基于晶面效应和异质结效应协同作用的新型半导体光催化剂的理性构建与性能研究

项目名称： 基于晶面效应和异质结效应协同作用的新型半导体光催化剂的理性构建与性能研究

项目编号： No.21473146

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 匡勤

作者单位： 厦门大学

项目金额： 40万元

中文摘要： 如何合理构建高效、稳定的半导体光催化剂体系是光催化应用的核心问题，而这一问题的解决依赖于我们对半导体光催化过程中本质问题的深入理解。传统的光催化研究主要集中在材料的开发和改性两个方面，忽略了光催化剂自身的表面结构对于其性能的影响。本项目拟在TiO2和BiVO4半导体光催化剂纳米晶体裸露晶面可控合成的基础上，系统地研究光催化过程中半导体光催化剂的晶面效应；根据光催化剂各晶面在光化学过程中所起的实际功能，在特定的晶面上选择性负载相应功能的助催化剂，以此方式将晶面效应与异质结效应有机的结合，通过它们的协同作用达到增强光生电子和空穴分离以及调整导带或价带位置的目的，最终构建出高效、稳定的光催化剂体系。我们希望上述研究结果，能为今后制备高效、稳定的新型半导体光催化剂提供一些指导，使我们能够摆脱过去"炒菜式"的合成方法。

中文关键词： 半导体；光催化；表面结构；异质结；协同作用

英文摘要： Photocatalysis has long been considered as a cost-effective strategy to address the growing environmental crisis and energy shortage issues. How to rationally construct high-performance semiconductor photocatalysts is the key for photocatalysis. In the past decades, most researches regarding photocatalysis focus on exploring new photocatalytic materials and modifying them by means of introducing foreign dopants, co-catalysts, or organic sensitizers. By contrast, the essential influence from the surface structure of photocatalysts is often ignored. In theory, the photocatalytic activity of semiconductor nanocrystals is closely associated with their surface structures, especially the exposed facets, since the photocatalysis process occurs on the semiconductor surface. To the best of our knowledge, such facet-dependent photocatalytic activity of semiconductor nanocrystals has been scattered in many studies and thus systematic research on every semiconductor photocatalyst remian highly desirable to make clear facet-related mechanism. In this project, we will strive to prepare uniform a series of semiconductor nanocrystals with exposed well-defined facets by justing both thermodynamic and kinetic parameters in the crystal growth process. On this basis, we systematically investigate photocatalytic performance of semi

英文关键词： semiconductor；photocatalysis；surface structure；heterojunction；synergistic effect