TiO2与ZnO复合纳米结构电极的光电化学研究

利用尿素加压共沉淀法以Ti(SO4)2与Zn(NO3)2为原料制备了TiO2-ZnO复合纳米粒子, 其纳米结构电极的光电化学研究结果表明, 反应物摩尔比为3∶1, 于530 ℃煅烧制备的复合纳米结构电极的光电转换效率最高. 对吸附染料RuL2(SCN)2∶2TBA的纳米结构TiO2和各种复合纳米粒子的纳米结构电极进行光电研究的结果表明, 染料对各纳米结构电极都起到了敏化作用, 其中也是由反应物摩尔比为3∶1, 于530 ℃煅烧制备的纳米结构电极的光电转换效率最高. 对聚3-甲基噻吩修饰的纳米结构TiO2和摩尔比为3∶1, 于530 ℃煅烧的复合纳米粒子构成的纳米结构电极进行光电性能研究, 结果表明, 聚3-甲基噻吩与半导体纳米粒子之间存在p-n结, 在一定条件下p-n结的存在有利于光生电子/空穴的分离, 从而提高了光电转化效率.

Photoelectrochemical Studies on TiO2-ZnO Composite Nanostructure Electrodes

The nanostructure electrodes were prepared with composite TiO2-ZnO nanoparticles via the method of homogeneous precipitating by using Ti(SO4)2 and Zn(NO3)2. The photoelectrochemical performance of the nanostructure electrodes were studied. The experiment results show that the highest IPCE was obtained with the composite TiO2-ZnO nanoparticles prepared at nTi(SO4)2]∶nZn(NO3)2]=3∶1 and calcining temperature 530 ℃. The photoelectrochemical performances of the ITO/TiO2/RuL2(SCN)2∶2TBA and ITO/TiO2+ ZnO/RuL2(SCN)2∶2TBA electrodes were investigated. The highest IPCE was also obtained with the composite TiO2-ZnO nanoparticles prepared at nTi(SO4)2]∶nZn(NO3)2]=3∶1 and calcining temperature 530 ℃. ITO/TiO2/Poly(3-methythiophene)(PMeT) and ITO/TiO2+ZnO/PMeT were also studied. The p-n heterojunction existed in ITO/TiO2/PMeT and ITO/TiO2+ZnO/PMeT, which favored the separation of electron-hole pairs. The ITO/TiO2+ZnO/PMeT electrode obviously increased the photo-current conversion efficiency by ten times comparing with that of the ITO/TiO2/PMeT electrode.