高效ⅤB /ⅡB族复合光催化剂分级结构的构筑及光生载流子传输机制

项目名称： 高效ⅤB /ⅡB族复合光催化剂分级结构的构筑及光生载流子传输机制

项目编号： No.21271055

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 陈刚

作者单位： 哈尔滨工业大学

项目金额： 82万元

中文摘要： 本项目采用熔盐、高压静电纺丝法结合多元醇（酸）辅助溶剂热、表面敏化等技术构筑ⅤB族氧化物/ⅡB族硫化物复合光催化剂分级结构。研究不同构型及形貌复合光催化剂分级结构的制备规律，同时利用理论与实验相结合的方法研究催化剂的光生载流子传输机制。采用SEM、TEM、EELS等研究催化剂的生长机制及组分信息；利用XPS、Rietveld及DFT计算等方法研究催化剂的晶体及电子结构，并建立催化剂的结构-形貌关系模型；利用Mott-Schottky、UV-vis及超快光谱等研究催化剂在光诱导下的载流子输运行为，从本质上揭示该类复合分级结构光催化剂光生电荷的分离与传输机制。为高性能可见光分解水催化剂的设计和合成提供理论依据。

中文关键词： 分级结构；复合光催化剂；可见光响应；光生载流子传输机制；DFT计算

英文摘要： A variety of synthesis techniques (such as poly-alcohol/acid assisted solvothermal, molten salt, electrospinning, gaseous penetration of rare earth and ionic sensitizing) are used to construct hierarchical architectures of VB oxides/IIB sulfides composite photocatalysts. The synthesis routes of composite photocatalysts with various architecture and transport mechanism of photogenerated carriers in composite photocatalysts are conducted based on the related theories and experimental results. SEM, TEM and EElS are used to research on the growth mechanism and component information. Crystal structure and electronic structure are studied based on XPS, Rietveld refinement and DFT calculation. Furthermore, the structure-morphology model of the composite photocatalysts is also set up. Mott-Schottky curve, UV-vis spectra and ultrafast spectroscopy are utilized to research the transportation of photogenerated carriers. Our work will provide the theoretical and experimental evidence for designing and synthesizing high performance photocatalysts for water splitting, and reveal the separation and transportation of photogenerated charges in hierarchical architectures of VB oxides/IIB sulfides composite photocatalysts.

英文关键词： Hierarchical structure；Composite photocatalyst；Visible-light response；Photoinduced carrier transport mechanism；DFT calculation