First-principles study on anatase TiO2 (101) surface adsorption of NO

doi:10.1088/1674-1056/23/4/043101

Abstract

In this paper, the stable structure and the electronic and optical properties of nitric oxide (NO) adsorption on the anatase TiO₂ (101) surface are studied using the plane-wave ultrasoft pseudopotential method, which is based on the density functional theory. NO adsorption on the surface is weak when the outermost layer terminates on twofold coordinated oxygen atoms, but it is remarkably enhanced on the surface containing O vacancy defects. The higher the concentration of oxygen vacancy defects, the stronger the adsorption is. The adsorption energies are 3.4528 eV (N end adsorption), 2.6770 eV (O end adsorption), and 4.1437 eV (horizontal adsorption). The adsorption process is exothermic, resulting in a more stable adsorption structure. Furthermore, O vacancy defects on the TiO₂ (101) surface significantly contribute to the absorption of visible light in a relatively low-energy region. A new absorption peak in the low-energy region, corresponding to an energy of 0.9 eV, is observed. However, the TiO₂ (101) surface structure exhibits weak absorption in the low-energy region of visible light after NO adsorption.

Keywords: anatase TiO₂ (101) surface first-principles density functional theory electronic structures

Received: 03 July 2013
Revised: 26 August 2013
Accepted manuscript online:

PACS:	31.15.A-	(Ab initio calculations)
	71.15.Dx	(Computational methodology (Brillouin zone sampling, iterative diagonalization, pseudopotential construction))
	71.15.Mb	(Density functional theory, local density approximation, gradient and other corrections)
	71.15.-m	(Methods of electronic structure calculations)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 61106129 and 61274128).

Corresponding Authors: Feng Qing
E-mail: fengq_126@163.com

About author: 31.15.A-; 71.15.Dx; 71.15.Mb; 71.15.-m

Cite this article:

Feng Qing (冯庆), Yue Yuan-Xia (岳远霞), Wang Wei-Hua (王渭华), Zhu Hong-Qiang (朱洪强) First-principles study on anatase TiO₂ (101) surface adsorption of NO 2014 Chin. Phys. B 23 043101

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First-principles study on anatase TiO₂ (101) surface adsorption of NO