氧化参数对TiO_2纳米管结构及双室光电化学池产氢性能的影响

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。

Influence of Anodization Parameters on the Structure of TiO2 Nanotubes and Hydrogen Production in a Two-compartment Photoelectrochemical Cell

A seriesSof TiO₂ nanotube array thin films were prepared by anodic oxidation pure titanium foils under different anodization voltages and anodization times in ethylene glycol electrolyte. The surface and fracture morphology of TiO₂ nanotube samples were characterized by FESEM, which was used to investigate the influence of anodization voltage and anodization time on the growth rate of TiO₂ nanotubes. Photoelectrochemical properties of the TiO₂ nanotubes were measured by electrochemical method. The photocatalytic activity of TiO₂ nanotubes was evaluated by hydrogen production in the two-compartment photoelectrochemical cell without any external applied voltage. The results indicated that comparing to prolonging anodization time, increasing anodization voltage was more effective to obtain TiO₂ nanotube arrays withShigh aspect ratio. Consequently, the photocurrent response, photoconversion efficiency and hydrogen production of TiO₂ nanotube arrays were improved remarkably.