Preparation and enhanced photoelectrochemical performance of coupled bicomponent ZnO-TiO2 nanocomposites
Preparation and enhanced photoelectrochemical performance of coupled bicomponent ZnO-TiO2 nanocomposites
复制标题
耦合双组分ZnO-TiO2纳米复合材料的制备及其增强光电化学性能
DOI：
10.1021/jp077236a
复制
发表时间：
2008-01-10
影响因子：
3.7
通讯作者：
Li, Jinghong
中科院分区：
文献类型：
--
作者：
Chen, Da;Zhang, Hao;Li, Jinghong
采用一步水热法制备了由纳米TiO 2和纤锌矿型ZnO纳米棒组成的新型偶联双组分纳米复合材料，并通过透射电镜、X射线衍射和比表面积对其进行了表征。与单纯的TiO 2纳米颗粒或ZnO纳米棒相比，TiO 2纳米颗粒和ZnO纳米棒的耦合对其表面形貌、比表面积、电子性质和光电化学性质产生了显著的影响。耦合的ZnO-TiO 2纳米复合材料的产生的光电流大大增强了几个数量级更高的强度比单纯的TiO 2纳米颗粒或ZnO纳米棒。以甲基蓝为探针反应，考察了复合材料的光催化活性，结果表明，复合材料的光催化活性明显高于单纯的TiO 2纳米颗粒或ZnO纳米棒。光电流和光催化活性的增强可能是由于ZnO-TiO 2纳米复合材料中TiO 2/ZnO异质结的比表面积增加，提高了光捕获能力和活性位产生光生电子-空穴对的能力，以及良好的电子转移性能。预计目前的工作是值得注意的意义，了解独特的性能，从耦合纳米复合材料和设计新的纳米复合材料的先进功能的光电化学应用。
Novel coupled bicomponent nanocomposites consisting of anatase TiO2 nanoparticles and wurtzite ZnO nanorods were prepared using a one-step hydrothermal method, and they were characterized by transmission electron microscopy, X-ray diffraction, and specific surface area. Compared with the mere TiO2 nanoparticles or ZnO nanorods, the coupling of TiO2 nanoparticles and ZnO nanorods produced a significant effect on its properties, such as surface morphologies, surface areas, electronic properties, and photoelectrochemical properties. The generated photocurrent of the coupled ZnO-TiO2 nanocomposite was largely enhanced with several orders of magnitude higher intensities than that of the mere TiO2 nanoparticles or ZnO nanorods. The photocatalytic activities of the coupled TiO2-ZnO nanocomposites, evaluated using the photodegradation of methyl blue as a probe reaction, were also significantly enhanced compared to those of the mere TiO2 nanoparticles or ZnO nanorods. The enhancement of the photocurrent actions and photocatalytic activities might arise from the increased surface area, which can enhance the light harvest and the ability of generating photoinduced electron-hole pairs of active sites, and the favorable electron-transfer properties of the heterojunctions TiO2/ZnO in the coupled ZnO-TiO2 nanocomposites. It is expected that the present work is of notable significance for understanding the unique properties that result from the coupled nanocomposites and designing new nanocomposites of advanced functions in photoelectrochemical applications.