可见光下TiO2薄膜电极的光电性能研究

Photoelectrochemical Properties of TiO2 Thin Film Electrodes under Visible Light Illumination

摘要:

通过溶胶-凝胶、阳极氧化以及热氧化方法分别制备TiO2薄膜电极，对电极在白光和可见光照射下的光电流及光电位的变化进行表征。结果表明，3种方法制备的未经修饰的TiO2薄膜电极都表现出一定的可见光光电响应，这可能是由于热处理过程中引起了较大的晶格畸变，从而导致TiO2薄膜表面形成了很多能吸收可见光的表面态。不同条件下制备的TiO2电极在可见光下的光电响应的变化规律与白光下的光电响应一致

Abstract:

A series of TiO2 thin film electrodes were prepared by a sol-gel method, an anodization method and a thermal oxidation method. The photoelectrochemical properties of these electrodes such as photocurrents and photopotentials were characterized under white light and visible light illumination. Visible-light photoelectrochemical responses were observed for all the TiO2 thin film electrodes prepared by the three methods without any modification. This may be due to many surface states with visible light absorption ability, which was caused by lattice distortion during the annealing treatment. The changes of the visible-light photoelectrochemical response of TiO2 electrodes prepared under different conditions were the same as that of the white light response.