Probing reaction mechanisms in mixed phase TiO2 by EPR

D. C. Hurum; A. G. Agrios; S. E. Crist; K. A. Gray; T. Rajh; M. C. Thurnauer

doi:10.1016/j.elspec.2005.01.294

Probing reaction mechanisms in mixed phase TiO₂ by EPR

D. C. Hurum, A. G. Agrios, S. E. Crist, K. A. Gray, T. Rajh, M. C. Thurnauer

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

246 Scopus citations

Abstract

Charge separation processes in mixed phase TiO₂ photocatalysts are investigated by electron paramagnetic resonance (EPR) spectroscopy. The mechanisms of interfacial electron transfer, subsequent charge migration and recombination at surface sites, and other interfacial effects on chlorophenol/TiO₂ chemistry have been probed. Distorted interfacial sites have been observed and are proposed as catalytically reactive hot spots. This detailed knowledge of charge transfer processes is critical to the nanoscale design of catalysts and subsequent improvement of catalytic efficiency.

Original language	English (US)
Pages (from-to)	155-163
Number of pages	9
Journal	Journal of Electron Spectroscopy and Related Phenomena
Volume	150
Issue number	2-3
DOIs	https://doi.org/10.1016/j.elspec.2005.01.294
State	Published - Feb 2006
Externally published	Yes

Keywords

Anatase
Electron paramagnetic resonance (EPR)
Interfacial charge transfer
Mixed phase TiO
Photocatalysis
Rutile

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Radiation
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Spectroscopy
Physical and Theoretical Chemistry

Access to Document

10.1016/j.elspec.2005.01.294

Cite this

@article{f7166072bb934377b4ee7202e8f1939e,

title = "Probing reaction mechanisms in mixed phase TiO2 by EPR",

abstract = "Charge separation processes in mixed phase TiO2 photocatalysts are investigated by electron paramagnetic resonance (EPR) spectroscopy. The mechanisms of interfacial electron transfer, subsequent charge migration and recombination at surface sites, and other interfacial effects on chlorophenol/TiO2 chemistry have been probed. Distorted interfacial sites have been observed and are proposed as catalytically reactive hot spots. This detailed knowledge of charge transfer processes is critical to the nanoscale design of catalysts and subsequent improvement of catalytic efficiency.",

keywords = "Anatase, Electron paramagnetic resonance (EPR), Interfacial charge transfer, Mixed phase TiO, Photocatalysis, Rutile",

author = "Hurum, {D. C.} and Agrios, {A. G.} and Crist, {S. E.} and Gray, {K. A.} and T. Rajh and Thurnauer, {M. C.}",

note = "Funding Information: The authors thank Degussa for their generous donation of P25. This work was supported by the Northwestern University Institute for Environmental Catalysis (IEC), funded through a grant from the National Science Foundation (NSF), with matching funds from Northwestern University and the U.S. Department of Energy (CHE-9810378). IEC work at Argonne National Laboratory supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences, under contract W-31-109-Eng-38.",

year = "2006",

month = feb,

doi = "10.1016/j.elspec.2005.01.294",

language = "English (US)",

volume = "150",

pages = "155--163",

journal = "Journal of Electron Spectroscopy and Related Phenomena",

issn = "0368-2048",

publisher = "Elsevier",

number = "2-3",

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TY - JOUR

T1 - Probing reaction mechanisms in mixed phase TiO2 by EPR

AU - Hurum, D. C.

AU - Agrios, A. G.

AU - Crist, S. E.

AU - Gray, K. A.

AU - Rajh, T.

AU - Thurnauer, M. C.

N1 - Funding Information: The authors thank Degussa for their generous donation of P25. This work was supported by the Northwestern University Institute for Environmental Catalysis (IEC), funded through a grant from the National Science Foundation (NSF), with matching funds from Northwestern University and the U.S. Department of Energy (CHE-9810378). IEC work at Argonne National Laboratory supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences, under contract W-31-109-Eng-38.

PY - 2006/2

Y1 - 2006/2

N2 - Charge separation processes in mixed phase TiO2 photocatalysts are investigated by electron paramagnetic resonance (EPR) spectroscopy. The mechanisms of interfacial electron transfer, subsequent charge migration and recombination at surface sites, and other interfacial effects on chlorophenol/TiO2 chemistry have been probed. Distorted interfacial sites have been observed and are proposed as catalytically reactive hot spots. This detailed knowledge of charge transfer processes is critical to the nanoscale design of catalysts and subsequent improvement of catalytic efficiency.

AB - Charge separation processes in mixed phase TiO2 photocatalysts are investigated by electron paramagnetic resonance (EPR) spectroscopy. The mechanisms of interfacial electron transfer, subsequent charge migration and recombination at surface sites, and other interfacial effects on chlorophenol/TiO2 chemistry have been probed. Distorted interfacial sites have been observed and are proposed as catalytically reactive hot spots. This detailed knowledge of charge transfer processes is critical to the nanoscale design of catalysts and subsequent improvement of catalytic efficiency.

KW - Anatase

KW - Electron paramagnetic resonance (EPR)

KW - Interfacial charge transfer

KW - Mixed phase TiO

KW - Photocatalysis

KW - Rutile

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