CO Adsorption on Reconstructed Ir(100) Surfaces from UHV to mbar Pressure: A LEED, TPD, and PM-IRAS Study Full article
Journal |
The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455 |
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Output data | Year: 2016, Volume: 120, Number: 20, Pages: 10838-10848 Pages count : 11 DOI: 10.1021/acs.jpcc.5b12494 | ||||||
Tags | Absorption spectroscopy; Adsorbates; Adsorption; Carbon dioxide; Desorption; Electrons; Low energy electron diffraction; Single crystals; Surface treatment; Temperature programmed desorption | ||||||
Authors |
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Affiliations |
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Funding (2)
1 | FWF Austrian Science Fund | F4502-N16 (SFB FOXSI) |
2 | FWF Austrian Science Fund | I 1041-N28 (ComCat) |
Abstract:
Clean and stable surface modifications of an iridium (100) single crystal, i.e., the (1 × 1) phase, the (5 × 1) reconstruction, and the oxygen-terminated (2 × 1)-O surface, were prepared and characterized by low energy electron diffraction (LEED), temperature-programmed desorption (TPD), infrared reflection absorption spectroscopy (IRAS) and polarization modulation IRAS (PM-IRAS). The adsorption of CO in UHV and at elevated (mbar) pressure/temperature was followed both ex situ and in situ on all three surface modifications, with a focus on mbar pressures of CO. The Ir(1 × 1) surface exhibited c(4 × 2)/c(2 × 2) and c(6 × 2) CO structures under low pressure conditions, and remained stable up to 100 mbar and 700 K. For the (2 × 1)-O reconstruction CO adsorption induced a structural change from (2 × 1)-O to (1 × 1), as confirmed by LEED, TPD, and IR. For Ir (2 × 1)-O TPD indicated that CO reacted with surface oxygen forming CO2. The (5 × 1) reconstruction featured a reversible and dynamic behavior upon CO adsorption, with a local lifting of the reconstruction to (1 × 1). After CO desorption, the (5 × 1) structure was restored. All three reconstructions exhibited CO adsorption with on-top geometry, as evidenced by IR. With increasing CO exposure the resonances shifted to higher wavenumber, due to adsorbate–adsorbate and adsorbate–substrate interactions. The largest wavenumber shift (from 2057 to 2100 cm–1) was observed for Ir(5 × 1) upon CO dosing from 1 L to 100 mbar.
Cite:
Anic K.
, Bukhtiyarov A.V.
, Li H.
, Rameshan C.
, Rupprechter G.
CO Adsorption on Reconstructed Ir(100) Surfaces from UHV to mbar Pressure: A LEED, TPD, and PM-IRAS Study
The Journal of Physical Chemistry C. 2016. V.120. N20. P.10838-10848. DOI: 10.1021/acs.jpcc.5b12494 WOS Scopus РИНЦ
CO Adsorption on Reconstructed Ir(100) Surfaces from UHV to mbar Pressure: A LEED, TPD, and PM-IRAS Study
The Journal of Physical Chemistry C. 2016. V.120. N20. P.10838-10848. DOI: 10.1021/acs.jpcc.5b12494 WOS Scopus РИНЦ
Files:
Full text from publisher
Dates:
Submitted: | Dec 21, 2015 |
Accepted: | Apr 21, 2016 |
Published online: | May 17, 2016 |
Published print: | May 26, 2016 |
Identifiers:
Web of science | WOS:000376840900011 |
Scopus | 2-s2.0-84971383923 |
Elibrary | 27060591 |
Chemical Abstracts | 2016:646826 |
Chemical Abstracts (print) | 164:563708 |
PMID | 27257467 |
OpenAlex | W2336035267 |