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Topics in Catalysis

, Volume 61, Issue 1–2, pp 92–105 | Cite as

Dissociative Water Adsorption on Gas-Phase Titanium Dioxide Cluster Anions Probed with Infrared Photodissociation Spectroscopy

  • Marissa L. Weichman
  • Sreekanta Debnath
  • John T. Kelly
  • Sandy Gewinner
  • Wieland Schöllkopf
  • Daniel M. Neumark
  • Knut R. Asmis
Original Paper

Abstract

Gas-phase complexes of water on small titanium oxide clusters are model systems to examine the molecular-level mechanism of dissociative water adsorption at defect sites on bulk titania surfaces. Here, we report infrared photodissociation (IRPD) spectra for [(TiO2) n (D2O m )] clusters with n = 2–4 and m = 1–3; the clusters are tagged with weakly-bound D2 so that only single photon absorption is required for photodissociation. Vibrational features are reported in the spectral windows of 400–1200 and 2600–3000 cm− 1 , capturing both fingerprint cluster modes and O–D stretching modes. The IRPD spectra are interpreted with the aid of ωB97X-D/aug-cc-pVDZ density functional theory calculations. We conclusively assign the IRPD spectra of the n = 2, m = 1,2 and n = 3, m = 1–3 clusters to global minimum-energy structures containing dissociatively adsorbed water. We also provide insight into the more complicated spectroscopy of the n = 4 clusters, which show possible contributions from a kinetically trapped reactive intermediate in addition to the global minimum-energy isomer. From this work, we can draw conclusions about the size dependence and site-specificity of (TiO2) n cluster reactivity.

Keywords

Infrared photodissociation spectroscopy Metal oxide clusters Titanium dioxide Dissociative water adsorption Water splitting catalysis Density functional theory 

Notes

Acknowledgements

This research is funded by the Air Force Office of Scientific Research under Grant No. FA9550-12-1-0160 and by the German Research Foundation (DFG) within the Collaborative Research Center 1109 “Metal Oxide/Water Systems.” Calculations were carried out in part using the UC Berkeley College of Chemistry Molecular Graphics and Computation Facility, which is funded by the National Institutes of Health under Grant No. S10OD023532. M.L.W. thanks the National Science Foundation for a graduate research fellowship.

Supplementary material

11244_2017_863_MOESM1_ESM.docx (14.8 mb)
Supplementary material 1 (DOCX 15138 KB)

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© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.Department of ChemistryUniversity of CaliforniaBerkeleyUSA
  2. 2.Fritz-Haber-Institut der Max-Plank-GesellschaftBerlinGermany
  3. 3.Wilhelm-Ostwald-Institut für Physikalische und Theoretische ChemieUniversität LeipzigLeipzigGermany
  4. 4.Chemical Sciences DivisionLawrence Berkeley National LaboratoryBerkeleyUSA

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