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Photoinduced dynamics at the water/TiO$_2$(101) interface
Wagstaffe, M. (Corresponding author)DESY* ; Dominguez Castro, A.Extern* ; Wenthaus, L.DESY* ; Palutke, S.CFEL*DESY* ; Kutnyakhov, D.XFEL.EU*DESY* ; Heber, M.DESY* ; Pressacco, F.XFEL.EU*DESY* ; Dziarzhytski, S.DESY* ; Gleissner, H.Extern* ; Gupta, V. K. ; Redlin, H.Extern* ; Dominguez Garcia, A.MPG* ; Frauenheim, T. ; Rubio Secades, A.CFEL*MPG* ; Stierle, A. (Corresponding author)XFEL.EU*DESY* ; Noei, H.DESY*
2023
APS
College Park, Md.
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Please use a persistent id in citations: doi:10.1103/PhysRevLett.130.108001 doi:10.3204/PUBDB-2023-00580
Abstract: 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.
Contributing Institute(s):
- Nanolab (FS-NL)
- Ultrafast Lasers & X-rays Division (FS-CFEL-2)
- Laser Forschung und Entwicklung (FS-LA)
- FS-Photon Science (FS-PS)
- MPSD (CFEL-MPT)
- Uni Bremen (U Bremen)
- Uni Hamburg (U HH)
- FLASH Photonen-Strahlführungen und Optiken (FS-FLASH-B)
- FLASH Photonen-Diagnose und Steuerungen (FS-FLASH-D)
- FLASH Wissenschaftlicher Nutzerbetrieb (FS-FLASH-O)
- DOOR-User (DOOR ; HAS-User)
Research Program(s):
- 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
- 6G2 - FLASH (DESY) (POF4-6G2) (POF4-6G2)
- DFG project 390715994 - EXC 2056: CUI: Advanced Imaging of Matter (390715994) (390715994)
- FS-Proposal: F-20181204 (F-20181204) (F-20181204)
- QSpec-NewMat - Quantum Spectroscopy: exploring new states of matter out of equilibrium (694097) (694097)
- exciTitania - Excitonic quasiparticles in Titania (753874) (753874)
- DFG project 194651731 - EXC 1074: Hamburger Zentrum für ultraschnelle Beobachtung (CUI): Struktur, Dynamik und Kontrolle von Materie auf atomarer Skala (194651731) (194651731)
Experiment(s):
- FLASH Beamline PG2 (FLASH)
- DESY NanoLab: Surface Spectroscopy
Appears in the scientific report
2023
Database coverage:
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; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz

; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection