Bifunctionality of Rh3+ Modifier on TiO2 and Working Mechanism of Rh3+/TiO2 Photocatalyst under Irradiation of Visible Light

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• 作者：Sho Kitano ; Naoya Murakami ; Teruhisa Ohno ; Yasufumi Mitani ; Yoshio Nosaka ; Hiroyuki Asakura ; Kentaro Teramura ; Tsunehiro Tanaka ; Hiroaki Tada ; Keiji Hashimoto ; Hiroshi Kominami
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：May 30, 2013
• 年：2013
• 卷：117
• 期：21
• 页码：11008-11016
• 全文大小：380K
• 年卷期：v.117,no.21(May 30, 2013)
• ISSN：1932-7455

文摘

A rhodium(III) ion (Rh³⁺)-modified TiO₂ (Rh³⁺/TiO₂) photocatalyst, prepared by a simple adsorption method and exhibiting high levels of photocatalytic activity in degradation of organic compounds, was investigated by using X-ray absorption fine structure (XAFS) measurements, (photo)electrochemical measurements, double-beam photoacoustic (DB-PA) spectroscopic measurements, and photoluminescence measurements. Based on the results, the features of the Rh³⁺ modifier and the working mechanism of the Rh³⁺/TiO₂ photocatalyst are discussed. XAFS measurements revealed that the Rh³⁺ species were highly dispersed and almost atomically isolated on TiO₂. The (photo)electrochemical measurements, DB-PA spectroscopic measurements, and photoluminescence showed a unique bifunction of the Rh³⁺ modifier as a promoter for O₂ reductions and an electron injector to the conduction band of TiO₂ for response to visible light. The reasons for the Rh³⁺/TiO₂ photocatalyst exhibiting higher levels of photocatalytic activity than those of TiO₂ photocatalysts modified with other metal ions are also discussed on the basis of obtained results.