Formation, stability and CO adsorption properties of PdAg/Pd(111) surface alloys

Ma, Yunsheng; Bansmann, Joachim; Diemant, Thomas; Behm, R. J.

doi:10.1016/j.susc.2009.02.024

Cited by 48 publications

(99 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental studies on AgPd alloy surfaces also found a tendency for Pd atoms to form isolated monomers [33,37]. We conclude that small Pd ensembles, especially Pd x Pd bulk Fig.…”

Section: Voltammetry Of Agpd(111) Alloyssupporting

confidence: 56%

“…Regarding the atomic distribution, STM studies found a tendency of Pd atoms in a silver surface to form isolated Pd sites, entirely surrounded by Ag atoms [33,37]. Furthermore, we have no indication for H upd .…”

Section: Voltammetry Of Agpd(111) Alloysmentioning

confidence: 51%

“…So far, surface composition and Pd ensemble distribution are based on literature on similar systems [10,26,33,37]. Additional experiments will be performed to evaluate the observed trends.…”

Section: Voltammetry Of Agpd(111) Alloysmentioning

confidence: 99%

See 2 more Smart Citations

Hydrogen Evolution Electrocatalysis on AgPd(111) Alloys

Pluntke

Kibler

2011

Electrocatal

View full text Add to dashboard Cite

Recent studies on AuPd(111) alloy surfaces display unexpected hydrogen evolution reaction activities-a unique activity of AuPd alloys with surface fractions of~20% Pd was found. We investigated if this phenomenon also occurs with AgPd alloys. We first deposited Pd on a Ru (0001) substrate. After annealing, cyclic voltammetry investigations showed the same characteristics as Pd (111) single crystals. During Ag deposition, cyclic voltammetry experiments disclose underpotential deposition of Ag on the Pd film just as on Pd(111). AgPd alloys were formed by further annealing, and strong enrichment of Ag at the surface is observed. Using this approach, we prepared various bulk compositions at a film thickness of 20 monolayers. Most AgPd alloys show a higher electrocatalytic activity than Ag or Pd alone. The activity trends match those seen with AuPd alloys.

show abstract

“…Experimental studies on AgPd alloy surfaces also found a tendency for Pd atoms to form isolated monomers [33,37]. We conclude that small Pd ensembles, especially Pd x Pd bulk Fig.…”

Section: Voltammetry Of Agpd(111) Alloyssupporting

confidence: 56%

Section: Voltammetry Of Agpd(111) Alloysmentioning

confidence: 51%

See 1 more Smart Citation

Hydrogen Evolution Electrocatalysis on AgPd(111) Alloys

Pluntke

Kibler

2011

Electrocatal

View full text Add to dashboard Cite

show abstract

“…beam at a scattering angle of 130°, a step size of 0.2 eV and a dwell time of 0.2 s. The relative atomic sensitivities of each metal were determined by depositing a coverage large enough (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) to completely attenuate the Ti substrate signal in the LEIS experiments. An analysis of the STM images for these films showed that all three had comparable total surface areas [23].…”

Section: Methodsmentioning

confidence: 99%

“…In some cases, each metal facilitates different steps in a reaction mechanism [6][7][8] or provides binding sites for different adsorbates [9,10]. In other cases, electronic interactions between the metals or the creation of new mixed-metal sites give rise to different chemical activity [3,5,[11][12][13][14][15][16][17]. It is therefore important to understand the nature of metal-metal interactions in bimetallic systems.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Pt–Au and Ni–Au Clusters on TiO2(110)

Tenney

Ratliff

et al. 2011

Top Catal

View full text Add to dashboard Cite

The surface composition and properties of PtAu and Ni-Au clusters on TiO 2 (110) have been studied by scanning tunneling microscopy (STM), low energy ion scattering (LEIS) and soft X-ray photoelectron spectroscopy (sXPS). STM studies show that bimetallic clusters are formed during sequential deposition of the two metals, regardless of the order of deposition. At the 2 ML of Au/ 2 ML of Pt or Ni coverages studied here, the second metal contributes to the growth of existing clusters rather than forming new pure metal clusters. LEIS experiments demonstrate that the surfaces of the bimetallic clusters are almost 100%

show abstract

The Adsorption of Oxygen and Coadsorption of CO and Oxygen on Structurally Well‐Defined PdAg Surface Alloys

et al. 2012

View full text Add to dashboard Cite

The dissociative interaction of oxygen with structurally well-defined monolayer Pd(x)Ag(1-x)/Pd(111) surface alloys of different compositions, with well-known distributions of the respective surface atoms (A. K. Engstfeld et al., Phys. Chem. Chem. Phys. 2012, 14, 10754-10761), and the coadsorption of/reaction with CO on oxygen pre-covered surfaces were studied by high-resolution electron energy loss spectroscopy (HREELS) and temperature-programmed desorption/reaction spectroscopy (TPD/TPR). The impact of geometric ensemble effects as well as electronic ligand and strain effects on the adsorption and reaction behaviour of the respective species on the bimetallic surfaces is elucidated and compared with related systems such as CO adsorption on similar surfaces and oxygen adsorption on a Pd(67)Ag(33)(111) bulk alloy surface. The data show a clear dominance of ensemble effects on the oxygen adsorption and CO coadsorption behaviour, with oxygen adsorption limited to threefold-hollow sites on Pd(3) sites, while the combined electronic effects, as evident from modifications in the adsorption and reaction characteristics on the Pd sites, are small.

show abstract

Formation, stability and CO adsorption properties of PdAg/Pd(111) surface alloys

Cited by 48 publications

References 62 publications

Hydrogen Evolution Electrocatalysis on AgPd(111) Alloys

Hydrogen Evolution Electrocatalysis on AgPd(111) Alloys

Characterization of Pt–Au and Ni–Au Clusters on TiO2(110)

The Adsorption of Oxygen and Coadsorption of CO and Oxygen on Structurally Well‐Defined PdAg Surface Alloys

Contact Info

Product

Resources

About