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- W3100217047 abstract "Femtosecond X-ray laser pulses synchronized with an optical laser were employed to investigate the reaction dynamics of the photooxidation of CO on the anatase TiO2(101) surface in real time. Our time-resolved soft X-ray photoemission spectroscopy results provide evidence of ultrafast timescales and, coupled with theoretical calculations, clarify the mechanism of oxygen activation that is crucial to unraveling the underlying processes for a range of photocatalytic reactions relevant to air purification and self-cleaning surfaces. The reaction takes place between 1.2 and 2.8 (±0.2) ps after irradiation with an ultrashort laser pulse leading to the formation of CO2, prior to which no intermediate species were observed on a picosecond time scale. Our theoretical calculations predict that the presence of intragap unoccupied O2 levels leads to the formation of a charge-transfer complex. This allows the reaction to be initiated following laser illumination at a photon energy of 1.6 eV (770 nm), taking place via a proposed mechanism involving the direct transfer of electrons from TiO2 to physisorbed O2." @default.
- W3100217047 created "2020-11-23" @default.
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- W3100217047 date "2020-11-10" @default.
- W3100217047 modified "2023-10-14" @default.
- W3100217047 title "Ultrafast Real-Time Dynamics of CO Oxidation over an Oxide Photocatalyst" @default.
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- W3100217047 doi "https://doi.org/10.1021/acscatal.0c04098" @default.
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