Electrochemical and photoelectrical properties of titania nanotube arrays annealed in different gases
Electrochemical and photoelectrical properties of titania nanotube arrays annealed in different gases
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DOI：
10.1016/j.snb.2008.05.005
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发表时间：
2008-09
影响因子：
8.4
通讯作者：
P. Xiao;Dawei Liu;Betzaida Batalla Garcia;S. Sepehri;Yunhuai Zhang;G. Cao
中科院分区：
文献类型：
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作者：
P. Xiao;Dawei Liu;Betzaida Batalla Garcia;S. Sepehri;Yunhuai Zhang;G. Cao
采用钛箔阳极氧化法制备了二氧化钛纳米管阵列，并在干燥的氮气、空气和氩气中，在不同温度下焙烧不同时间。用扫描电子显微镜和X射线衍射仪研究了纳米管阵列的形貌和结晶度的变化。通过电化学阻抗谱(EIS)研究了不同的热处理条件对纳米管阵列的电化学性质和电导率的影响，结果表明，在氮气中焙烧3h的二氧化钛纳米管阵列的电导率比未经空气和氩气退火热处理的二氧化钛纳米管阵列有较大的提高。在10 mM K3[Fe(CN)6]溶液中，在0.1V/S下的循环伏安扫描中观察到清晰的氧化峰和还原峰。在氮气中焙烧的二氧化钛纳米管阵列的光电流响应显著增强。四价钛离子的还原和氧空位的形成是二氧化钛纳米管阵列电化学和光电性能改善的原因。
Titania nanotube arrays fabricated by anodic oxidation of titanium foil were calcined in dry nitrogen, air, and argon at various temperatures for varied period of time. Changes in morphology and crystallinity of the nanotube arrays were studied by means of SEM and XRD. The influences of annealing conditions on the electrochemical and conductivity were investigated by electrochemical impedance spectroscopy (EIS), and the results showed that the electrical conductivities of TiO2nanotube arrays calcined in nitrogen for 3h were improved greatly as compared to the as-grown titania nanotube arrays or annealed in air or argon. Well defined oxidation and reduction peaks were observed during the cyclic voltammetric scan at 0.1V/s in 10mM K3[Fe(CN)6] solution. Photocurrent response in TiO2nanotube arrays calcined in nitrogen was significantly enhanced. Reduction of tetravalent titanium cations and the formation of oxygen vacancies were ascribed to explain the improved electrochemical and photoelectrical properties of titania nanotube arrays.