The stationary oxidation of rhenium in the presence of platinum atoms: A mass spectrometry study under low oxygen pressures

Mesboua, N.; Wéber, B.; Cassuto, A.

doi:10.1016/0039-6028(90)90204-l

Cited by 1 publication

(1 citation statement)

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“…Surface sensitive studies in controlled ultra-high vacuum (UHV) environments have been used to better understand the interaction between Pt and Re using model systems on single crystal and foil surfaces [8][9][10][11][12][13][14][15][16][17]. Bimetallic systems have been prepared on flat samples by evaporation of Pt on Re(0001) [11][12][13], by evaporation of Pt on Re foil [10,18,19], by evaporation of Re on Pt foil [16], and by evaporation of Re on Pt(111) [8,9,[12][13][14][15]17] and Pt(100) [12]. The resulting surfaces have been subjected to a variety of treatments including heating, oxidation, and exposure to small probe molecules.…”

Section: Introductionmentioning

confidence: 99%

Characterization and theory of Re films on Pt(111) grown by UHV-CVD

Detwiler

Majumdar

et al. 2015

Surface Science

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a b s t r a c t a r t i c l e i n f o Available online xxxx Keywords: XPS HREELS DFT Bimetallic catalyst Oxygen adsorption CO adsorptionChanges in surface chemistry and morphology of Re-Pt surfaces synthesized by ultra-high vacuum chemical vapor deposition (UHV-CVD) of Re on Pt(111) were studied by a combination of experiment and density functional theory (DFT) modeling. A Re oxide formed following exposure of the as-deposited Re to 1 × 10 −6 mbar oxygen at 600-673 K. Subsequent annealing at 973 K resulted in oxygen desorption and a decrease in Re coverage, as calculated by XPS and as observed by STM. This observation was explained by DFT calculations which showed that a clean Pt surface slab with subsurface Re is thermodynamically more favorable than Pt (111) with Re on the surface. DFT calculations also predicted weaker O and CO binding on this surface compared to both monometallic Pt and Re, and HREELS and temperature desorption measurements suggested that O binds weakly to the Pt skin surface, with oxygen on the Pt skin desorbing from this surface following annealing at 373 K. Trends in adsorption energies were consistent with DFT calculated d-band centers of surface atoms for model Pt-Re structures. Comparison of HREELS data and STM images with DFT calculated vibrational frequencies have been used to understand the structure of rhenium oxide on Pt(111).

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