Density functional theory study on the interaction of CO with the Fe3O4(001) surface

被引：32
作者：
Xue, Pengyan [1 ]
Fu, Zhaoming [1 ]
Chu, Xingli [1 ]
Zhang, Yanxing [1 ]
Yang, Zongxian [1 ]
机构：
[1] Henan Normal Univ, Coll Phys & Elect Engn, Xinxiang 453007, Henan, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2014年 / 317卷
基金：
中国国家自然科学基金;
关键词：
Fe3O4(001) surface; CO adsorption; CO oxidation; DFT plus U; INITIO MOLECULAR-DYNAMICS; TOTAL-ENERGY CALCULATIONS; ELECTRONIC-STRUCTURE; HYDROGEN-PRODUCTION; CARBON-MONOXIDE; ADSORPTION; MAGNETITE; GAS; DESORPTION; EXCHANGE;
D O I：
10.1016/j.apsusc.2014.09.002
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The adsorption properties of CO on the nondefective and defective (with an oxygen vacancy) B-layer Fe3O4(0 0 1) surfaces (an octahedral environment of iron ions) at different coverages are studied using the spin-polarized density functional theory with the inclusion of on-site Coulomb interaction by introducing Hubbard U parameter (DFT + U) method. It is found that the CO adsorption energy in general increases with the CO coverage. Both types of B-layer Fe3O4(0 0 1) surfaces have the excellent ability for CO oxidation. Comparatively, the defective B-layer Fe3O4(0 0 1) surface has a much stronger CO adsorption ability and a lower CO oxidation ability than the nondefective B-layer Fe3O4(0 0 1) surface. The density of state reveals the bonding mechanism of CO on the two surfaces. The effects of the ambient conditions on the CO adsorption processes are analyzed. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：752 / 759
页数：8
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