Journal Article PUBDB-2023-00580

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Photoinduced dynamics at the water/TiO$_2$(101) interface

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2023
APS College Park, Md.

Physical review letters 130, 108001 () [10.1103/PhysRevLett.130.108001]
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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.

Classification:

Contributing Institute(s):
  1. Nanolab (FS-NL)
  2. Ultrafast Lasers & X-rays Division (FS-CFEL-2)
  3. Laser Forschung und Entwicklung (FS-LA)
  4. FS-Photon Science (FS-PS)
  5. MPSD (CFEL-MPT)
  6. Uni Bremen (U Bremen)
  7. Uni Hamburg (U HH)
  8. FLASH Photonen-Strahlführungen und Optiken (FS-FLASH-B)
  9. FLASH Photonen-Diagnose und Steuerungen (FS-FLASH-D)
  10. FLASH Wissenschaftlicher Nutzerbetrieb (FS-FLASH-O)
  11. DOOR-User (DOOR ; HAS-User)
Research Program(s):
  1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
  2. 6G2 - FLASH (DESY) (POF4-6G2) (POF4-6G2)
  3. DFG project 390715994 - EXC 2056: CUI: Advanced Imaging of Matter (390715994) (390715994)
  4. FS-Proposal: F-20181204 (F-20181204) (F-20181204)
  5. QSpec-NewMat - Quantum Spectroscopy: exploring new states of matter out of equilibrium (694097) (694097)
  6. exciTitania - Excitonic quasiparticles in Titania (753874) (753874)
  7. DFG project 194651731 - EXC 1074: Hamburger Zentrum für ultraschnelle Beobachtung (CUI): Struktur, Dynamik und Kontrolle von Materie auf atomarer Skala (194651731) (194651731)
Experiment(s):
  1. FLASH Beamline PG2 (FLASH)
  2. DESY NanoLab: Surface Spectroscopy

Appears in the scientific report 2023
Database coverage:
Medline ; OpenAccess ; 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 ; NationallizenzNationallizenz ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection
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The record appears in these collections:
Private Collections > >Extern > >HAS-User > >FS-UNI > U Bremen
Private Collections > >DESY > >Others > >UNI > U HH
Private Collections > >CFEL > >MPSD > CFEL-MPT
Private Collections > >Extern > >HAS-User > HAS-User
Private Collections > >DESY > >FS > FS-FLASH-D
Private Collections > >DESY > >FS > FS-FLASH-B
Private Collections > >DESY > >FS > FS-FLASH-O
Private Collections > >DESY > >FS > FS-CFEL-2
Private Collections > >DESY > >FS > FS-PS
Private Collections > >DESY > >FS > FS-LA
Private Collections > >DESY > >FS > FS-NL
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 Record created 2023-01-31, last modified 2025-07-15