CdS化学修饰TiO_2纳米管阵列电极的传质特性分析

Mass Transfer Properties of CdS Modified TiO_2 Nanotube Arrays Electrodes

通过声电阳极氧化-化学沉积的方法制备CdS修饰的TiO_2纳米管阵列,并对其进行形貌表征及光电性能和传质特性的研究。结果表明;相对于未修饰的TiO_2纳米管列电极,CdS纳米粒子的化学修饰在增强电极对可见光吸收能力的同时,可减小电荷载流子的迁移阻力而有效提高光生电荷的分离和传递速率。在超声场中进行化学沉积,CdS纳米粒子可在TiO_2纳米管壁上均匀沉积,使得传质阻力进一步降低而获得相对最大的光电流和电荷载流子密度(9.29×10^(19)cm^(-3))。

The CdS modified TiO_2 nanotube arrays were fabricated by sonication anodic oxidation-sequential chemical bath deposition（S-CBD）approach and their mass transfer properties in photoelectrochemical reaction were studies.The results show that deposition of CdS nanoparticles significantly improved the absorption activity in visible light region.Compared to the pure TiO_2 nanotube arrays electrode,the deposited CdS nanoparticles reduced the charge carrier transfer resistance,improved the charge transfer rate and lead to the enhanced photoelectric activities. The sonication-assisted deposition approach is helpful in obtaining uniform distribution of CdS nanoparticles on the TiO_2 electrode surface,which can further facilitate the separation and transfer of photogenerated charges and exhibit a higher charge carrier density of 9.29×10～（19）cm～（-3）.