氧化亚铜表面金属纳米晶的选择性生长及其对催化性能的影响

项目名称： 氧化亚铜表面金属纳米晶的选择性生长及其对催化性能的影响

项目编号： No.51501140

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 孔春才

作者单位： 西安交通大学

项目金额： 21万元

中文摘要： 金属Cu纳米颗粒与Cu2O半导体复合可增加催化剂对可见光的吸收，提高光生电荷的分离和传输效率，使其展现出优异的催化、传感特性。然而，目前Cu2O表面纳米Cu晶粒的选择性原位生长机制尚不清楚。因此，本项目拟采用实验研究和理论模拟相结合的方式，系统地研究纳米Cu颗粒在Cu2O多面体不同晶面的生长动力学过程，揭示纳米Cu晶粒的选择性原位成核、生长机制；总结纳米Cu晶粒在Cu2O晶粒表面的分布状态对Cu-Cu2O异质结构可见光催化降解有机染料分子和CO催化氧化活性等催化特性的影响规律；建立数理模型，分析Cu-Cu2O异质结构中的电荷转移过程，以及催化反应的机理和动力学。研究结果将为研制高效廉价的Cu-Cu2O催化材料提供理论依据和实验参考。

中文关键词： 纳米铜；氧化亚铜；异质结构；催化性能

英文摘要： The composite between Copper (Cu) nanoparticles and cuprous oxide (Cu2O) can enhance the absorption of visible light, and improve the separation and mobility of photoexcited charges, finally leading to excellent photocatalysis and sensors properties. However, the in-situ growth mechanism of Cu nanopartices on different surfaces of Cu2O polyhedron is still unclear. In this project, based on the combination of experimental and theoretical analyses, we are designed to systematically study the dynamic processes of selective growth, and illustrate the nucleation and growth mechanism of Cu nanopartices on different surfaces of Cu2O polyhedron. By testing the photocatalytic degradation of dye and CO catalytic oxidation, we would understand the relationship between the distribution of Cu nanopartices in Cu-Cu2O heterojunction and catalytic performances. Finally， according to the aforementioned results, the transfer of charges in Cu-Cu2O heterojunction, and also the reaction mechanism and kinetics will be studied through mathematical and physical models. This project would provide theoretical guidance and experimental evidences for the preparation of Cu-Cu2O heterojunction catalysts with high activity as well as low cost.

英文关键词： nano-copper;cuprous oxide ;heterojunction;catalytic performances