CO adsorption and oxidation on bimetallic Pt/Ru(0001) surfaces – a combined STM and TPD/TPR study

Mongeot, F. Buatier de; Scherer, M.; Gleich, B.; Kopatzki, E.; Behm, R. J.

doi:10.1016/s0039-6028(98)00286-6

Cited by 249 publications

(244 citation statements)

References 34 publications

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“…No change in the reciprocal lattice distance of the diffraction spots was observed, so that this possibility can be ruled out. The formation of a PtRu surface alloy was, however, observed after deposition of 0.4 ML of Pt onto Ru(0001) at 310 K followed by annealing at 1200 K [17]. RHEED was, for example, also able to detect the formation of a surface alloy of Cu/Au(111) associated with an 3%-4% increase of the reciprocal lattice separations between the Au substrate reflections [18].…”

Section: Resultsmentioning

confidence: 99%

Spontaneous and Electrodeposition of Pt on Ru(0001)

Zei

Lei

Ertl

2003

Zeitschrift Für Physikalische Chemie

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Ruthenium / Spontaneous Pt Deposition / Methanol Electrooxidation / RHEED / SEMPt was deposited onto a Ru(0001) electrode from a PtCl 6 2− -containing HClO 4 solution either electrochemically or spontaneously (i.e. without external current flow). Composition, structure and morphology of the deposit were studied by means of Auger electron spectroscopy (AES), high energy electron diffraction (RHEED), and scanning electron microscopy (SEM). At first pseudomorphic growth of a 2D-Pt adlayer takes place, while with higher coverages 3D-clusters develop for which the most densely packed [011]-rows of the Pt(111) planes are parallel with the most densely packed [1120]-rows of the Ru(0001) substrate. These Ptclusters exhibit typical diameters between 2 and 10 nm, while their average mutual separation varies with the total amount of deposit. If compared with the bare Ru(0001) surface, the samples with Pt deposits exhibit considerably enhanced activity with respect to electrooxidation of formic acid or methanol.

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Section: Resultsmentioning

confidence: 99%

Spontaneous and Electrodeposition of Pt on Ru(0001)

Zei

Lei

Ertl

2003

Zeitschrift Für Physikalische Chemie

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“…Both lead to a downshift of the dband center and hence to a destabilization of metal adsorbate bond, which has been also observed experimentally. [6,14,21,22] Schlapka et al could demonstrate by an elegant combination of experiment and theory that the electronic interaction with the substrate has a stronger influence than the strain effects for CO adsorption on a Pt monolayer film. [22] Similar results were also obtained recently for H and OH adsorption on Pt/Ru(0001) surfaces.…”

Section: Discussionmentioning

confidence: 99%

“…[6,16,20] With increasing temperature, the islands grow in size and are transformed to a compact shape after annealing to higher temperatures (~700 K). [6,16,19,20] The onset of surface alloy formation at the descending edges of vacancy islands in Pt monolayer films was observed after annealing to 850 K, [16] while surface alloy formation is completed after annealing to 1300 K. [13,16] Herein, we present the results of a combined STM and spectroscopic study on the correlation between structural variations in bimetallic PtRu/Ru(0001) surfaces during the surface alloy formation process and the corresponding modifications in their chemical properties. The surface structure and distribution of the components in the topmost layer was revealed by STM.…”

Section: Introductionmentioning

confidence: 99%

From Adlayer Islands to Surface Alloy: Structural and Chemical Changes on Bimetallic PtRu/Ru(0001) Surfaces

et al. 2010

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The correlation between structural and chemical properties of bimetallic PtRu/Ru(0001) model catalysts and their modification upon stepwise annealing of a submonolayer Pt‐covered Ru(0001) surface up to the formation of an equilibrated PtxRu1−x/Ru(0001) monolayer surface alloy was investigated by scanning tunneling microscopy and by the adsorption of CO and D2 probe molecules. Both temperature‐programmed desorption and IR measurements demonstrate the influence of the surface structure on the adsorption properties of the bimetallic surface, which can be explained by changes of the composition of the adsorption ensembles (ensemble effects) for D adsorption and by changes in the electronic interaction (ligand effects, strain effects) of the metallic constituents for CO and D adsorption upon alloy formation.

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“…36 2 H adsorption in (3 Â 3) and (3 Â 4) unit cells. In a third step we calculated the adsorption energies for adsorption of 2 H atoms per ensemble for Pd [1][2][3][4] ensembles, again mostly in a (3 Â 3) unit cell, to include the effect of pairwise adsorption discussed above (Fig. 10).…”

Section: Theoretical Description Of the Interaction Of Hydrogenmentioning

confidence: 99%

“…1 The level of insight gained from these model studies has increased dramatically with the advances in structural characterization, in particular by high resolution scanning tunneling microscopy (STM), e.g., for the resolution and chemical identification of different metal surface atoms [2][3][4] and progress in the theoretical description of adsorbates and surface reactions. [5][6][7][8] Using tailored nanostructured surfaces with well known concentrations of individual structural elements ('nanostructures'), one ultimately aims at a qualitative and quantitative understanding of the chemical and catalytic properties of these nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen adsorption on bimetallic PdAu(111) surface alloys: minimum adsorption ensemble, ligand and ensemble effects, and ensemble confinement

Takehiro

Liu

Bergbreiter

et al. 2014

Phys. Chem. Chem. Phys.

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The adsorption of hydrogen on structurally well defined PdAu-Pd(111) monolayer surface alloys was investigated in a combined experimental and theoretical study, aiming at a quantitative understanding of the adsorption and desorption properties of individual PdAu nanostructures. Combining the structural information obtained by high resolution scanning tunneling microscopy (STM), in particular on the abundance of specific adsorption ensembles at different Pd surface concentrations, with information on the adsorption properties derived from temperature programmed desorption (TPD) spectroscopy and high resolution electron energy loss spectroscopy (HREELS) provides conclusions on the minimum ensemble size for dissociative adsorption of hydrogen and on the adsorption energies on different sites active for adsorption. Density functional theory (DFT) based calculations give detailed insight into the physical effects underlying the observed adsorption behavior. Consequences of these findings for the understanding of hydrogen adsorption on bimetallic surfaces in general are discussed.

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CO adsorption and oxidation on bimetallic Pt/Ru(0001) surfaces – a combined STM and TPD/TPR study

Cited by 249 publications

References 34 publications

Spontaneous and Electrodeposition of Pt on Ru(0001)

Spontaneous and Electrodeposition of Pt on Ru(0001)

From Adlayer Islands to Surface Alloy: Structural and Chemical Changes on Bimetallic PtRu/Ru(0001) Surfaces

Hydrogen adsorption on bimetallic PdAu(111) surface alloys: minimum adsorption ensemble, ligand and ensemble effects, and ensemble confinement

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