TiO2形貌调控及其对光催化CO2还原活性的研究

作     者：Low Jingxiang 

作者单位：武汉理工大学 

学位级别：硕士

导师姓名：余家国

授予年度：2015年

学科分类：081702[工学-化学工艺] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

主      题：TiO2 CO2 reduction facets nanotube arrays photonic crystal 

摘      要：With the rapid increasing of enormous challenges in energy demands and environmental pollution ignited by fossil fuels consumption, developing of renewable and green technologies for energy production has aroused widespread concern in the past few decades. Among various proposed technologies, semiconductor-based photocatalysis for CO2 reduction have been known as one of the most perspective strategies because of its potential in renewable energy creation and environmental remedies. In details, photocatalysis CO2 reduction can transform the green-house gas(CO2) into the valuable solar fuels such as CH4, HCO2 H, CH2 O and CH3 OH. This outstanding ability of the photocatalysis CO2 reduction is the main motivation for the searching of efficient and visible-light active photocatalyst. After years of research and development, many semiconductors have been assayed and explored to be used as an effective photocatalyst for photocatalysis CO2 reduction, such as Ti O2, Cd S, g-C3N4, Zn O and Bi2WO6. However, the practical application of photocatalysis CO2 reduction is still limited by its low CO2 conversion efficiency due to the fast charge carriers recombination and low light utilization. Among these semiconductors, Ti O2 has regarded as the most promising photocatalyst because of its low cost, environmentally friendliness and excellent photostability. However, Ti O2 owns low photoconversion efficiency even in the UV-region due to its large bandgap, less photocatalytic reaction site, low electron mobility and short minority carrier diffusion length. Several strategies have been carried out to improve the photoconversion efficiency of the Ti O2, such as extending the Ti O2 absorption to visible light, boosting electron and hole lifetimes through doping and loading metals, and increasing the surface area by building a porous *** tuning is an effective way to enhance the photocatalytic activity of the photocatalyst. Nowadays, there is an enormous interest in con