半导体晶体基人工光合成体系的研究

项目名称： 半导体晶体基人工光合成体系的研究

项目编号： No.21473189

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： 韩洪宪

作者单位： 中国科学院大连化学物理研究所

项目金额： 85万元

中文摘要： 本研究项目将通过晶体工程，发展新型的纳米或微米尺度的、可见光吸收的、具有不等同晶面的高结晶度的半导体晶体材料，深入研究晶面电荷分离效应；通过在不等同晶面上选择性担载能带和晶相匹配的氧化和还原双助催化剂的方法，探索构建晶体基人工光合成体系高效光催化分解水的可行性。借助于光谱研究和理论计算，深入研究晶体基人工光合成体系中光的吸收、光生电子和空穴的产生和分离、载流子的迁移和传输、水的还原和氧化反应等微观过程及其相应机制，进而为构建高效光催化分解水的晶体基人工光合成体系提供坚实的实验与理论基础。

中文关键词： 人工光合成体系；电荷分离；光催化分解水；助催化剂；半导体晶面

英文摘要： Based on crystal engineering, this project will develop some novel nano- or micro-sized semiconductor crystals with different facets, aiming at giving in-depth understanding on the observed facet charge separation. The feasibility of overall water splitting by the semiconductor crystal-based artificial photosynthesis system will be extensively explored by selective deposition of oxidation and reduction cocatalysts on the corresponding redox facets of the semiconductor crystals. And with the assistance of various kinds of modern spectroscopic studies and theoretical calculations, the fundamental micro-processes involved in the water splitting reactions will be explored, with special focus on the process of light absorption, generation and separation of electrons and holes upon photoexcitation, charge carrier mobility and transport, and water splitting reactions on the surface reactive sites. This project will give great insight into the fundamental mechanisms of water splitting reaction on the semiconductor crystal-based artificial photosynthesis systems, which may serve as a meaningful guidance for the development of more efficient overall water splitting systems.

英文关键词： artificial photosynthesis system;charge separation;photocatalytic splitting of water;cocatalyst;semiconductor crystal facets