Metallurgical Engineering Department, University of Utah , Salt Lake City, Utah 84112, USA.
ACS Appl Mater Interfaces. 2012 Nov;4(11):5883-90. doi: 10.1021/am301527g. Epub 2012 Oct 29.
Self-assembled arrays of titania nanotubes are synthesized via electrochemical anodization of Ti foils under the presence of UV-vis irradiation. Compared to control samples (anodized without light), the light-assisted anodized samples exhibit larger diameters as well as thicker nanotube walls, whereas the length of the nanotubes remains the same under otherwise similar synthesis conditions. Enhanced photoelectrochemical performance with light-assisted anodized samples under simulated AM 1.5 irradiation is observed by an increase in photocurrent density of 45-73% at 1.23 V (RHE). The enhanced photoelectrochemical performance is correlated to improved charge separation analyzed by Mott-Schottky. A mechanism on the photoeffect during anodization is presented. The morphology and improved properties obtained from the synthesis methodology may also find application in other fields such as sensing and catalysis.
通过在 Ti 箔电化学阳极氧化过程中施加 UV-vis 光照，制备了 TiO2 纳米管的自组装阵列。与对照样品（无光条件下阳极氧化）相比，光辅助阳极氧化样品的直径更大，纳米管壁更厚，而在其他类似的合成条件下，纳米管的长度保持不变。在模拟 AM 1.5 光照下，光辅助阳极氧化样品的光电化学性能增强，在 1.23 V（RHE）时光电流密度增加了 45-73%。通过 Mott-Schottky 分析，光电化学性能的增强与电荷分离的改善有关。提出了在阳极氧化过程中的光效应机制。该合成方法得到的形貌和改善的性能也可能在传感和催化等其他领域得到应用。
