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 language | English |
|---|---|
| Article number | 124303 |
| Journal | Journal of Chemical Physics |
| Volume | 136 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - Mar 28 2012 |
Fingerprint
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 journal › Article
}
TY - JOUR
T1 - The mechanism of emerging catalytic activity of gold nano-clusters on rutile TiO 2(110) in CO oxidation reaction
AU - Mitsuhara, K.
AU - Tagami, M.
AU - Matsuda, T.
AU - Visikovskiy, A.
AU - Takizawa, M.
AU - Kido, Y.
PY - 2012/3/28
Y1 - 2012/3/28
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84859530352&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84859530352&partnerID=8YFLogxK
U2 - 10.1063/1.3697478
DO - 10.1063/1.3697478
M3 - Article
C2 - 22462853
AN - SCOPUS:84859530352
VL - 136
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 12
M1 - 124303
ER -