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Photo-electro-catalytic performance of highly ordered nitrogen doped TiO2 nanotubes array photoanode

机译：高度有序氮掺杂TiO2纳米管阵列光电码的光电催化性能

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Highly ordered nitrogen doped TiO2 nanotube arrays (N-TNTAs) were synthesized via a one step anodization method at 40 V for 1 hour, in the electrolyte containing ammonium fluoride (NH4F), water and triethylamine solution, followed calcination under N2 atmosphere at 450°C for 3 h. The obtained samples were characterized by means of FE-SEM image showed that the N-TNTs are in a highly ordered array, having inner diameters, wall thickness, tube length of 65 nm, 30 nm and 900 nm, respectively. The X-ray diffraction (XRD) patterns of N-TNTAs and undoped TiO2 nanotubes arrays (TNTAs) are identical consists of anatase phase, which suggests that the doping of N does not affect the crystalline structure. X-ray photoelectron spectroscopy (XPS), revealed that N atom was incorporated into the lattice of a TiO2 nanotube array film. The infrared spectra, showed a new peak at 1240 cm~(-1) may indicate the incorporation of N into the lattice of TiO2 through substituting O atoms, in the form of ~N-Ti-O～. A red shift of the absorption edge toward the visible region of N-TNTAs are observed by diffuse reflectance spectroscopy (DRS), which is corresponding to a band gap of 2.8 eV. The photo-electro-catalytic (PEC) degradation efficiency toward methylene blue solution under visible light illumination of the N-TNTAs electrode was 89%, in which the rate constant of N-TNTAs electrode was 8 times better compared to that the undoped TNTAs photo-electrode.
机译：高度有序的氮掺杂的TiO 2纳米管阵列（N-TNTAs）经一个步骤的阳极氧化方法合成在40V 1小时，在氟化物电解质含有铵（NH 4 F）N 2气氛下，水和三乙胺的溶液，接着煅烧在450℃下进行3小时。将得到的样品进行表征通过FE-SEM图像的装置表明，在N TNTS处于高度有序的阵列中，具有内径，壁厚，分别为65nm，30nm至900nm的，管的长度。的N- TNTAs和未掺杂的TiO2纳米管阵列（TNTAs）的X射线衍射（XRD）图案是相同的由锐钛矿相，这表明N的掺杂不影响结晶结构的。 X射线光电子能谱（XPS），揭示了N原子掺入的TiO 2纳米管阵列膜的晶格。的红外光谱，在1240厘米显示新的峰〜（-1）可以指示N至取代O原子掺入到TiO 2的晶格，在〜n的钛O〜的形式。朝N-TNTAs的可见区的吸收边缘的红移是由漫反射光谱法（DRS），其对应于2.8电子伏特的带隙观察。光电催化（PEC）降解朝向下的N TNTAs电极的可见光照明亚甲蓝溶液效率为89％，其中，N-TNTAs电极的速率常数为更好8倍相比，未掺杂的TNTAs照片-电极。

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