Photoemission study of Pt adlayers on Ni(111)

Roméo, M.; Majerus, J. N.; Légaré, P.; Castellani, Norberto J.; Leroy, D. B.

doi:10.1016/0039-6028(90)90073-h

Cited by 54 publications

(22 citation statements)

References 17 publications

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“…In addition, the binding energy of Pt 4f 5/2 and Pt 4f 7/2 were 74.83 eV and 71.42 eV, respectively. These binding energies are higher than previously reported values for pure metallic Pt (74.23–74.40 for Pt 4f5/2 and 70.87−71.10 eV for Pt 4f7/2) . This shows that there is a strong synergetic effect between these metals and their properties can easily be tuned.…”

contrasting

confidence: 59%

Ultra-small Tetrametallic Pt-Pd-Rh-Ag Nanoframes with Tunable Behavior for Direct Formic Acid/Methanol Oxidation

Saleem

Yang

et al. 2016

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Reversible tuning of ultra-small multimetallic Pt-Pd-Rh-Ag nanoframes is achieved. These nanoframes showed tunable and reversible modes for the oxidation of small organic molecules by simply inducing segregation with adsorbates, such as SO and OH . This is the first example of reversible segregation under electrocatalytic conditions in atomic-sized electrocatalysts. These nanoframes also showed a controllable activity and good stability for the oxidation of small organic molecules.

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contrasting

confidence: 59%

Ultra-small Tetrametallic Pt-Pd-Rh-Ag Nanoframes with Tunable Behavior for Direct Formic Acid/Methanol Oxidation

Saleem

Yang

et al. 2016

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“…The photoemission data (P. L6gar6, unpublished) for submonolayer coverages of Pt on Ni(l11) show evolution of a wide Pt d band with the LDOS maximum at 4.5 eV below E,, which correlates more or less with our EP LDOS. The experiment for Pt 4f levels in the Pt coverage range 0.14-1.68 [7] gives an almost constant CLS of about 0.1 eV. According to our results, this value might correspond to not fully coordinated Pt adatoms in the EP model.…”

Section: Resultssupporting

confidence: 55%

Hydrogen chemisorption on Pt/Ni (111) systems

Mikušík

Pick

Castellani³

et al. 1996

Int. J. Quantum Chem.

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m Extensive self-consistent real-space recursion-method calculations were performed for the Pt overlayer or the Pt, cluster on the Ni(ll1) surface and for hydrogen chemisorption on these systems. Correlations between the surface-atom local density of electronic-state properties before chemisorption, surface reactivity, and the initial-state contribution to the metal core-level shifts, respectively, is documented and discussed. The experimentally observed catalytic properties of Pt-Ni alloy surfaces are also briefly considered. o 1996 John Wiley & Sons, Inc.one finds the family of Pt-Ni alloys with the fcc lattice. It is known that for any bulk Pt concentration the (111) surface is essentially enriched by platinum, forming a quasi-pure platinum overlayer if the bulk Pt content is about 50% or more 11-31. The subsurface layer is, on the contrary, enriched by Ni. The surface reactivity is strongly influenced by the alloying: The hydrogen-metal bond is reduced at the (111) face, especially for the cur for adsorption of CO and hydrocarbons [l, 21. Pto.,Ni 0.5 stoichiometry 141; analogous effects oc-Octubre 1842,

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“…They pointed out the importance of the d-band position on the adsorption properties. In a previous work, we studied the growth of Pt thin layers on Ni(111) [5] and Co(0001) [6]. The growth of monatomic-thick Pt islands on Co(0001) was observed by scanning tunneling microscopy (STM) [6].…”

Section: Introductionmentioning

confidence: 99%

CO Adsorption on Co(0001)-Supported Pt Overlayers

Légaré

Madani

Cabeza

et al. 2001

IJMS

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the growth of Pt deposits on Co(0001) was followed by STM and XPS. The chemical reactivity of the resulting surface was checked by CO adsorption. Pt grows as dendritic islands on the Co terraces whereas forming stripes at the Co step edges.Annealing the sample has no apparent effect on the STM pictures. However, XPS suggests that a limited dilution of Pt in Co takes place. The adsorption of CO on the surface is drastically affected by the presence of Pt even for minute traces. The adsorption energy on the Pt areas is decreased by 40 %. The maximum coverage on the Co areas is also decreased. This indicates that Pt impurities diluted in Co have a high passivating power as a consequence of the induced electronic changes.

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Photoemission study of Pt adlayers on Ni(111)

Cited by 54 publications

References 17 publications

Ultra-small Tetrametallic Pt-Pd-Rh-Ag Nanoframes with Tunable Behavior for Direct Formic Acid/Methanol Oxidation

Ultra-small Tetrametallic Pt-Pd-Rh-Ag Nanoframes with Tunable Behavior for Direct Formic Acid/Methanol Oxidation

Hydrogen chemisorption on Pt/Ni (111) systems

CO Adsorption on Co(0001)-Supported Pt Overlayers

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