Evaluation of electron–hole recombination properties of titanium(IV) oxide particles with high photocatalytic activity

Murakami, Shin-Ya; Kominami, Hiroshi; Kera, Yoshiya; Ikeda, Shigeru; Noguchi, Hidenori; Uosaki, Kohei; Ohtani, Bunsho

Evaluation of electron–hole recombination properties of titanium(IV) oxide particles with high photocatalytic activity

Murakami, Shin-Ya; Kominami, Hiroshi; Kera, Yoshiya et al.

Research on Chemical Intermediates, 2007, 33(3-5), 285-296

Permalink : https://hdl.handle.net/2115/48672

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アクセス権	open access
URI	https://hdl.handle.net/2115/48672
タイトル	Evaluation of electron–hole recombination properties of titanium(IV) oxide particles with high photocatalytic activity
著者	Murakami, Shin-Ya ; Kominami, Hiroshi ; Kera, Yoshiya ; Ikeda, Shigeru ; Noguchi, Hidenori ; Uosaki, Kohei ; Ohtani, Bunsho
著者名 Murakami, Shin-Ya
e-Rad_Researcher 00257966 著者名 Kominami, Hiroshi
e-Rad_Researcher 80028216 著者名 Kera, Yoshiya
e-Rad_Researcher 40312417 著者名 Ikeda, Shigeru
e-Rad_Researcher 60374188 著者名 Noguchi, Hidenori
e-Rad_Researcher 20133697 著者名 Uosaki, Kohei
e-Rad_Researcher 80176924 著者名 Ohtani, Bunsho
言語	英語
キーワード	Photocatalysis
	electron–hole recombination
	TiO2 particles
	femtosecond pump-probe diffuse reflection spectroscopy
	kinetics
発行日	2007
出版者	Springer
収録物名	Research on Chemical Intermediates
巻(号)	33(3-5)
ページ	285-296
抄録	Electron–hole recombination in nano-sized titanium(IV) oxide (TiO2) particles with various physical properties, which have been shown to be highly active photocatalysts, was evaluated by quantitative analysis of reduced titanium species (Ti3+), which might be formed at crystalline defective sites in TiO2 particles through photo-irradiation in the presence of a hole scavenger under deaerated conditions. These highly active photocatalyst samples were synthesized by hydrothermal crystallization in organic media (HyCOM method) and post-calcination. The Ti3+ density decreased with increasing calcination temperature (Tc), and a linear correlation was observed between the Ti3+ density and rate constant for electron–hole recombination evaluated by femtosecond pump-probe diffuse reflection spectroscopy. Reaction rate (RAg) and the amount of silver ions (Ag+) adsorbed on TiO2 particles ([Ag+]ads) were measured for photocatalytic silver metal deposition along with oxygen formation from an aqueous Ag+ solution under deaerated conditions, and the slope of the RAg versus [Ag+]ads plot was determined. Kinetic investigation of this reaction showed that the reciprocal of the slope was approximately related to the ratio of the rates for electron–hole recombination and electron trapping (kr/ke ratio). The kr/ke ratio decreased as Tc increased, and the logarithm of the kr/ke ratio was linearly related with Ti3+ density. These two parameters were used as a measure for the recombination properties of TiO2 photocatalysts with various physical properties.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	The original publication is available at springerlink.com
PISSN	0922-6168
EISSN	1568-5675
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1163/156856707779238612