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

Hui Pan; Xiaofeng Qiu; Ilia N. Ivanov; Harry M. Meyer; Wei Wang; Wenguang Zhu; M. Parans Paranthaman; Zhenyu Zhang; Gyula Eres; Baohua Gu

doi:10.1016/j.apcatb.2009.09.016

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

Hui Pan, Xiaofeng Qiu, Ilia N. Ivanov, Harry M. Meyer, Wei Wang, Wenguang Zhu, M. Parans Paranthaman, Zhenyu Zhang, Gyula Eres, Baohua Gu

Research output: Contribution to journal › Article › peer-review

53 Scopus citations

Abstract

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 °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.

Original language	English
Pages (from-to)	90-95
Number of pages	6
Journal	Applied Catalysis B: Environmental
Volume	93
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcatb.2009.09.016
State	Published - Nov 25 2009

Funding

This work was sponsored in part by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory (ORNL) and the Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, U.S. Department of Energy (DOE). ORNL is managed by UT-Battelle LLC for DOE under contract No. DE-AC05-00OR22725. The DFT calculations were performed at Computational Center of Science (CCS) of ORNL.

Keywords

Bandgap
Brookite
Catalysis
Photoenergy
TiO
Water splitting

Access to Document

10.1016/j.apcatb.2009.09.016

Cite this

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

abstract = "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 °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.",

keywords = "Bandgap, Brookite, Catalysis, Photoenergy, TiO, Water splitting",

author = "Hui Pan and Xiaofeng Qiu and Ivanov, {Ilia N.} and Meyer, {Harry M.} and Wei Wang and Wenguang Zhu and Paranthaman, {M. Parans} and Zhenyu Zhang and Gyula Eres and Baohua Gu",

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T1 - Fabrication and characterization of brookite-rich, visible light-active TiO2 films for water splitting

AU - Pan, Hui

AU - Qiu, Xiaofeng

AU - Ivanov, Ilia N.

AU - Meyer, Harry M.

AU - Wang, Wei

AU - Zhu, Wenguang

AU - Paranthaman, M. Parans

AU - Zhang, Zhenyu

AU - Eres, Gyula

AU - Gu, Baohua

PY - 2009/11/25

Y1 - 2009/11/25

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AB - 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 °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.

KW - Bandgap

KW - Brookite

KW - Catalysis

KW - Photoenergy

KW - TiO

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