TiO_2-CuPcTs敏化薄膜光电流及可见光光催化性能

以四磺酸酞菁铜(CuPcTs)为敏化剂,玻璃和图案化的氧化铟锡(ITO)分别作为基底,制备了敏化薄膜TiO2-CuPcTs和ITO/TiO2-CuPcTs/ITO敏化器件.以罗丹明B(RhB)的可见光光催化降解为模型反应评价敏化薄膜的光催化性能.敏化薄膜采用UV-vis和Raman技术进行表征,同时利用敏化器件的结构特性,测定其在氮气和纯水体系下的光电流.研究结果表明,TiO2-CuPcTs可以有效地将光谱响应拓宽到可见光区,一级反应速率常数为空白TiO2薄膜的3.7倍.TiO2-CuPcTs薄膜光催化降解RhB的重复性能稳定.与ITO/TiO2/ITO器件相比,敏化器件ITO/TiO2-CuPcTs/ITO具有较高的光电流信号,验证了激发态的CuPcTs能够将电子转移到TiO导带上的敏化机理.

The photocurrent and visible-light photocatalytic properties of CuPcTs sensitized TiO2 film

With Copper Phthalocyanine Tetrasulfonic acid (CuPcTs) as photosensitizer, sensitized film TiO2-CuPcTs and sensitized device ITO/TiO2-CuPcTs/ITO were prepared using glass and patterned indium tin oxide(ITO) as substrate, respectively. The photocatalytic properties of sensitized film were evaluated by photocatalytic degradation of RhB under visible light irradiation. The dye-sensitization film was characterized by ultraviolet-visible spectroscopy and Raman spectra. At the same time, the photocurrent of ITO/TiO2-CuPcTs/ITO in conditions of nitrogen and water system were monitored based on structural characteristics of sensitized device. The results showed that, TiO2-CuPcTs could effectively broaden the visible light spectrum range. The photocatalytic degradation rhodamine B rate of TiO2-CuPcTs film were 3.7-fold as blank TiO2 film and indicated good reproductivity. The ITO/TiO2-CuPcTs/ITO device exhibited larger photocurrent in conditions of nitrogen and water system, which confirmed the sensitization mechanism that the electrons can be transferred from excited CuPcTs to conduction band of TiO2.