A surface science approach to unveiling the TiO2 photocatalytic mechanism: Correlation between photocatalytic activity and carrier lifetime

• Ozawa Kenichi

  Department of Chemistry, Tokyo Institute of Technology

• Yamamoto Susumu

  Institute for Solid State Physics, The University of Tokyo

• Mase Kazuhiko

  Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK) SOKENDAI (The Graduate University for Advanced Studies)

• Matsuda Iwao

  Institute for Solid State Physics, The University of Tokyo Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

書誌事項

タイトル別名

• A Surface Science Approach to Unveiling the TiO₂ Photocatalytic Mechanism: Correlation between Photocatalytic Activity and Carrier Lifetime

抄録

Establishing an accurate view of the photocatalytic mechanism of titanium dioxide (TiO₂) has been a challenging task since the discovery of the Honda-Fujishima effect. Despite the great success of catalytic studies in elucidating the chemical and physical aspects of photocatalysis, many questions remain. A surface science approach, which is characterized by the use of atomically well-defined surfaces in precisely controlled environments, is a powerful tool to shed light on the fundamental mechanism, especially the dynamics of photoexcited carriers. In the present contribution, recent progress in photocatalytic research that correlates photocatalytic activity and carrier dynamics on rutile and anatase TiO₂ is reviewed. A special focus is placed on the lifetime of photoexcited carriers. We present a method to determine the carrier lifetime; pump-probe time-resolved soft X-ray photoelectron spectroscopy, utilizing an ultraviolet laser as a pump light and a synchrotron radiation as a probe light. The carrier lifetime is found to be linearly correlated with the photocatalytic decomposition/desorption rate of acetic acid adsorbed on single-crystal TiO₂ surfaces. The important role of a potential barrier on the TiO₂ surface, which influences the carrier lifetime and the photocatalytic activity, is discussed.

収録刊行物

• e-Journal of Surface Science and Nanotechnology

  e-Journal of Surface Science and Nanotechnology 17 (0), 130-147, 2019-09-07

  公益社団法人 日本表面真空学会

キーワード

• <i> Photocatalysis</i>
• <i>Carrier lifetime</i>
• <i>Photoelectron spectroscopy</i>
• <i>Synchrotron radiation</i>
• <i> Time-resolved measurement</i>

詳細情報

• CRID: 1390845702277584640
• NII論文ID: 130007704149
• DOI: 10.1380/ejssnt.2019.130
• ISSN: 13480391
• Web Site: https://www.jstage.jst.go.jp/article/ejssnt/17/0/17_130/_pdf
• 本文言語コード: en
• データソース種別:
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  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可