高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (12): 2624.doi: 10.7503/cjcu20140676

• 物理化学 • 上一篇    下一篇

采用第一性原理研究非金属掺杂BiOCl的电子结构和光吸收性质

王艳1,2, 张小超2(), 赵丽军2, 赵晓霞1, 史宝萍1, 樊彩梅2()   

  1. 1.太原科技大学化学与生物工程学院, 太原 030021
    2.太原理工大学化学化工学院, 太原 030024
  • 收稿日期:2014-07-21 出版日期:2014-12-10 发布日期:2014-11-29
  • 作者简介:联系人简介: 张小超, 男, 博士, 讲师, 主要从事光催化理论计算研究. E-mail:zhangxiaochao@tyut.edu.cn;樊彩梅, 女, 博士, 教授, 主要从事光催化水处理研究. E-mail:fancm@163.com
  • 基金资助:
    国家自然科学基金(批准号: 21176168)、 山西省(青年)自然科学基金(批准号: 2014021019-3)和山西省高等学校科技创新项目资助

First Principles Calculations on Electronic Structures and Optical Absorption Properties of Non-metal Doped BiOCl

WANG Yan1,2, ZHANG Xiaochao2,*(), ZHAO Lijun2, ZHAO Xiaoxia1, SHI Baoping1, FAN Caimei2,*()   

  1. 1. College of Chemistry and Bioengineering, Taiyuan University of Science and Technology, Taiyuan 030021, China
    2. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2014-07-21 Online:2014-12-10 Published:2014-11-29
  • Contact: ZHANG Xiaochao,FAN Caimei E-mail:zhangxiaochao@tyut.edu.cn;fancm@163.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21176168), the Natural Science Foundation for Young Scientists of Shanxi Province, China(No.2014021019-3) and the Science and Technology Innovation Project of Shanxi Provincial Higher Education Institutions, China

摘要:

基于密度泛函理论的第一性原理分别研究了不同浓度Br和I掺杂BiOCl体系的能带结构、 态密度、 形成能和光学性质. 研究结果表明, 由于Br的4p和I的5p轨道作用, Br和I掺杂可在一定程度上降低BiOCl的禁带宽度, 拓宽BiOCl的光吸收范围. Br和I掺杂BiOCl的形成能计算结果表明, Br掺杂BiOCl的稳定性高于I掺杂体系. 对于B, C, N, Si, P和S掺杂BiOCl体系, 掺杂能级的形成主要由掺杂元素的np轨道贡献, 使BiOCl吸收带边红移至可见光区. 而S掺杂则位于价带顶位置, 有效地降低了BiOCl禁带宽度, 使BiOCl响应波长出现红移, 且未形成中间能级, 不易成为俘获陷阱, 因此S掺杂将是一种提高BiOCl可见光光催化活性的改性方法.

关键词: 非金属掺杂, BiOCl, 第一性原理, 电子结构, 光吸收性质, 光催化

Abstract:

The band structures, density of states, formation energies and optical properties of different concentration Br and I doped BiOCl systems were investigated via first principles based on the density functional theory. The results show that the incorporation of Br 4p and I 5p orbitals can reduce the energy gap of BiOCl, and then broaden the photo-absorption range. The calculated formation energy indicates that Br-doped BiOCl system has higher stability than I-doped BiOCl at the same doping concentration. For B, C, N, Si, P, S doped BiOCl systems, the impurity energy levels are mainly contributed to the np states of doping elements, which can make the red-shift of photo-absorption band edge into visible light region. Especially, the impurity levels of S-doped BiOCl system located in the top of valence band are difficult to become recombination center of photon-generated carriers, which can result in the reduction of BiOCl band-gap and the red-shift of light-responding scope. The S-doped BiOCl system will be a preferable modification method to improve the photocatalytic activity of BiOCl.

Key words: Non-metal doping, BiOCl, First-principle, Electronic structure, Optical absorption property, Photocatalysis

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