ZnO/TiO2复合涂层电极的制备及其光电性能

以氧化铟锡导电玻璃为基材,采用电泳沉积法制备负载型ZnO/TiO2复合涂层,经450℃后续烧结处理后,采用XRD、SEM、EDX和UV-Vis DRS对ZnO/TiO2复合涂层进行表征;在pH=7.00的磷酸盐缓冲溶液中,分别测试ZnO/TiO2复合涂层电极在紫外灯和100 W白炽灯辐照下的电化学阻抗谱、Tafel极化曲线和循环伏安等电化学性质。结果表明:ZnO以200~300 nm晶粒分散于复合涂层中,质量百分比为0.74%;ZnO/TiO2复合涂层在可见光区有一定的吸收;在可见光辐照下ZnO/TiO2复合涂层电极具有较好的光电活性,并对水的分解具有较强的光电催化活性。

Photoelectric Properties and Preparation of ZnO/TiO2 Composite Coating Electrode

ZnO/TiO2 composite coating was prepared on indium-tin-oxide(ITO) conductive glass surface by electrophoretic deposition.After 450℃ subsequent sintering treatment,ZnO/TiO2 composite coating was characterized by XRD,SEM,EDX and UV-Vis DRS.And then,under ultraviolet light and visible light illumination,the photoelectric properties of ZnO/TiO2 composite coating electrode such as electrochemical impedance spectroscopy(EIS),Tafel polarization curve and cyclic voltammetry(CV) were measured on the pH=7.00 phosphate buffer system(PBS).The results show that ZnO grain size is 200~300 nm dispersed in ZnO/TiO2 composite coating and the mass percentage of ZnO is 0.74%,visible light is absorbed to some extent,electrochemical tests indicate that composite coating electrode takes on excellent photoelectrocatalytic activity for decomposition of H2O under visible light illumination.