ESR Study on the Reversible Electron Transfer from O22− to Ti4+ on TiO2 Nanoparticles Induced by Visible-Light Illumination

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• 作者：Kenji Komaguchi ; Takanori Maruoka ; Haruka Nakano ; Ichiro Imae ; Yousuke Ooyama ; Yutaka Harima
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：January 29, 2009
• 年：2009
• 卷：113
• 期：4
• 页码：1160-1163
• 全文大小：119K
• 年卷期：v.113,no.4(January 29, 2009)
• ISSN：1932-7455

文摘

Photoinduced electron transfer reactions of O₂ molecules adsorbed on the H₂-reduced surface of TiO₂ (rutile) nanoparticles have been studied at 77 K by in situ ESR spectroscopy. Upon visible-light illumination, ESR signals due to O₂⁻ (g_z = 2.020) and Ti³⁺ appeared and then returned to the original ones by raising the temperature in the dark. The numbers of O₂⁻ and Ti³⁺ ions formed by illumination were equal, suggesting that a reversible electron transfer between peroxo O₂²⁻ species and the adjacent Ti⁴⁺ ion occurs by sub-band gap illumination of TiO₂.