CAS OpenIR  > 中科院上海应用物理研究所2011-2019年
Surface Structural Reconstruction for Optical Response in Iodine-Modified TiO2 Photocatalyst System
Zhang, LJ; Zhou, J; Li, J; Liu, G; Lin, X; Mao, BH; Liu, RD; Zhang, S; Wang, JQ; zhangshuo@sinap.ac.cn; wangjianqiang@sinap.ac.cn
2014
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY C
ISSN1932-7447
Volume118Issue:25Pages:13726—13732
AbstractWe 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.
KeywordVisible-light Photocatalysis Generalized Gradient Approximation Total-energy Calculations Wave Basis-set Doped Tio2 Titanium-dioxide Absorption Anatase Oxide Nanoparticles
Indexed BySCI
Language英语
WOS IDWOS:000338184300046
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/14444
Collection中科院上海应用物理研究所2011-2019年
Corresponding Authorzhangshuo@sinap.ac.cn; wangjianqiang@sinap.ac.cn
Recommended Citation
GB/T 7714
Zhang, LJ,Zhou, J,Li, J,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 Zhang, LJ.,Zhou, J.,Li, J.,Liu, G.,Lin, X.,...&wangjianqiang@sinap.ac.cn.(2014).Surface Structural Reconstruction for Optical Response in Iodine-Modified TiO2 Photocatalyst System.JOURNAL OF PHYSICAL CHEMISTRY C,118(25),13726—13732.
MLA Zhang, LJ,et al."Surface Structural Reconstruction for Optical Response in Iodine-Modified TiO2 Photocatalyst System".JOURNAL OF PHYSICAL CHEMISTRY C 118.25(2014):13726—13732.
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