍离子非均匀掺杂在掺杂量0.5%时可以明显增强TiO2的光催化活性,而均匀掺杂提高TiO2的光催化活性较小。光电化学表征结果显示:镍离子非均匀掺杂TiO2薄膜的瞬时光电流信号较强,说明其光生载流子易于生成且分离效果较好;循环伏安曲线表明,光照时Ni非均匀掺杂的TiO2薄膜改变了体系的氧化还原电位,说明了薄膜内建电场的建立。基于半导体的P-N结原理探讨了镍离子非均匀掺杂TiO2薄膜的光催化活性机理。The thin films of TiO2 doped manipulatively by Ni were prepared by a section-controlled process of sol-gel method. The activity of thin films was characterized by photocatalytie degradation of aqueous methyl orange under UV irradiation. The results showed that the photocatalytie activity of TiO2 thin film remarkably enhanced by non-uniformly doping, whereas that of the uniformly doped improved a little. The photo-electrochemistry behaviors of the thin films were studied by electrochemical workstation. The results showed that the non-uniformly doped TiO2 thin film displayed higher photocurrent compared with that of the pure one and the uniformly doped, which demonstrated that the photogenerated electron-hole pairs were effectively separated within the nonuniformly doped TiO2 thin film. The cyclic vohammetry curves revealed the oxidation-reduction potential shift in the reaction system of the non-uniformly doped TiO2 thin film under UV irradiation, which indicated that the inner electric field formed. Based on the p-n junction theory of the semiconductor, the photocatalytic activity mechanism of the non-uniformly doped TiO2 thin films was discussed.

关 键 词：光催化 TIO2薄膜 Ni掺杂 非均匀 

分 类 号：O611.62[理学—无机化学] O614.411[理学—化学]