A NiO/TiO2 junction electrode constructed using self-organized TiO2 nanotube arrays for highly efficient photoelectrocatalytic visible light activations

作者：Jin Guo, Wuyou Fu, Haibin Yang, Qingjiang Yu, Wenyan Zhao, Xiaoming Zhou, Yongming Sui, Juan Ding, Yangen Li, Shuli Cheng, Minghui Li · 发表于：Journal of Physics D Applied Physics · 年份：2010 · DOI：10.1088/0022-3727/43/24/245202 · 被引用次数：38 · 研究领域：TiO2 Photocatalysis and Solar Cells、Advanced Photocatalysis Techniques、Transition Metal Oxide Nanomaterials

One dimensional (1D), self-organized TiO 2 nanotube arrays are known to have excellent charge transport properties and a NiO/TiO 2 junction is efficient in separating electron–hole pairs. This paper describes the synthesis of a NiO/TiO 2 junction electrode constructed using self-organized TiO 2 nanotube arrays combining the above two properties. The self-organized TiO 2 nanotube arrays used in this study were prepared by anodizing titanium films, which resulted in closely packed n-type TiO 2 tubes with an inner pore diameter of 60–90 nm, a wall thickness of approximately 15 nm and a length of 600 nm. The NiO/TiO 2 junction was synthesized by electroless plating and annealing which resulted in TiO 2 nanotube arrays coated with a layer (about 200 nm in thickness) of NiO particles (20–40 nm). The resulting NiO/TiO 2 junction electrode enabled us to obtain an enhanced photocurrent (3.05 mA cm −2 ) as compared with a TiO 2 electrode based on TiO 2 nanotube arrays (0.92 mA cm −2 ) under AM 1.5 G (100 mw cm −2 ) at a bias of 0.65 V.