Variation of the potential of zero charge for a silver monolayer deposited onto various noble metal single crystal surfaces

Soliman, Khaled A.; Kibler, Ludwig A.

doi:10.1016/j.electacta.2006.12.070

Cited by 32 publications

(43 citation statements)

References 21 publications

(33 reference statements)

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“…The first Ag monolayer was immediately formed as soon as the crystal was attached to the electrolyte surface at 0.13 V vs. Ag/Ag + , most likely by forming one pseudomorphic (1×1) monolayer. Ag upd on Pd(111) includes the deposition of two monolayers taking place in several steps as was also found on Au(111) and Pt(111) [18]. A current peak for the deposition of the first Ag monolayer appeared at 0.319 V vs. Ag/Ag + .…”

Section: Resultsmentioning

confidence: 87%

“…This indicates that the bulk of the Pd film differs from the bulk of massive Pd(111) and is influenced by the substrate, possibly due to the compressed lattice constant of the Pd underlayers and/or other electronic structure effects. Figure 2 shows a CV for Ag underpotential deposition (upd) on a massive Pd(111) electrode (dotted line) [18]. The first Ag monolayer was immediately formed as soon as the crystal was attached to the electrolyte surface at 0.13 V vs. Ag/Ag + , most likely by forming one pseudomorphic (1×1) monolayer.…”

Section: Resultsmentioning

confidence: 99%

“…The second monolayer is formed at quite small underpotential shifts leading to two peaks at 0.027 and 0.011 V vs. Ag/Ag + . The sharpness of the more positive peak is related to the surface quality [18]; thus, Ag upd CVs can be used to ensure well-ordered and clean electrode surface structures. Figure 2 also shows a CV for Ag upd on a Pd film of 20-ML thickness on Ru(0001) (continuous line).…”

Section: Resultsmentioning

confidence: 99%

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Hydrogen Evolution Electrocatalysis on AgPd(111) Alloys

Pluntke

Kibler

2011

Electrocatal

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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.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Hydrogen Evolution Electrocatalysis on AgPd(111) Alloys

Pluntke

Kibler

2011

Electrocatal

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“…In this approach, UPD is used to reverse the order of the reduction potentials of the two metal precursors (Ag and Pd precursors). The precursor of the more reactive metal (Ag in this case) is quickly reduced to form a Ag UPD layer on the central NC [18][19][20][21][22][23] , which would otherwise be the less favourable metal for reduction without UPD ( Fig. 2i-ii).…”

Section: Principlesmentioning

confidence: 99%

Engineering the architectural diversity of heterogeneous metallic nanocrystals

et al. 2013

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Similar to molecular engineering where structural diversity is used to create more property variations for application explorations, the architectural engineering of heterogeneous metallic nanocrystals (HMNCs) can likewise increase the versatility of metallic nanocrystals (NCs). Here we present a synthesis strategy capable of engineering the architectural diversity of HMNCs through rational and independent programming of every architecture-determining element, that is, the shape and size of the component NCs and their spatial arrangement. The strategy is based on the galvanic replacement reaction of a self-sustaining layer formed by underpotential deposition on a polyhedral NC. The selective deposition of satellite NCs on specific site of the central NC is realized by creating a geometry-dependent heterogeneous electron distribution. This site-selective deposition approach is applicable to central NCs in various polyhedral shapes and sizes. The satellite NCs can further develop their own shape and size through crystal growth kinetics control.

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“…One reason might be the lack of an appropriate surface preparation method that does not require laborious ultrahigh vacuum (UHV) equipment. A simple method to prepare clean and wellordered single-crystal electrode surfaces of reactive metals such as Ag, [34] Pd [35,36] or Ru [37] is inductive heating and cooling under a controlled gas atmosphere. We apply this simple method here to a PtRu(111) single crystal.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Electrochemical Behavior of PtRu(111) Alloy Single‐Crystal Surfaces

2010

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The electrochemical behavior of a PtRu(111) single crystal with 1:1 bulk atomic ratio is investigated for the first time by means of cyclic voltammetry and scanning tunneling microscopy (STM). The electrode surfaces are enriched with either Ru or Pt, depending on the cooling conditions after inductive heating. Analysis of the surfaces by STM shows a typical topography with smooth terraces separated by monoatomic high steps. The voltammetric characterization of PtRu(111) in acid media clearly reveals an altered electrochemical behavior of the Pt and Ru surfaces compared to Pt(111) and Ru(0001), respectively. Systematic changes are observed for hydrogen adsorption and underpotential deposition of copper as test reactions. Based on theoretical calculations in the literature, it is experimentally verified that the Pt-rich and the Ru-rich surfaces of the PtRu(111) single-crystal alloy bind adsorbates such as hydrogen significantly weaker and stronger than the pure single-crystal electrode surfaces. Such changes in surface reactivity can be crucial for electrocatalytic reactions.

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Variation of the potential of zero charge for a silver monolayer deposited onto various noble metal single crystal surfaces

Cited by 32 publications

References 21 publications

Hydrogen Evolution Electrocatalysis on AgPd(111) Alloys

Hydrogen Evolution Electrocatalysis on AgPd(111) Alloys

Engineering the architectural diversity of heterogeneous metallic nanocrystals

Preparation and Electrochemical Behavior of PtRu(111) Alloy Single‐Crystal Surfaces

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