Influence of O2-induced surface roughening on the chemistry of water on TiO2(110)
Journal Article
·
· Surface Science, 602(8):1507-1516
The impact of oxygen induced regrowth of TiO2 on the reduced rutile TiO2(110) surface has been studied using temperature programmed desorption (TPD) of adsorbed water multilayers. Pre-exposure of UHV annealed TiO2(110) surfaces to O2 at temperatures from 300 to 850 K induced changes in subsequent water TPDs that were interpreted in terms of the rougher surface morphologies resulting from the regrowth process. Water TPD from TiO2(110) previously oxidized at 300 K exhibited a new peak at *312 K due to reaction of water with O adatoms. These O adatoms were produced by dissociative adsorption of O2 at O-vacancy sites. Additionally, oxygen reacted (slowly) with surface Ti2O3 strands at RT. Water TPD from surfaces pre-oxidized at higher temperatures (P500 K) exhibited features reflective of desorption from rough surfaces, namely loss of peak resolution and eventual merger of the second layer and ice peaks, formation of a high temperature tail on the second layer peak, and broadening of the first layer TPD peak. The multiplicity of kinetically different adsorption sites on the roughened TiO2(110) surfaces contributed to the widening of the desorption features. Published by Elsevier B.V.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 950741
- Report Number(s):
- PNNL-SA-61040; 26715; KC0302010
- Journal Information:
- Surface Science, 602(8):1507-1516, Journal Name: Surface Science, 602(8):1507-1516 Journal Issue: 8 Vol. 602; ISSN SUSCAS; ISSN 0039-6028
- Country of Publication:
- United States
- Language:
- English
Similar Records
Insights into Photoexcited Electron Scavenging Processes on TiO2 Obtained from Studies of the Reaction of O2 with OH Groups Adsorbed at Electronic Defects on TiO2 (110)
Conversion of N2O to N? on TiO2 (110)
Relationship of O2 Photodesorption in Photooxidation of Acetone on TiO2
Journal Article
·
Wed Jan 15 23:00:00 EST 2003
· Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical
·
OSTI ID:15003803
Conversion of N2O to N? on TiO2 (110)
Journal Article
·
Wed Oct 15 00:00:00 EDT 2003
· Catalysis Today
·
OSTI ID:15006229
Relationship of O2 Photodesorption in Photooxidation of Acetone on TiO2
Journal Article
·
Thu Jul 31 00:00:00 EDT 2008
· Journal of Physical Chemistry C, 112(30):11433-11440
·
OSTI ID:939011