|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
|Source Publication||Journal of Physical Chemistry C
|Abstract||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.|
; 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.
Generalized Gradient Approximation
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.
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.
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.
|Files in This Item:||
||There are no files associated with this item.
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.