Surface Structural Reconstruction for Optical Response in Iodine-Modified TiO2 Photocatalyst System

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	Surface Structural Reconstruction for Optical Response in Iodine-Modified TiO2 Photocatalyst System
	L. J. Zhang; J. Zhou; J. Li; G. Liu; X. Lin; B. H. Mao; R. D. Liu; S. Zhang; J. Q. Wang
	2014
发表期刊	Journal of Physical Chemistry C
ISSN	1932-7447
卷号	118 期号:25 页码:13726-13732
摘要	We report an alternative mechanism for the optical response of an iodine-modified anatase TiO2 photocatalyst material. Unlike the general realization that the iodine atom provides impurity levels within the optical band gap, we suggest that a distorted surface structure plays a dominant role. Anatase pure TiO2 and iodine-modified TiO2 (1-TiO2) nanocrystals were synthesized by a simple solvothermal method, and I-TiO2 exhibited an extended absorption edge up to 550 nm. Employing iodine K-edge X-ray absorption fine structure (XAFS), we demonstrate that iodine is not incorporated into the nanoparticle interior but exists in the form of IO3- groups at the surface. Furthermore, this IO3- cluster adsorption largely induces a disordered structure, as revealed by Ti 2p(3/2) X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and Ti K-edge XAFS data fitting. Density functional theory calculation indicates that this distorted structure can form a midgap state, which should be responsible for its excellent optical property. This finding represents a promising route for improving the optical response of the nanophotocatalyst system via surface treatment.
部门归属	[zhang, linjuan ; zhou, jing ; lin, xiao ; liu, renduo ; wang, jian-qjang] chinese acad sci, shanghai inst appl phys, key lab interfacial phys & technol, shanghai 201204, peoples r china. [li, jiong ; zhang, shuo] chinese acad sci, shanghai inst appl phys, shanghai synchrotron radiat facil, shanghai 201204, peoples r china. [liu, gang] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [mao, baohua] soochow univ, inst funct nano & soft mat labsoratory, suzhou 215123, jiangsu, peoples r china. ; wang, jq (reprint author), chinese acad sci, shanghai inst appl phys, key lab interfacial phys & technol, shanghai 201204, peoples r china. ; zhangshuo@sinap.ac.cn ; wangjianqiang@sinap.ac.cn
关键词	Visible-light Photocatalysis Generalized Gradient Approximation Total-energy Calculations Wave Basis-set Doped Tio2 Titanium-dioxide Absorption Anatase Oxide Nanoparticles
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73496
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. J. Zhang,J. Zhou,J. Li,et al. Surface Structural Reconstruction for Optical Response in Iodine-Modified TiO2 Photocatalyst System[J]. Journal of Physical Chemistry C,2014,118(25):13726-13732.
APA	L. J. Zhang.,J. Zhou.,J. Li.,G. Liu.,X. Lin.,...&J. Q. Wang.(2014).Surface Structural Reconstruction for Optical Response in Iodine-Modified TiO2 Photocatalyst System.Journal of Physical Chemistry C,118(25),13726-13732.
MLA	L. J. Zhang,et al."Surface Structural Reconstruction for Optical Response in Iodine-Modified TiO2 Photocatalyst System".Journal of Physical Chemistry C 118.25(2014):13726-13732.