Tetraoxygen on Reduced Ti02(110): Oxygen Adsorption and Reactions with Oxygen Vacancies

Journal Article · Fri May 16 00:00:00 EDT 2008 · Physical Review Letters, 100(19):Art. No. 196102

DOI:https://doi.org/10.1103/PhysRevLett.100.196102· OSTI ID:937033

Kimmel, Greg A; Petrik, Nikolay G

Oxygen adsorption on reduced TiO2(110) is investigated using temperature programmed desorption and electron-stimulated desorption. At low temperatures, two O2 molecules can be chemisorbed in each oxygen vacancy, Ov. These molecules do not desorb upon annealing to 700 K. Instead for 200 K < T < 400 K, the two O2 convert to another species which has four oxygen atoms, i.e. tetraoxygen, that decomposes at higher temperatures. In contrast when only 1 O2 is adsorbed in an oxygen vacancy, the molecule dissociates upon annealing above ~150 K to heal the vacancy in agreement with previous results.

• 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: 937033
• Report Number(s): PNNL-SA-58431; 24799; 24800; KC0301020
• Journal Information: Physical Review Letters, 100(19):Art. No. 196102, Journal Name: Physical Review Letters, 100(19):Art. No. 196102 Journal Issue: 19 Vol. 100; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADSORPTION
ANNEALING
CHEMISORPTION
DECOMPOSITION
Environmental Molecular Sciences Laboratory
OXYGEN
TITANIUM OXIDES
VACANCIES