石墨烯量子点作为固相电子传递介质构建高效、准均相光敏化分解水制氢体系的研究

项目名称： 石墨烯量子点作为固相电子传递介质构建高效、准均相光敏化分解水制氢体系的研究

项目编号： No.21463001

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 有机化学

项目作者： 敏世雄

作者单位： 北方民族大学

项目金额： 50万元

中文摘要： 石墨烯量子点除具有良好的化学稳定性能、高的比表面积、良好的溶剂相容性和优异的电子受授性能之外，还具有较强的量子限域效应、较多的边界缺陷和可调的能带结构等特点，有望成为性能优异的电子传递介质和适宜的催化剂载体材料。本项目拟利用石墨烯量子点作为固相电子传递介质和产氢助催化剂载体，构建高效、准均相的光敏化分解水制氢体系。该体系能充分发挥石墨烯量子点优异的电子接受和传递性能及载体效应，促进光生电荷的分离和迁移、提高产氢助催化剂的分散性，有望实现高效光催化分解水制氢。通过研究石墨烯量子点的表面和能带结构、石墨烯量子点与光敏化剂、产氢助催化剂组合及协同作用对所构建体系产氢效率和稳定性的影响，结合体系光电性质的表征和分析，阐明和揭示石墨烯量子点在光生电子产生、分离和迁移等微观过程中的作用机理和规律，为构建基于石墨烯量子点为电子传递介质的新型高效产氢体系和太阳能转化器件提供新的思路和实验基础。

中文关键词： 光催化分解水；太阳能；可见光；光催化机理；石墨烯量子点

英文摘要： Graphene quantum dots (GQDs) not only processes excellent chemical stability, high specific surface area, good solvent compatibility, and superior electron accepting and transporting properties, but also have strong quantum confinement effect, much more boundary defects, and tunable band-gap structure, which will render it to be a excellent medium for electron transfer and proper matix for the catalyst anchoring. This project will plan to construct a high-efficent, quasi-homogeneous photosensitized solar water splitting system for hydrogen generation by using graphene quantum dots as a solid state electron transfer relay and support of a hydrogen evolution cocatalyst (HEC). This system can give full paly to the electron accepting and transporting properies of graphene quantum dots and its support effects in hydrogen evolution reaction, hence promoting the seperation and transfer of photogeneted charges and enhancing the dispersion of HEC, thus expecting to realizing a high-efficent hydrogen generation from photocatalytic water reduction. By inverstigating the influences of suface and band structure of graphene quantum dots and its conbination and synergy intereaction with photosensitzers and hydrogen evolution cocatalysts on the photocatalytic hydrogen evolution efficiency and stability, along with charactrization and analysis of photoelectrochemical properties of resulting photosensitized system, we want to clarify and reveal the mechanism and influence rules of graphene quantum dots in the microprocesses of light-excited electron production, separation, and migration, by which providing references for the development of novel high-efficient hyrogen evolution systems and solar conversion devices based on the graphene quantum dots as an effective electron transfer carrier.

英文关键词： Photocatalytic Water Splitting;Soalr Energy;Visible Light;Photocatalytic Mechanism;Graphene Quantum Dots