Home > Publications database > Photoinduced dynamics at the water/TiO$_2$(101) interface > print

001     517619
005     20250715173103.0
024 7 _ |a 10.1103/PhysRevLett.130.108001
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100 1 _ |a Wagstaffe, Michael
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245 _ _ |a Photoinduced dynamics at the water/TiO$_2$(101) interface
260 _ _ |a College Park, Md.
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520 _ _ |a We present a femtosecond time-resolved optical pump-soft x-ray probe photoemission study in which we follow the dynamics of charge transfer at the interface of water and anatase TiO$_2$(101). By combining our observation of transient oxygen O 1s core level peak shifts at submonolayer water coverages with Ehrenfest molecular dynamics simulations we find that ultrafast interfacial hole transfer from TiO$_2$ to molecularly adsorbed water is completed within the 285 fs time resolution of the experiment. This is facilitated by the formation of a new hydrogen bond between an O$_2$c site at the surface and a physisorbed water molecule. The calculations fully corroborate our experimental observations and further suggest that this process is preceded by the efficient trapping of the hole at the surface of TiO$_2$ by hydroxyl species (-OH), that form following the dissociative adsorption of water. At a water coverage exceeding a monolayer, interfacial charge transfer is suppressed. Our findings are directly applicable to a wide range of photocatalytic systems in which water plays a critical role.
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700 1 _ |a Dominguez Castro, Adrian
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700 1 _ |a Wenthaus, Lukas
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700 1 _ |a Palutke, Steffen
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700 1 _ |a Heber, Michael
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700 1 _ |a Gupta, Verena Kristin
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700 1 _ |a Frauenheim, Thomas
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700 1 _ |a Rubio Secades, Angel
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700 1 _ |a Stierle, Andreas
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700 1 _ |a Noei, Heshmat
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773 _ _ |a 10.1103/PhysRevLett.130.108001
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