Fabrication and characterization of brookite-rich, visible light-active TiO2 films for water splitting

被引：52

作者：

Pan, Hui ^{[1
]}

Qiu, Xiaofeng ^{[2
]}

Ivanovc, Ilia N. ^{[3
]}

Meyer, Harry M. ^{[4
]}

Wang, Wei ^{[1
]}

Zhu, Wenguang ^{[5
]}

Paranthaman, M. Parans ^{[2
]}

Zhang, Zhenyu ^{[4
,5
]}

Eres, Gyula ^{[4
]}

Gu, Baohua ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA

[2] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA

[3] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

[4] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

[5] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2009年 / 93卷 / 1-2期

关键词：

Brookite; TiO2; Water splitting; Catalysis; Bandgap; Photoenergy; NANOCRYSTALLINE TIO2; TITANIUM-DIOXIDE; PHOTOCATALYTIC ACTIVITY; BAND-GAP; PHASE; PERFORMANCE; OXIDATION; INSIGHTS; SPECTRA;

D O I：

10.1016/j.apcatb.2009.09.016

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report that mild oxidation of Ti foils in air results in brookite-rich titanium oxide (TiO2) films with similar spectral response to that of dye-sensitized TiO2. X-ray powder diffraction and Raman spectroscopy show that the onset of brookite formation occurs at 500 degrees C, and the material is characterized by a strong absorption band in the visible spectral range. The first-principle calculations show that enhanced visible light absorption correlates with the presence of Ti interstitials. Photocurrent density measurements of water splitting reveal that the brookite-rich TiO2 exhibits the highest photocatalytic performance among the different forms of TiO2 produced by oxidation of Ti foils. With increasing oxidation temperature transformation to the rutile phase accompanied by declining visible range photoactivity is observed. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：90 / 95

页数：6

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