Oxygen adsorption on Pt(110)-(1 × 2) and Pt(110)-(1 × 1)

The adsorption of oxygen on the reconstructed Pt(110)-(1 × 2) surface at 120–500 K was investigated by O 1s core level spectroscopy and by measurements of work function changes. Molecular and atomic oxygen could be distinguished by O 1s binding energies at 530.7 and 529.9 eV, respectively. The initi...

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Bibliographic Details
Published in:Surface science 1986-02, Vol.166 (1), p.206-220
Main Authors: Freyer, N., Kiskinova, M., Pirug, G., Bonzel, H.P.
Format: Article
Language:English
Subjects:
Applied sciences
Chemistry
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
General and physical chemistry
Materials science
Metals, semimetals and alloys
Metals. Metallurgy
Physics
Solid-gas interface
Specific materials
Surface physical chemistry
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Summary:The adsorption of oxygen on the reconstructed Pt(110)-(1 × 2) surface at 120–500 K was investigated by O 1s core level spectroscopy and by measurements of work function changes. Molecular and atomic oxygen could be distinguished by O 1s binding energies at 530.7 and 529.9 eV, respectively. The initial sticking coefficients were 0.9 for molecular oxygen at 120 K and 0.3 for atomic oxygen at 300 K, with maximum coverages of 1.35 and 0.35, respectively. Repeated low temperature O 2 exposures and heating to 300 K resulted in a maximum coverage of 0.85 at 300 K. There was always a work function increase after oxygen adsorption; the dipole moment of initially adsorbed molecular oxygen was twice that of atomic oxygen. For comparison, oxygen was also adsorbed on the metastable Pt(110)-(1 × 1) surface at 120–250 K. The maximum coverage at 250 K was 0.8 on (1 × 1) compared to 0.35 on (1 × 2). All data are consistently explained by assuming that the adsorption sites on close-packed atomic rows in [1 10] direction have the highest, rate-determining activity for O 2 adsorption and dissociation.
ISSN:0039-6028
1879-2758
DOI:10.1016/0039-6028(86)90541-8