化工进展

• 材料科学与技术 • 上一篇    下一篇

基于能带匹配理论设计CO2光催化还原催化剂的研究进展

彭辉1,吴志红2,张建林2,卢静1,吴晨啸1,李培强1,尹洪宗1   

  1. 1山东农业大学化学与材料科学学院,山东 泰安 271018;2黄河三角洲京博化工研究院,山东 滨州 256600
  • 出版日期:2014-11-05 发布日期:2014-11-01

Progress in designing CO2 photocatalyst based on energy band match theory

PENG Hui1,WU Zhihong2,ZHANG Jianlin2,LU Jing1,WU Chenxiao1,LI Peiqiang1,YIN Hongzong1   

  1. 1College of Chemistry and Material Science, Shandong Agricultural University,Tai’an 271018,Shandong,China;2Yellow River Delta Jingbo Research of Chemical Industry,Binzhou 256600,Shandong,China
  • Online:2014-11-05 Published:2014-11-01

摘要: 光催化还原CO2过程中,能带隙小的材料具备优良的可见光吸收性能,但吸收的可见光并不一定能够有效地被光催化还原作用所利用,这与催化剂能带位置有着直接关系,改变材料的能带结构对调节材料的氧化还原性能有着重要影响。本文从光催化还原CO2的基本原理出发,介绍了半导体催化剂光催化还原CO2的基本过程及催化剂价带、导带位置的决定性作用,简述了当今光催化还原CO2过程中存在的催化剂价带、导带不匹配问题,并从特定晶面生长、材料复合、形成p-n结、第一性原理等方面综述了如何利用能带匹配理论来提高光催化还原CO2效率,为光催化还原CO2的材料的选择和设计提供了理论依据。

关键词: 二氧化碳, 光化学, 还原, 能带, 半导体

Abstract: In the process of photocatalytic reduction of CO2,visible light could be absorbed perfectly by the catalyst with a narrowed band gap,but those absorbed light could not be entirely devoted to photocatalytic reduction of CO2,as photocatalytic reduction performance is directly related to energy band location and band structure changing has an important influence on redox ability. Beginning with the CO2 photocatalytic reduction basic principles,this paper is aimed to introduce the basic reduction process of CO2 by semiconductor photocatalyst,the decisive role of valence band and conduction band;to briefly discuss the existing mismatch problem of valence band and conduction band in the process of photocatalytic reduction of CO2;and also to describe how to improve the CO2 photocatalytic reduction efficiency using energy band match theory,such as crystal growth,composite materials,form “p-n junction” and the First Principles,which provides theoretical references for the selection and design of catalyst for the photocatalytic reduction of CO2.

Key words: carbon dioxide, photochemistry, reduction, energy band gap, semiconductor