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采用乙二醇电解液,在不同氧化电压、氧化时间条件下通过阳极氧化纯钛片制备了一系列TiO_2纳米管阵列薄膜。使用场发射扫描电镜(FESEM)表征TiO_2纳米管的表面、断面形貌,探讨氧化时间及氧化电压对纳米管生长速率的影响。同时通过电化学方法测试TiO_2纳米管的光电化学性能,以无外加电压下双室光电化学池中的产氢量考察其光催化活性。结果表明,相比延长氧化时间,提高氧化电压更容易获得高长/径比的TiO_2纳米管阵列,同时可显著提高TiO_2纳米管的光电流、光电转换效率及产氢量。
A series of TiO 2 nanotube array films were prepared by anodic oxidation of pure titanium tablets with ethylene glycol electrolyte under different oxidation voltage and oxidation time. The surface and cross-sectional morphology of TiO 2 nanotubes were characterized by field emission scanning electron microscopy (FESEM), and the effects of oxidation time and oxidation voltage on the growth rate of nanotubes were investigated. At the same time, the photocatalytic activity of TiO 2 nanotubes was tested by electrochemical method. The photocatalytic activity of TiO 2 nanotubes was investigated by hydrogen production in a dual-chamber photoelectrochemical cell without applied voltage. The results show that TiO 2 nanotube arrays with high length / diameter ratio are easier to obtain than those with longer oxidation time and higher oxidation voltage. Meanwhile, photocurrent, photoelectric conversion efficiency and hydrogen production of TiO 2 nanotubes can be significantly improved.