Department of Chemistry, Kobe University, Japan/Division of Advanced Molecular Science, Institute for Molecular Science, Japan

报告摘要：

The conversion of materials for artificial photosynthesis or wastewater treatment is accomplished in milliseconds or even seconds by assembling atoms over semiconductor photocatalysts [1]. Bandgap-excited electrons, holes, and molecular intermediates that are reactive on this time scale are key to the efficient assembly of atoms to yield the desired products. An ionic semiconductor lattice is deformed around such long-lived carriers to form polarons; each excess carrier is self-trapped in a Coulombic potential well created by ions shifting from their equilibrium positions. Our efforts to characterize long-lived polarons photoexcited in NaTaO3 [2,3] and TiO2 [4] photocatalysts using infrared light absorption are summarized in this talk.

[1] Kosaka, T.; Teduka, Y.; Ogura, T.; Zhou, Y.; Hisatomi, T.; Nishiyama, H.; Domen, K.; Takahashi, Y.; Onishi, H. Transient Kinetics of O2 Evolution in Photocatalytic Water-splitting Reaction. ACS Catalysis 2020, 23, 13159.

[2] Onishi, H. Sodium Tantalate Photocatalysts Doped with Metal Cations: Why Are They Active for Water Splitting? ChemSusChem 2019, 12, 1825.

[3] Fu, Z.; Hirai, T.; Onishi, H. Long-Life Electrons in Metal-Doped Alkali-Metal Tantalate Photocatalysts Excited under Water. J. Phys. Chem. C 2021, 125, 26398.

[4] Fu, Z.; Onishi, H. Infrared and Near-Infrared Spectrometry of Anatase and Rutile Particles Bandgap Excited in Liquid. . J. Phys. Chem. B 2023, 127, 321.

报告人简介：

Hiroshi Onishi is a professor of physical chemistry awarded by Japan Society of Vacuum and Surface Science and also Catalysis Society of Japan. His major research interests are in molecular science at interfaces and mechanistic aspects of catalytic reactions. He received his B.S., M.S., and Ph.D. in chemistry from Tokyo University.

1989    assistant professor, The University of Tokyo

1996    associate professor, The University of Tokyo

1999    principal investigator of Surface Chemistry Laboratory, Kanagawa Academy of Science and Technology

2004-now  professor, Kobe University

2017-2019      program officer, Japan Society for Promotion of Science

2021-2026      cross appointment professor, Institute for Molecular Science

邀请人：孟胜 　研究员

联系人：张坚地 研究员