On the electronic structure of surface Pt–Sn alloys

Pick, Štěpán

doi:10.1016/s0039-6028(99)00667-6

Cited by 48 publications

(28 citation statements)

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“…This barrier is almost twice that on Pt(111) [15]. This huge increase in the C-H bond breaking barrier is due either to the general decrease in the LDOS at the Fermi energy at Pt atoms as caused by alloying Sn to Pt(111) [48] or perhaps to a loss of the specific surface electronic structure at pure-Pt threefold sites due to the loss of these sites on this alloy surface.…”

Section: Discussionmentioning

confidence: 97%

Reactivity of Ethyl Groups on a Sn/Pt(111) Surface Alloy

Zhao

Koel

2005

Catal Lett

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In order to probe the thermal stability and reactivity of ethyl intermediates on Pt-Sn alloy catalysts, we have synthesized these species by reaction of H atoms with adsorbed ethylene on a ( ffiffi ffi (111) surface alloy. Adsorbed ethyl groups are stable until 376 K where they react to evolve ethane, ethylene, and H 2 . The activation energy for ethyl dehydrogenation is E dehyd Ã ¼ 97 kJ/mol, which is twice that reported on Pt(111). In addition, we place a lower limit of E hydr * > 70 kJ/mol on the barrier to ethyl hydrogenation on this alloy.

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Section: Discussionmentioning

confidence: 97%

Reactivity of Ethyl Groups on a Sn/Pt(111) Surface Alloy

Zhao

Koel

2005

Catal Lett

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“…[50][51][52] In alloys between a transition metal and a main group element, such as Pt 3 Sn, Ni 3 Al, Mo 2 C, and Ni 2 P, the bonding is metallic, but with strong covalent and ionic contributions, and again STM images show the preferential enhancement of one of the components. In Pt 3 Sn there is a deep dip in the total LDOS at E F in both the bulk 53 and in the (111) surface, 54 with the LDOS of Sn at E F being virtually zero at the Pt 3 Sn(111) surface. 54 As a result, Sn atoms appear as dark spots in the range of ±0.1-0.9 eV.…”

Section: Stm Image Formation Of Ni 2 P Surfacesmentioning

confidence: 98%

Scanning Tunneling Microscopy and Photoemission Electron Microscopy Studies on Single Crystal Ni<SUB>2</SUB>P Surfaces

Suzuki

Moula²,

Miyamoto³

et al. 2009

J. Nanosci. Nanotech.

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The surface structures of nickel phosphide (Ni2P) single crystals were studied by scanning tunneling microscopy (STM) and photoemission electron microscopy (PEEM). Atomically resolved 1 x 1 images of the Ni2P(0001) and (1010) surfaces are successfully obtained with STM, whose respective dimensions of (0.59 nm x 0.59 nm) and (0.34 nm x 0.59 nm) match the unit cell lengths. The Ni2P(0001) surface has two possible terminations in which the Ni:P ratios are 3:1 (Ni3P termination) or 3:2 (Ni3P2 termination). In the Ni3P terminated surface the Ni atoms have a square pyramidal structure, and in the Ni3P2 terminated surface the Ni atoms have a tetrahedral structure. Only the P is visible in the STM for Ni2P(0001) and this is explained as being due to the greater extension of the phosphorus p orbitals than the Ni d orbitals at the surface. The surface domain sizes of the Ni3P and Ni3P2 termination structures of Ni2P(0001) are determined to be 500 microm by means of PEEM using a Hg-Xe lamp through a low-pass UV-filter. Evidence is found for dissociative adsorbed hydrogen on the Ni3P termination surface of Ni2P(0001), but not on the Ni3P2 surface, indicating that the square pyramidal sites on the Ni3P surface have high reactivity.

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“…adsorbed OH) generated by the dissociation of water, which are necessary to oxidize completely the intermediate species from the dissociation of ethanol to CO 2 . At present, there are only a limited number of possible metals which are able to activate water at a low potential with a sufficient stability in acid medium, including Ru [10,12,13], Mo [14,15], Sn [16,17], Os [18], W [19], Ir [20], and so on. PtRu alloys, which have been widely used as catalysts in DMFCs, are still considered to be the best starting point in DEFC research, but their practical use as catalysts for ethanol electrooxidation requires some significant enhancements to the catalytic activities [21].…”

Section: Introductionmentioning

confidence: 99%