加氢TiO2纳米线阵列的制备及其光解水制氢性能研究

项目名称： 加氢TiO2纳米线阵列的制备及其光解水制氢性能研究

项目编号： No.21303227

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 王道爱

作者单位： 中国科学院兰州化学物理研究所

项目金额： 25万元

中文摘要： 利用半导体光催化材料可以实现太阳能光解水制氢。本项目总体思路是利用模板自组装技术和氢化处理技术制备加氢TiO2有序纳米线阵列材料，通过结构调控增加有序性和比表面积，通过非金属掺杂拓宽吸光范围，提高其在光解水制氢方面的性能。首先利用钛基多孔氧化铝模板辅助的电化学阳极氧化工艺制备高度有序的TiO2纳米线阵列，之后在其纳米线表面构筑次级纳米结构，最后进行加氢处理得到氢化的TiO2光催化材料，并研究有序纳米线结构、次级纳米结构及加氢后处理对TiO2 材料的光催化制氢和光电催化制氢性能的影响。优点如下：1）以有序纳米线为骨架结构，有利于电子-空穴对的分离和传输，而次级纳米结构的构建利于增大比表面积，减小光损失；2）加氢处理可拓宽材料的吸收光谱，并能提高TiO2阵列材料的电导性；3）易掺杂和修饰改性，使其在光解水制氢性能改善方面大有可为；4）该结构有助于探索有序TiO2纳米材料中电荷转移与输运机制。

中文关键词： TiO2纳米阵列；阳极氧化；加氢；光解水；表面处理

英文摘要： Photocatalytic water splitting is a promising approach to direct conversion of solar energy into storable hydrogen fuel. In this project,the hydrogenated TiO2 nanowire array is prepared by self-assembly technologies and post hydrogenating treatment. The photocatalytic water splitting activities of the TiO2 nanowire material are improved by further increasing the surface area and alignment of the TiO2 nanomaterial with structual controlling, and also the enlargement of the absorption spectrum by nonmetal doping. First, the well aligned TiO2 nanowire array is prepared on Ti substrate by anodization method with porous anodic aluminum oxide (AAO) templates as mask. Then the secondary nanostructures are in situ grown on the surface of the TiO2 nanowires to form the multidimensional structure. last,the TiO2 photocatalyst materials are post-treated with hydrogen to further enlarge the absorption spectrum to visible region to form the hydrogenated multidimensional TiO2 nanowire array. Also, the influence of the architecture, secondary structure, and hydrogenation treatment on the photocatalytic activities of these materials will be systematic studied. There are several advantages of this strategy: 1) the well aligned nanowire structure as main skeleton structure is benefit to make the photon induced excitons effectively

英文关键词： TiO2 nanamaterial array；anodization；hydrogenation；water-splitting；surface treatment