Water Dissociation on Single Crystalline Anatase TiO2(001) Studied by Photoelectron Spectroscopy

Blomquist, JakobLund University,Lunds universitet,Kemisk fysik,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Chemical Physics,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH (författare)

The adsorption of water on the anatase TiO2(001)-(4 x 1) surface is studied using synchrotron radiation-excited core level photoelectron spectroscopy. The coverage-dependent adsorption of water at low temperature is monitored and compared to the sequence obtained after heating of a water multilayer. Two adsorption phases of submonolayer coverage can be defined: Phase 1 consists only of dissociated water, observed as OH-groups. This phase is found at low coverage at low temperature (190 K) and is the only state of adsorbed water above similar to 230 K. The saturation coverage of phase 1 is consistent with dissociation on the 4-fold-coordinated Ti ridge atoms of the (4 x 1) surface reconstruction. Phase 2 is found at higher coverage, reached at lower temperature. It consists of a mixture of dissociated and molecular water with a ratio of 1:1 at 170 K. The molecular water is found to bond to the hydroxyl groups. The hydroxyl coverage of phase 2 is approximately 2 times that of phase 1. The results suggest that the OH and H2O species of phase 2 are confined to the ridges of the surface.

Walle, L. E. (författare)
Uvdal, PerLund University,Lunds universitet,Kemisk fysik,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Chemical Physics,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)chph-puv (författare)
Borg, A. (författare)
Sandell, A.Uppsala universitet,Yt- och gränsskiktsvetenskap,Molekyl- och kondenserade materiens fysik(Swepub:uu)andesand (författare)
Kemisk fysikEnheten för fysikalisk och teoretisk kemi (creator_code:org_t)

Ingår i:The Journal of Physical Chemistry C: American Chemical Society (ACS)112:42, s. 16616-166211932-74471932-7455

Av författaren/redakt...: Blomquist, Jakob; Walle, L. E.; Uvdal, Per; Borg, A.; Sandell, A.

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