Adsorption of O and CO on Ir(100) from first principles |
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Authors: | I A Erikat B A Hamad and J M Khalifeh |
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Institution: | (1) Department of Physics, University of Jordan, Amman, 11942, Jordan |
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Abstract: | The adsorption of O and CO on Iridium (100) surface with different coverages (Θ = 1.0, 0.5, 0.25 monolayer (ML)) is studied
using density functional theory (DFT). The most energetically preferred site of adsorption for O is found to be the bridge
site. However, the top site is the preferred one for CO at coverages of 0.25 ML and 0.5 ML. Oxygen adsorbed on the bridge
site at 0.25 ML and 0.5 ML coverages causes a row pairing. A missing row reconstruction appears in the case of 0.25 ML coverage.
We find that the adsorption of O (CO) on Ir(100) surface causes disruptions of Ir–Ir bonds in the metal, which reduces (increases)
the Ir–Ir bond length. |
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Keywords: | PACS" target="_blank">PACS 81 65 Mq Oxidation 82 45 Jn Surface structure reactivity and catalysis 82 65 +r Surface and interface chemistry heterogeneous catalysis at surfaces |
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