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采用阳极氧化法制备出结构规整的TiO2纳米管阵列,然后利用电化学沉积法制备出不同电沉积时间下Cu2O/TiO2纳米管阵列异质结.通过SEM和UV-vis对样品进行表征,并对样品的可见光光电转换、光解水等性质进行了测试.结果表明,Cu2O/TiO2纳米管阵列异质结体系在可见光区域有很强的吸收,TiO2与Cu2O之间形成的p-n结具有单向二级管的性质,能有效降低光生电子-空穴对的重组,提高光致电荷分离及电子-空穴对的迁移率.当电沉积时间为30 min时,Cu2O/TiO2纳米管阵列异质结(Cu2O/TiO2NTs-30)表现出最优的可见光光电响应性质.虽然与TiO2纳米管相比,Cu2O/TiO2NTs-30的开路电压减少了0.046 V,但短路电流却提高了4.5倍,最大吸收波长处光电转换效率提高了近6倍.
The structured TiO2 nanotube arrays were prepared by anodic oxidation and the Cu2O / TiO2 nanotube array heterojunction was prepared by electrochemical deposition at different electrodeposition times.The samples were characterized by SEM and UV-vis The results showed that the Cu2O / TiO2 nanotube array heterojunction system has a strong absorption in the visible region, and the pn junction formed between TiO2 and Cu2O has a unidirectional The properties of the tube can effectively reduce the recombination of photogenerated electron-hole pairs and improve the photo-charge separation and the mobility of electron-hole pairs. When the electrodepositing time is 30 min, the Cu2O / TiO2 nanotube array heterojunction (Cu2O / TiO2NTs-30) exhibited the best visible-light photo-response properties. Although the open circuit voltage of Cu2O / TiO2NTs-30 decreased by 0.046 V compared with TiO2 nanotubes, the short- Department of photoelectric conversion efficiency increased nearly 6 times.