同步辐射技术研究Au-Cu双金属空心纳米颗粒的结构和性能

项目名称： 同步辐射技术研究Au-Cu双金属空心纳米颗粒的结构和性能

项目编号： No.11505187

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 郑旭升

作者单位： 中国科学技术大学

项目金额： 22万元

中文摘要： 新型双金属空心纳米材料具有成分可控、空隙率高、比表面积大等特点，具有新奇的物理和化学性质，在催化化学领域表现出很强的应用前景。但对于双金属空心纳米材料的结构与催化性能之间的构效关系仍缺乏深入的认识。本项目拟选取Au-Cu空心纳米颗粒作为具体研究对象，通过调控化学液相合成的条件，实现对材料的形貌、尺寸和组分的精确调控，并对这些空心纳米颗粒进行CO催化活性的表征。充分利用具有元素分辨和对局域结构敏感的同步辐射XAFS技术，同时结合高分辨电镜等常规表征手段和第一性原理理论计算，研究具有不同形貌和CO催化活性的Au-Cu空心纳米颗粒的局域原子和电子结构的差异，探讨Au-Cu空心纳米颗粒的结构与其CO催化性能之间的构效关系，从原子分子水平深入揭示影响催化活性的关键因素，为设计具有优异催化性能的双金属纳米空心结构提供理论和实验指导。

中文关键词： Au-Cu双金属空心纳米颗粒；同步辐射；X射线吸收精细结构；CO催化氧化；构效关系

英文摘要： Thanks to high specific surface area and tunable morphology, bimetallic nano-materials with hollow structures have special physical and chemical properties and are attracting an increasing attention in catalysts, energy storage devices, etc. Great efforts have been made in synthesizing bimetallic hollow nano-materials with particular structures and properties. But most of all, we should understand the relationship between structure and property of bimetallic nano-materials. In this proposal, a galvanic replacement reaction will be applied to realize the controllable growth of Au-Cu nanoparticles with defined size, structure, composition and highly catalytic activity by adjusting various reaction parameters. In combination with synchrotron radiation-based XAFS techniques and other conventional tools, we will investigate the relationship between structure and property of Au-Cu hollow nanoparticles by probing the local atomic and electronic structure. This project will not only define the factors affecting the catalytic properties, but also provide experimental and theoretical guide for the controllable synthesis of bimetallic hollow nanoparticles.

英文关键词： Au-Cu bimetallic hollow nanoparticles;synchrotron radiation;XAFS;CO oxidation;structure-activity relationship