Photodesorption and Trapping of Molecular Oxygen at the TiO2(110)-Water Ice Interface

Craig L. Perkins; Michael A. Henderson

doi:10.1021/jp0031799

Photodesorption and Trapping of Molecular Oxygen at the TiO2(110)-Water Ice Interface

Craig L. Perkins
, Michael A. Henderson

Materials Science

Environmental Molecular Sciences Laboratory

Research output: Contribution to journal › Article › peer-review

77 Scopus Citations

Abstract

By means of temperature programmed desorption (TPD), static secondary ion mass spectroscopy (SSIMS), and electron energy loss spectroscopy (EELS), we have investigated further the states of oxygen adsorbed on rutile TiO₂. Previous work has shown that annealing the (110) surface in a vacuum produces isolated bridging oxygen vacancies, and that these vacancies are intimately connected with molecular and dissociative oxygen adsorption channels. We find that at 115 K illumination of the oxygen-exposed surface with 4.1 eV photons results in photodesorption of the oxygen associated with a TPD state centered on 410 K, in contrast to the remaining oxygen destined for a dissociative channel. An unusual effect of water overlayers on the photochemical properties of the O/TiO₂(110) system is explored. For thick overlayers, it is possible to generate via UV irradiation a previously unobserved oxygen TPD state. Evidence is presented for this new O₂ TPD state originating from the photolysis of an O₂-water adduct.

Original language	American English
Pages (from-to)	3856-3863
Number of pages	8
Journal	Journal of Physical Chemistry B
Volume	105
Issue number	18
DOIs	https://doi.org/10.1021/jp0031799 https://doi.org/10.1021/jp0031799
State	Published - 2001

NLR Publication Number

NREL/JA-520-30607

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title = "Photodesorption and Trapping of Molecular Oxygen at the TiO2(110)-Water Ice Interface",

abstract = "By means of temperature programmed desorption (TPD), static secondary ion mass spectroscopy (SSIMS), and electron energy loss spectroscopy (EELS), we have investigated further the states of oxygen adsorbed on rutile TiO2. Previous work has shown that annealing the (110) surface in a vacuum produces isolated bridging oxygen vacancies, and that these vacancies are intimately connected with molecular and dissociative oxygen adsorption channels. We find that at 115 K illumination of the oxygen-exposed surface with 4.1 eV photons results in photodesorption of the oxygen associated with a TPD state centered on 410 K, in contrast to the remaining oxygen destined for a dissociative channel. An unusual effect of water overlayers on the photochemical properties of the O/TiO2(110) system is explored. For thick overlayers, it is possible to generate via UV irradiation a previously unobserved oxygen TPD state. Evidence is presented for this new O2 TPD state originating from the photolysis of an O2-water adduct.",

author = "Perkins, \{Craig L.\} and Henderson, \{Michael A.\}",

year = "2001",

doi = "10.1021/jp0031799",

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volume = "105",

pages = "3856--3863",

journal = "Journal of Physical Chemistry B",

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publisher = "American Chemical Society",

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TY - JOUR

T1 - Photodesorption and Trapping of Molecular Oxygen at the TiO2(110)-Water Ice Interface

AU - Perkins, Craig L.

AU - Henderson, Michael A.

PY - 2001

Y1 - 2001

N2 - By means of temperature programmed desorption (TPD), static secondary ion mass spectroscopy (SSIMS), and electron energy loss spectroscopy (EELS), we have investigated further the states of oxygen adsorbed on rutile TiO2. Previous work has shown that annealing the (110) surface in a vacuum produces isolated bridging oxygen vacancies, and that these vacancies are intimately connected with molecular and dissociative oxygen adsorption channels. We find that at 115 K illumination of the oxygen-exposed surface with 4.1 eV photons results in photodesorption of the oxygen associated with a TPD state centered on 410 K, in contrast to the remaining oxygen destined for a dissociative channel. An unusual effect of water overlayers on the photochemical properties of the O/TiO2(110) system is explored. For thick overlayers, it is possible to generate via UV irradiation a previously unobserved oxygen TPD state. Evidence is presented for this new O2 TPD state originating from the photolysis of an O2-water adduct.

AB - By means of temperature programmed desorption (TPD), static secondary ion mass spectroscopy (SSIMS), and electron energy loss spectroscopy (EELS), we have investigated further the states of oxygen adsorbed on rutile TiO2. Previous work has shown that annealing the (110) surface in a vacuum produces isolated bridging oxygen vacancies, and that these vacancies are intimately connected with molecular and dissociative oxygen adsorption channels. We find that at 115 K illumination of the oxygen-exposed surface with 4.1 eV photons results in photodesorption of the oxygen associated with a TPD state centered on 410 K, in contrast to the remaining oxygen destined for a dissociative channel. An unusual effect of water overlayers on the photochemical properties of the O/TiO2(110) system is explored. For thick overlayers, it is possible to generate via UV irradiation a previously unobserved oxygen TPD state. Evidence is presented for this new O2 TPD state originating from the photolysis of an O2-water adduct.

UR - https://www.scopus.com/pages/publications/0035838004

U2 - 10.1021/jp0031799

DO - 10.1021/jp0031799

M3 - Article

AN - SCOPUS:0035838004

SN - 1520-6106

VL - 105

SP - 3856

EP - 3863

JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

IS - 18

ER -

Photodesorption and Trapping of Molecular Oxygen at the TiO2(110)-Water Ice Interface

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