Controllable synthesis of well-ordered TiO2 nanotubes in a mixed organic electrolyte for high-efficiency photocatalysis |
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| Authors: | Chao Wang Da Chen GuangXing Ping Shu Liu XiaNi Huang YueXiang Huang KangYing Shu JingHong Li |
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| Institution: | 1. College of Materials Science & Engineering, China Jiliang University, Hangzhou, 310018, China
2. Beijing Key Laboratory for Microanalytical Methods and Instrumentation; Department of Chemistry, Tsinghua University, Beijing, 100084, China
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| Abstract: | Well-ordered TiO2 nanotube arrays (TNAs) were fabricated by electrochemical anodization in a mixed organic electrolyte consisting of ethylene glycol and glycerol. The morphology, structure, crystalline phase, and photocatalytic properties of TNAs were characterized by using TEM, SEM, XRD and photodegradation of methylene blue. It was found that the morphology and structure of TNAs could be significantly influenced by the anodization time and applied voltage. The obtained tube length was found to be proportional to anodization time, and the calculated growth rate of nanotubes was 0.6 ??m/h. The microstructure analysis demonstrated that the diameter and thickness of the nanotubes increased with the increase of anodization voltage. The growth mechanism of TNAs was also proposed according to the observed relationship between current density and time during anodization. As expected, the obtained TNAs showed a higher photocatalytic activity than the commercial TiO2 P25 nanoparticles. |
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