缺陷与晶面取向在光催化过程中的耦合作用

项目名称： 缺陷与晶面取向在光催化过程中的耦合作用

项目编号： No.21473031

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 有机化学

项目作者： 刘平

作者单位： 福州大学

项目金额： 88万元

中文摘要： 光催化技术在环境与能源等领域已显示出其诱人前景，但其低的光催化效率却限制了其实际应用范围。目前，缺陷与晶面取向各自对光催化的作用研究已广泛开展，但两者对光催化的耦合作用却极少见到报道。尽管最近的研究报道和我们的预研结果均显示缺陷与晶面取向似乎存在某种耦合作用，且这种作用可进一步提高光催化活性。本申请拟采用外部引入与原位产生的方法制备同时具有缺陷与特定晶面结构的光催化材料，并利用XPS、ESR和HRTEM等多种手段，探索同时含有缺陷与确定晶面的若干光催化剂（不同缺陷、晶面类型、缺陷浓度与晶面曝露比例）对光催化降解污染物和光解水的影响，对缺陷与晶面在光催化过程中的耦合作用做较为系统和深入的研究。我们拟重点考察缺陷在特定晶面中的引入与去除过程对光催化活性和光响应方式（即光生载流子产生、迁移与作用）的影响，力争阐明缺陷与晶面取向的耦合机制及其普适性，为制备实用、高效的光催化剂提供新思路。

中文关键词： 光催化；缺陷；晶面取向；耦合作用；光解水

英文摘要： Photocatalytic technology has exhibited enticing prospect in environment and energy fields. But the low photocatalytic efficiency limits its practical application. So far, the photocatalytic role of the defect and crystal orientation has been widely researched respectively. However, their coupling effect between defect and crystal orientation for photocatalysis is rarely reported. The recent research and our preliminary research have shown that there may be some correlation between the defect and crystal orientation, which can further enhance photocatalytic activity. In this application, the photocatalytic materials with both defects and specific crystal surface are intended to be prepared by the external introduction and in situ growth methods. The as prepared materials are investigated by XPS, ESR, HRTEM and other means. The coupled effects of defects and facet orientation on pollutants degradation and water splitting are carried out, including different kind of defects, crystal facets, defect concentration and the ratio of the exposed crystal facet. A systematic and thorough research of the synergistic effects of defect and crystal orientation on the photocatalytic process is to be discussed. We will focus on the influence of defects introduced and restore on certain facet on photocatalytic activity and photoelectric property of the material. The coupling mechanism of the defects and crystal orientation and its universality are trying to be clarified, which will provide new ideas for the preparation of practical and efficient photocatalyst.

英文关键词： photocatalysis;defect;crystal orientation;synergistic effect;photocatalytic water splitting