Wet electrons at the H2O/TiO2(110) surface

Ken Onda, Bin Li, Jin Zhao, Kenneth D. Jordan, Jinlong Yang, Hrvoje Petek

Research output: Contribution to journalArticlepeer-review

208 Citations (Scopus)

Abstract

At interfaces of metal oxide and water, partially hydrated or "wet-electron" states represent the lowest energy pathway for electron transfer. We studied the photoinduced electron transfer at the H 2O/TiO2(110) interface by means of time-resolved two-photon photoemission spectroscopy and electronic structure theory. At ∼1-monolayer coverage of water on partially hydroxylated TiO2 surfaces, we found an unoccupied electronic state 2.4 electron volts above the Fermi level. Density functional theory shows this to be a wet-electron state analogous to that reported in water clusters and which is distinct from hydrated electrons observed on water-covered metal surfaces. The decay of electrons from the wet-electron state to the conduction band of TiO2 occurs in ≤15 femtoseconds.

Original languageEnglish
Pages (from-to)1154-1158
Number of pages5
JournalScience
Volume308
Issue number5725
DOIs
Publication statusPublished - May 20 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

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