二氧化钛纳米管阵列电极的光电化学性能研究  

Photoelectrochemical Properties of TiO_2 Nanotube Arrays Electrodes

作　　者：李贺[1] 姚素薇[1] 张卫国[1] 王宏智[1] 贲宇恒[1] 

机构地区：[1]天津大学化工学院,天津300072

出　　处：《稀有金属材料与工程》2007年第10期1749-1753,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50271046);教育部博士点基金(20030056034)

摘　　要：采用阳极氧化法在钛片上制备了垂直排列的TiO2纳米管阵列,利用SEM XRD对纳米管阵列的形貌和结构进行了表征,并通过电化学交流阻抗谱、光照开路电位谱和瞬态光电流谱技术对纳米管阵列电极的光电化学特性进行了研究。实验结果表明,TiO2纳米管的内径约为90nm,管壁约为10nm,纳米管阵列厚度约为500nm,经600℃退火处理后,转变为锐钛矿型与金红石型的混晶结构。光电测试结果表明,随着退火温度升高,TiO2纳米管阵列电极的界面电荷转移电阻减小,光电流逐渐增大,光照开路电压增大,至600℃达到最大,当退火温度继续升高,电极的光电性能急剧下降。与TiO2纳米多孔膜电极相比,光电性能显著提高,这主要归因于TiO2纳米管阵列更大的孔隙率和比表面积。TiO2 nanotube arrays were fabricated by anodic oxidation on a titanium sheet. The morphology and structure of the nanotube arrays were characterized by SEM and XRD. The photoelectrochemical properties of the nanotube arrays electrodes were evaluated by electrochemical impedance spectroscopy （EIS）, open-circuit potential and transient photocurrents. The results show that the aperture size of nanotube is about 90 nm, the wall thickness of nanotube is about 10 nm, and the length of nanotube is about 500 nm. The structure of nanotube arrays is a mixture phase of anatase and rutile annealed at 600℃. The results of photoelectric measurements show that the interracial charge transfer resistance decreases, while photocurrent increases gradually and the signal of open-circuit potential increases with increasing of annealing temperature. The photoelectrochemical performance of TiO2 nanotube electrode decreases sharply when the annealing temperature was up to 600℃. Compared to TiO2 nanoporous films, the photoelectrochemical properties of TiO2 nanotube arrays are enhanced remarkably. It is attributed to the large real surface area of the TiO2 nanotube arrays.

关 键 词：阳极氧化 TIO2纳米管 阵列 光电化学 

分 类 号：O614.411[理学—无机化学]