The mechanism of emerging catalytic activity of gold nano-clusters on rutile TiO 2(110) in CO oxidation reaction

K. Mitsuhara, M. Tagami, T. Matsuda, A. Visikovskiy, M. Takizawa, Y. Kido

Research output: Contribution to journalArticle

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Abstract

This paper reveals the fact that the O adatoms (O ad) adsorbed on the 5-fold Ti rows of rutile TiO 2(110) react with CO to form CO 2 at room temperature and the oxidation reaction is pronouncedly enhanced by Au nano-clusters deposited on the above O-rich TiO 2(110) surfaces. The optimum activity is obtained for 2D clusters with a lateral size of ∼1.5 nm and two-atomic layer height corresponding to ∼50 Au atomscluster. This strong activity emerging is attributed to an electronic charge transfer from Au clusters to O-rich TiO 2(110) supports observed clearly by work function measurement, which results in an interface dipole. The interface dipoles lower the potential barrier for dissociative O 2 adsorption on the surface and also enhance the reaction of CO with the O ad atoms to form CO 2 owing to the electric field of the interface dipoles, which generate an attractive force upon polar CO molecules and thus prolong the duration time on the Au nano-clusters. This electric field is screened by the valence electrons of Au clusters except near the perimeter interfaces, thereby the activity is diminished for three-dimensional clusters with a larger size.

Original languageEnglish
Article number124303
JournalJournal of Chemical Physics
Volume136
Issue number12
DOIs
Publication statusPublished - Mar 28 2012

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Carbon Monoxide
Gold
rutile
catalytic activity
emerging
Catalyst activity
gold
Oxidation
oxidation
Adatoms
dipoles
adatoms
Electric fields
electric fields
Charge transfer
titanium dioxide
Adsorption
Atoms
charge transfer
Molecules

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

The mechanism of emerging catalytic activity of gold nano-clusters on rutile TiO 2(110) in CO oxidation reaction. / Mitsuhara, K.; Tagami, M.; Matsuda, T.; Visikovskiy, A.; Takizawa, M.; Kido, Y.

In: Journal of Chemical Physics, Vol. 136, No. 12, 124303, 28.03.2012.

Research output: Contribution to journalArticle

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