Tailored TiO2-SrTiO3 Heterostructure Nanotube Arrays for Improved Photoelectrochemical Performance
Tailored TiO2-SrTiO3 Heterostructure Nanotube Arrays for Improved Photoelectrochemical Performance
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DOI：
10.1021/nn901087c
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发表时间：
2010-01-01
期刊：
影响因子：
17.1
通讯作者：
Kamat, Prashant V.
中科院分区：
文献类型：
--
作者：
Zhang, Jun;Bang, Jin Ho;Kamat, Prashant V.
采用电化学阳极氧化法在Ti基体上制备了TiO 2纳米管阵列，并在水热条件下通过控制Sir的取代将其转化为TiO 2-SrTiO 3异质结构。通过电子显微镜和X射线衍射研究了纳米管阵列电极上SrTiO 3微晶的生长。随着Sir取代度随着水热处理的持续时间的增加，观察到SrTiO 3微晶的尺寸增加。因此，随着SrTiO 3在TiO 2-SrTiO 3纳米管阵列中的分数的增加，我们观察到平带电位向更负的电位移动，从而证实了SrTiO 3在光电化学性质的改性中的影响。水热处理1 h或更短时间得到的TiO 2-SrTiO 3复合异质结构表现出最好的光电化学性能，在360 nm处的外量子效率提高了近100%。这里提出的结果提供了一种方便的方法来定制的TiO 2-SrTiO 3纳米管阵列电极的光电化学性能，并采用它们的染料或量子点敏化太阳能电池和/或光催化制氢。
TiO2 nanotube arrays formed on Ti substrate by electrochemical anodization have been converted into TiO2-SrTiO3 heterostructures by controlled substitution of Sir under hydrothermal conditions. The growth of SrTiO3 crystallites on the nanotube array electrode was probed by electron microscopy and X-ray diffraction. As the degree of Sir substitution increases with the duration of hydrothermal treatment, an increase In the size of SrTiO3 crystallites was observed. Consequently, with increasing SrTiO3 fraction in the TiO2-SrTiO3 nanotube arrays, we observed a shift in the flat band potential to more negative potentials, thus confirming the influence of SrTiO3 in the modification of the photoelectrochemical properties. The TiO2-SrTiO3 composite heterostructures obtained with 1 h or less hydrothermal treatment exhibit the best photoelectrochemical performance with nearly 100% increase in external quantum efficiency at 360 nm. The results presented here provide a convenient way to tailor the photoelectrochemical properties of TiO2-SrTiO3 nanotube array electrodes and employ them for dye- or quantum-dot-sensitized solar cells and/or photocatalytic hydrogen production.