Photoinduced Dissociation of O2 on Rutile TiO2(110)

Journal Article · Thu Jun 17 04:00:00 EDT 2010 · The Journal of Physical Chemistry Letters, 1(12):1758-1762

DOI:https://doi.org/10.1021/jz100513e· OSTI ID:984998

Petrik, Nikolay G; Kimmel, Gregory A

The adsorption and photon-stimulated reactions of O2 adsorbed on reduced, rutile TiO2(110) are investigated. After adsorption at 28 K and annealing to 100 K, at least 85% of the adsorbed oxygen has not dissociated. Typically less than 50% of this molecularly adsorbed O2 desorbs via hole-mediated reactions during irradiation with ultraviolet (UV) photons. However, UV irradiation dissociates ~20 .-. 45 % of the chemisorbed O2, which we propose to occur through electron attachment reactions. In addition, weakly bound (physisorbed) O2 readily reacts with chemisorbed O2 during UV irradiation. These results show that the photochemistry of oxygen on TiO2(110) is both diverse and more complicated than previously appreciated.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 984998
• Report Number(s): PNNL-SA-72411; KC0301020; KC0302010
• Journal Information: The Journal of Physical Chemistry Letters, 1(12):1758-1762, Journal Name: The Journal of Physical Chemistry Letters, 1(12):1758-1762 Journal Issue: 12 Vol. 1
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ADSORPTION
ANNEALING
DISSOCIATION
ELECTRON ATTACHMENT
IRRADIATION
OXYGEN
PHOTOCHEMISTRY
PHOTONS
RUTILE