Iodine doped anatase TiO2 photocatalyst with ultra-long visible light response: correlation between geometric/electronic structures and mechanisms

Liu, G., Sun, C., Yan, X., Cheng, L., Chen, Z., Wang, X., Wang, L., Smith, S., Lu, G. and Cheng, H. (2009) Iodine doped anatase TiO2 photocatalyst with ultra-long visible light response: correlation between geometric/electronic structures and mechanisms. JOURNAL OF MATERIALS CHEMISTRY, 19 18: 2822-2829. doi:10.1039/b820816f


Author Liu, G.
Sun, C.
Yan, X.
Cheng, L.
Chen, Z.
Wang, X.
Wang, L.
Smith, S.
Lu, G.
Cheng, H.
Title Iodine doped anatase TiO2 photocatalyst with ultra-long visible light response: correlation between geometric/electronic structures and mechanisms
Journal name JOURNAL OF MATERIALS CHEMISTRY   Check publisher's open access policy
ISSN 0959-9428
Publication date 2009-03-11
Year available 2009
Sub-type Article (original research)
DOI 10.1039/b820816f
Open Access Status Not Open Access
Volume 19
Issue 18
Start page 2822
End page 2829
Total pages 8
Editor Stanier, C.
Place of publication United Kingdom
Publisher Royal Society of Chemistry
Collection year 2010
Language eng
Subject C1
090499 Chemical Engineering not elsewhere classified
850599 Renewable Energy not elsewhere classified
Abstract We report that surface iodine doped TiO2 with coexisting atomic configurations of iodine dopant, I-O-I and I-O-Ti structures, exhibits an extended absorption edge up to 800 nm. Furthermore, photocatalytic activity investigations confirm the efficient generation of important oxidative species (OH)-O-center dot radicals in photocatalysis oxidation processes beyond 600 nm. It is theoretically found that iodine atoms prefer to be doped within the surface due to the strong I-O repulsion. I-doping in the surface led to little change in its intrinsic bandgap, but the distribution and occupation of localized states of iodine strongly depend on the surface iodine configurations. The latter is responsible for the wider range visible light response exhibited in anatase TiO2 with the coexistence of I-O-I and I-O-Ti structures. The coexistence of I-O-I and I-O-Ti structures can distinctly change the surface structure due to the release of local strain energies.
Keyword TITANIUM-DIOXIDE
iodine, photocatalyst
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Thu, 03 Sep 2009, 08:13:17 EST by Mr Andrew Martlew on behalf of Aust Institute for Bioengineering & Nanotechnology