期刊
E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY
卷 17, 期 -, 页码 130-147出版社
SURFACE SCI SOC JAPAN
DOI: 10.1380/ejssnt.2019.130
关键词
Photocatalysis; Carrier lifetime; Photoelectron spectroscopy; Synchrotron radiation; Time-resolved measurement
资金
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [16H03867, 16H06027]
- Grants-in-Aid for Scientific Research [16H03867, 16H06027] Funding Source: KAKEN
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 photocatalync 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 photo catalytic activity, is discussed.
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