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首页> 外文期刊>RSC Advances >Photoelectrochemical detection performance and mechanism discussion of Bi2O3 modified TiO2 nanotube arrays
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Photoelectrochemical detection performance and mechanism discussion of Bi2O3 modified TiO2 nanotube arrays

机译：Bi2O3修饰TiO2纳米管阵列的光电化学检测性能及机理探讨。

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摘要

Bi2O3 were deposited on anodized TiO2 nanotube arrays by chemical bath deposition combined with calcination. The structures, elemental compositions and morphologies of the products were investigated by X-ray diffraction, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy and high resolution transmission electron microscopy respectively. The photoelectrochemical behaviors of TiO2 and Bi2O3/TiO2 NTAs were measured by cyclic votammetry and amperometry combined with a UV LED source. Modification of Bi2O3 on TiO2 nanotube arrays was found to decrease the photocurrent in buffer solution and increase the current response to organics addition at the same time, both of which are benefit for photoelectrochemical detection of organic compounds with high sensitivities. The mechanisms of Bi2O3 modification were further studied by analyzing the whole photoelectrochemical processes, including the optical absorption, charges transfer and surface electrochemical reactions. The photoelectrochemical COD sensor based on the optimized Bi2O3/TiO2 NTAs can achieve the detection performances with sensitivity of 1.8033 mu A (mg L-1)(-1) and COD range of 0-288 mg L-1.
机译：通过化学浴沉积和煅烧将Bi 2 O 3沉积在阳极氧化的TiO 2纳米管阵列上。分别通过X射线衍射，X射线光电子能谱，场发射扫描电子显微镜和高分辨率透射电子显微镜对产物的结构，元素组成和形貌进行了研究。 TiO2和Bi2O3 / TiO2 NTA的光电化学行为是通过循环伏安法和安培法结合UV LED源进行测量的。发现在TiO2纳米管阵列上修饰Bi2O3可以减少缓冲溶液中的光电流并同时增加对添加有机物的电流响应，这两者都有助于光电化学检测具有高灵敏度的有机化合物。通过分析整个光电化学过程，包括光吸收，电荷转移和表面电化学反应，进一步研究了Bi2O3修饰的机理。基于优化的Bi2O3 / TiO2 NTA的光电化学COD传感器可实现1.8033μA（mg L-1）（-1）的灵敏度和0-288 mg L-1的COD范围的检测性能。

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