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Quantitative analysis of defective sites in titanium(IV) oxide photocatalyst powders

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Title: Quantitative analysis of defective sites in titanium(IV) oxide photocatalyst powders
Authors: Ikeda, Shigeru Browse this author →KAKEN DB
Sugiyama, Noboru Browse this author
Murakami, Shin-ya Browse this author
Kominami, Hiroshi Browse this author →KAKEN DB
Kera, Yoshiya Browse this author →KAKEN DB
Noguchi, Hidenori Browse this author →KAKEN DB
Uosaki, Kohei Browse this author →KAKEN DB
Torimoto, Tsukasa Browse this author →KAKEN DB
Ohtani, Bunsho Browse this author →KAKEN DB
Issue Date: 2003
Publisher: Royal Society of Chemistry
Journal Title: Physical Chemistry Chemical Physics
Volume: 5
Issue: 4
Start Page: 778
End Page: 783
Publisher DOI: 10.1039/b206594k
Abstract: The molar amounts of defective sites (Md) in several titanium(IV) oxide (TiO2) powders were determined using photoinduced reactions of electron accumulation in deaerated aqueous solutions containing sacrificial hole scavengers and subsequent reduction of methylviologen to its cation radical. Measurements of pH dependence of typical anatase and rutile TiO2 powders showed that these defective sites were of electronic energy just below the conduction band edge of TiO2 in ranges of 0–0.35 V for anatase and 0–0.25 V for rutile. A linear relation of Md with the rate constant of electron-hole recombination determined by femtosecond pump-probe diffuse reflection spectroscopy revealed that Md could be a quantitative parameter of recombination between a photoexcited electron and a positive hole. The fact that there was no linear relation between Md and the specific surface area suggests that the surface area was not directly reflected on Md. A reciprocal correlation between photocatalytic activity for water oxidation in aqueous silver sulfate solution and Md revealed that the rate of recombination is one of the predominant physical properties governing the activities of TiO2 powders in this reaction system.
Rights: Phys. Chem. Chem. Phys., 2003, 5, 778-783 - Reproduced by permission of the PCCP Owner Societies
Type: article (author version)
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大谷 文章

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