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Photo-induced charging effect and electron transfer to the redox species on nitrogen-doped TiO2 under visible light irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
47809 46482 2009 6 PDF Available
Title
Photo-induced charging effect and electron transfer to the redox species on nitrogen-doped TiO2 under visible light irradiation
Abstract

Energy levels for sub-band structures of the nitrogen-doped TiO2 (N-TiO2) and photo-excitation mechanism for the visible light response were investigated by photo-electrochemical and spectroscopic measurements. It was demonstrated that the photo-excitation from the N-doping level of N-TiO2 causes the accumulation of electrons into the sub-band level at the potential energy of ca. +0.35 V vs. NHE (pH 2.5) under visible light irradiation. Subsequently, electron transfer does not take place from the photo-charged N-TiO2 under visible light irradiation into such redox species as methyl viologen (MV2+), H+, Cu2+ ions, but into O2 molecules, Pt4+, Ag+ and Au3+ ions by way of the sub-band level. These findings shed light on a mechanism for the photocatalytic reactions on the N-TiO2 under visible light irradiation.

Keywords
Nitrogen-doped TiO2; Photocatalyst; Visible light; Photo-charging; Photo-electrochemistry; Charge separation; Redox potential; Electron transfer
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Photo-induced charging effect and electron transfer to the redox species on nitrogen-doped TiO2 under visible light irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 89, Issues 3–4, 15 July 2009, Pages 557–562
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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Any Questions? feel free to contact us