形貌可控纳米铌酸盐复合光催化剂的制备及可见光分解水制氢研究

项目名称： 形貌可控纳米铌酸盐复合光催化剂的制备及可见光分解水制氢研究

项目编号： No.21301183

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： 周超

作者单位： 中国科学院理化技术研究所

项目金额： 25万元

中文摘要： 本项目拟采用水热法制备物相和形貌可控的纳米SnNb2O6和Sn2Nb2O7可见光催化剂，通过调控合成工艺参数，优化其分解水产氢活性。其次，利用水热法合成新型纳米半导体复合型可见光催化剂M/SnNb2O6和M/Sn2Nb2O7(M=TiO2、In2O3、CdS、C3N4等)。利用半导体复合有效促进光生电子与空穴的分离，提高其光催化活性。而且，这种纳米半导体复合型光催化剂还具有大的比表面积和更多的催化反应活性位点等优点，可进一步提高其光催化分解水产氢活性。最后，采用场诱导表面光电压谱、超快光谱等原位表征手段，研究光催化剂表面态和表面能级对界面电荷转移的影响，以及光生电子-空穴对的转移机制等，更加深入理解光催化分解水制氢反应机理，建立光催化剂的结构与性能之间关系的理论模型，为研制新型高效的可见光分解水制氢光催化剂提供新思路和新途径。

中文关键词： 纳米结构；光催化；分解水；铌酸盐；可见光响应

英文摘要： In this project, visible-light-driven SnNb2O6 and Sn2Nb2O7 photocatalysts with controllable phase and morphology will be prepared by a simple hydrothermal synthesis method, and their photocatalytic hydrogen production activities can be improved by adjusting the reaction parameters systematically. Then, novel visible-light -driven M/SnNb2O6 and M/Sn2Nb2O7(M=TiO2、In2O3、CdS、C3N4) nanocomposite photocatalysts can be obtained by the simple hydrothermal synthesis method. The advantages of these semiconductor nanocomposites are as follows: first, the separation of photoinduced electrons and holes can be promoted efficiently,which can improve their photocatalytic activities; second, they have larger surface areas and more active sites, which can further improve their photocatalytic hydrogen production activities. In order to deeply understand the mechanism of photocatalytic water splitting into hydrogen, the effects of surface status and surface energy level of the photocatalysts on the interface charge transfer as well as the transfer mechanism of the photoinduced electron-hole pairs will be studied by in-situ experimental characterization techniques, such as field induced surface photovoltage spectroscopy (FISPS) and ultrafast spectroscopy(US). Base on the above research, the theoretical model of the relationship be

英文关键词： Nanostructure；Photocatalysis；Water splitting；Niobate；Visible light response