基于Cu_2O的光催化研究

Cu_2O-Based Photocatalysis

光催化技术可以利用太阳能将水转化为氢能以及降解环境中的有机污染物,具有成本低廉、环境友好等特点,是解决全球能源危机和当前环境污染的重要途径之一。Cu2O禁带宽度介于2.0—2.2eV之间,是一种具有可见光响应的p型氧化物半导体,在光催化领域具有良好的应用前景,逐渐成为国内外研究的热点。本文介绍了Cu2O晶体特殊的网络结构和能带结构特点以及对其进行的掺杂和复合等改性研究,概述了Cu2O及其改性材料在光解水制氢及光降解有机污染物方面的研究进展,阐明提高Cu2O光催化效率的关键是抑制光生载流子的复合和Cu2O的光腐蚀,指出基于Cu2O的光催化反应中存在的问题,并对未来的研究方向做出了展望。

Photocatalysis became one of the important ways to solve the current global energy crisis and environmental pollution in recent years.It uses solar energy to product hydrogen via water splitting and degenerate the organic pollutants,which is not only low-cost but also environmentally friendly.Cu2O is a p-type oxide semiconductor with the band gap of 2.0—2.2eV based on its size and shape.Therefore Cu2O can adsorb the visible part of the sunlight and has a potential application in the photocatalytic field.In this review,we introduce the structural characteristics of CuO,which contains three-dimensional Cu2O networks and special band structure.Then,the modification of Cu2O including doping and coupling are described.Furthermore,the researches on the water splitting and the degeneration of organic compounds using Cu2O and modified Cu2O photocatalysts are discussed.The keys which inhibit the photocatalytic efficiency of Cu2O are the recombination of the photo-excitated electrons and holes as well as the photo corrosion of Cu2O.In the end,the ideas on further research based on the problems of Cu2O as the photocatalysts are presented.