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- W3136336440 abstract "• 20 % selectivity to C 2 H 6 is achieved over Au/TiO 2-x under visible light irradiation. • Positively-charged Au clusters due to plasmonic excitation stabilize adsorbed CO. • The CO 2 photocatalytic reduction mechanism is unravelled with in-situ DRIFTS. • Oxygen vacancies are crucial for photocatalytic CO 2 reduction with H 2 O. CO 2 photocatalytic conversion with H 2 O is an attractive technology to convert green-house gas into value-added chemicals. However, the main limitation of this process is the low selectivity to products higher than C1. The reaction mechanism, especially C C coupling mechanism, is still ambiguous. In this work, the photocatalytic CO 2 reduction with H 2 O is investigated on oxygen-deficient Au/TiO 2-x driven by UV or visible light under continuous flow condition. Notably, an exceptional high selectivity of 20 % towards C 2 H 6 is achieved over 2.76 wt% Au/TiO 2-x under plasmonic excitation with the essential involvement of oxygen vacancy (V O ). The reaction pathway is reasonably proposed based on a series of in-situ characterization results: the in-situ DRIFTS determined key reaction intermediates, electronic property of Au under excitation state and the critical role of V O . The high selectivity towards C 2 H 6 is explained by the slightly positive-charged Au in Au/TiO 2-x under plasmonic excitation and the enhanced *CO stability." @default.
- W3136336440 created "2021-03-29" @default.
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- W3136336440 date "2021-09-01" @default.
- W3136336440 modified "2023-10-17" @default.
- W3136336440 title "Unravelling the C C coupling in CO2 photocatalytic reduction with H2O on Au/TiO2-x: Combination of plasmonic excitation and oxygen vacancy" @default.
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- W3136336440 doi "https://doi.org/10.1016/j.apcatb.2021.120147" @default.
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