新型无支撑2D纳米片可见光光催化剂的制备及其界面电荷迁移机制研究

项目名称： 新型无支撑2D纳米片可见光光催化剂的制备及其界面电荷迁移机制研究

项目编号： No.21303019

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： 梁诗景

作者单位： 福州大学

项目金额： 25万元

中文摘要： 设计开发高量子效率可见光光催化剂是光催化领域的重点和难点。本项目拟开展研究分子级厚度的新型高效无支撑2D纳米片可见光光催化剂，并利用其独特的表面结构研究其光催化过程中界面电子迁移机制。根据Hansen溶解度参数理论，选择合适前驱体和溶剂，采用软化学方法自上而下或自下而上控制制备系列具有高比表面积的新型2D纳米片光催化剂。系统研究反应体系中溶剂对纳米片尺寸和厚度的影响，探明不同表面能的溶剂、不同类型插层剂与基体之间的相互作用规律。考察反应物分子在催化剂上的吸附、活化、反应等界面过程；研究纳米片的电子结构、光激发、光生载流子在界面中的迁移机制，确定影响活性的关键因素；结合量子化学计算，阐明催化剂的组成、结构与性能之间的关系，建立2D纳米片可见光光催化机理模型。最终，开发出高效新型2D纳米片可见光光催化剂，提出指导设计高效光催化剂可能的理论，为深入理解光催化的本质奠定理论和实验基础。

中文关键词： 二维纳米片；材料合成；光催化；分子水平；机制

英文摘要： Designing and developing visible light-drived photocatalysts with high quantum efficiency is essential for photocatalysis. This proposal will study on novel, free-standing and visible light-drived 2D nanosheet photocatalysts with a molecular thickness and high photocatalytic performances. The interfacial charge transfer mechanism will also be investigated using their unique surface structures. Choosing appropriate precursors and solvents, a series of novel 2D nanosheet photocatalysts with large surface areas will be controllably prepared by soft-chemical methods based on both top-down and bottom-up strategies according to the Hansen solubility parameter theory. The effects of the solvents in reaction system on the sizes and thicknesses of 2D nanosheets will be systematically studied. The interaction relationships between the solvents with different surface energies, different intercalants and the substrates will also be unravelled. Furthermore, we try to study on the adsorption, activation, reaction processes of the reactants on the surface of photocatalysts in detail. After studying on electronic structures, optical excitations and interfacial charge mobilities, we can understand the key factors of raising the quantum efficiency of 2D nanosheet photocatalysts. Thus, the internal relationships between the compon

英文关键词： 2D nanosheet；Preparation of Materials；Photocatalysis；Molecular level；Mechanism