Direct observation of subsurface oxygen on the defects of Pd(100)

Huang, Weixin; Zhai, Runsheng; Bao, Xinhe

doi:10.1016/s0039-6028(99)00820-1

Cited by 9 publications

(2 citation statements)

References 15 publications

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“…Due to the increased reactivity and lattice perturbation at defect sites, it is reasonable to think that O sub formation may be enhanced on a surface with a greater number of defects. On Pd(1 0 0), for example, defects were observed to facilitate the formation of O sub from surface-bound oxygen atoms [22]. Pt, however, has proven to be resistant to O sub formation, with small amounts of O sub formed near step edges after repeated high temperature exposures to O 2 [7].…”

Section: Introductionmentioning

confidence: 99%

Exposure of Pt(5 5 3) and Rh(1 1 1) to atomic and molecular oxygen: do defects enhance subsurface oxygen formation?

Farber

Turano

Oskorep

et al. 2017

J. Phys.: Condens. Matter

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Subsurface oxygen is known to form in transition metals, and is thought to be an important aspect of their ability to catalyze chemical reactions. The formation of subsurface oxygen is not, however, equivalent across all catalytically relevant metals. As a result, it is difficult to predict the stability and ease of the formation of subsurface oxygen in metals, as well as how the absorbed oxygen affects the chemical and physical properties of the metal. In comparing how a stepped platinum surface, Pt(5 5 3), responds to exposure to gas-phase oxygen atoms under ultra-high vacuum conditions to planar Rh(1 1 1), we are able to determine what role, if any, steps have on the capacity of a metal for subsurface oxygen formation. Despite the presence of regular defects, we found that only surface-bound oxygen formed on Pt(5 5 3). Alternatively, on the Rh(1 1 1) surface, oxygen readily absorbed into the selvedge of the metal. These results suggest that defects alone are insufficient for the formation of subsurface oxygen, and the ability of the metal to absorb oxygen is the primary factor in the formation and stabilization of subsurface oxygen.

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Section: Introductionmentioning

confidence: 99%

Exposure of Pt(5 5 3) and Rh(1 1 1) to atomic and molecular oxygen: do defects enhance subsurface oxygen formation?

Farber

Turano

Oskorep

et al. 2017

J. Phys.: Condens. Matter

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“…Oxygen adsorption and desorption on a Pd(100) surface with mesoscopic defects were studied by photoemission electron microscopy (PEEM). On the defect surface, oxygen is adsorbed on the surface and on subsurface sites; while on the perfect Pd(100) surface only surface oxygen is present [8]. On the perfect Pd(100) surface, Nyberg and Uvdal found that oxygen orders in a p(2 × 2) superstructure and the Pd-O stretching frequency has a value of 347 cm −1 [9].…”

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confidence: 99%

Stabilization of the PdIn(111) surface via oxygen adsorption—studied by high−resolution electron energy loss spectroscopy and scanning tunneling microscopy

Franchy

Schmitz

2000

Europhys. Lett.

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At 750 K, the adsorption of oxygen on the PdIn(111) surface was investigated by means of high-resolution electron energy loss spectroscopy (EELS), scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), and Auger electron spectroscopy (AES). At 750 K, the oxygen atoms order in a perfect hexagonal (2 √ 3 × 2 √ 3)R30 • superstructure with a lattice constant of 16 Å. The oxygen atoms are adsorbed on Pd sites showing a vibration mode at 340 cm −1 . The oxygen-covered surface has atomically flat terraces without defects or pin-holes in contrast to the clean surface. The oxygen superstructure induces a stabilization of the first atomic layers of the PdIn(111) surface.

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