On the global and local values of the potential of zero total charge at well-defined platinum surfaces: stepped and adatom modified surfaces

Attard, Gary Anthony; Hazzazi, Omar A.; Wells, Peter B.; Climent, Vı́ctor; Herrero, Enrique; Feliu, Juan M.

doi:10.1016/j.jelechem.2004.02.007

Cited by 60 publications

(47 citation statements)

References 54 publications

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“…In the presence of CO ad at low potentials (in the hydrogen region), Ni UPD /Pt(1 1 0)-(1 × 2) is probably free of water/anions adsorbate, following its potential of zero charge positive shift (or CO-induced displacement), as documented in references [39][40][41]. Upon potential increase starting from Ni and CO deposition potential (−0.005 V versus NHE), Ni UPD adatoms may nucleate water (OH ad species) at potentials negative to platinum (Eq.…”

Section: Discussionmentioning

confidence: 92%

Understanding CO-stripping mechanism from NiUPD/Pt(110) in view of the measured nickel formal partial charge number upon underpotential deposition on platinum surfaces in sulphate media

Chatenet

Soldo-Olivier

Chaînet

et al. 2007

Electrochimica Acta

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Section: Discussionmentioning

confidence: 92%

Understanding CO-stripping mechanism from NiUPD/Pt(110) in view of the measured nickel formal partial charge number upon underpotential deposition on platinum surfaces in sulphate media

Chatenet

Soldo-Olivier

Chaînet

et al. 2007

Electrochimica Acta

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“…24 On the other hand, the measurements of the potential of zero total charge for the stepped surfaces indicate that the local potential of zero total charge for the step is located in the middle of the peak. 30,31 All these experiments suggest that the 55 peaks correspond to the competitive adsorption process between H, OH and possibly O. Additionally, the observed irreversibility of the peak for the (100) step can be also associated with the adsorption process of OH or O process since hydrogen adsorption is generally very fast. 25, 32, 33 60 The behavior of (100) stepped surfaces has been described extensively in a previous report.…”

Section: Ljs Notation Miller Indicesmentioning

confidence: 95%

Oxygen reduction reaction on stepped platinum surfaces in alkaline media

Rizo

Herrero

Feliu

2013

Phys. Chem. Chem. Phys.

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110

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The oxygen reduction reaction (ORR) in 0.1 M NaOH on platinum single crystal electrodes has been studied using hanging meniscus rotating disk electrode configuration. Basal planes and stepped surfaces with (111) and (100) terraces have been employed. The results indicate that the Pt(111) electrode has the highest electrocatalytic activity of all the studied surfaces. The addition of steps on this electrode surface diminishes significantly the reactivity of the surface towards the ORR. In fact, the reactivity of the steps 10 for the surfaces with wide terraces can be considered negligible with respect to that measured for the terrace. On the other hand, Pt(100) and Pt(110) electrodes have much lower activity than the Pt(111) electrode. These results have been compared with those obtained in acid media to understand the role of the pH and the adsorbed OH on the mechanism. It is proposed that the surface covered by adsorbed OH is active for the reduction of the oxygen molecules.

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“…Such delicate sensitivity of the surface structure to the treatment conditions is probably the main reason for the difficulty in understanding the charge transfer processes involved in the voltammetric response from stepped surfaces vicinal to the (100) pole. These surfaces were characterized from the point of view of electric charge density measurements, in acidic media [8][9][10]. The reported results revealed that the hydrogen coverage on terraces appears to be slightly lower than that corresponding to one electron per terrace site while the charge measured in the lower potential range (below 0.2V, assigned to hydrogen adsorption on (111) defects) was larger than that expected for well-ordered surfaces [8].…”

Section: Introductionmentioning

confidence: 94%

On the behavior of the Pt(100) and vicinal surfaces in alkaline media

Arán‐Ais

Figueiredo

Vidal‐Iglesias

et al. 2011

Electrochimica Acta

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Abstract:We address in this paper a voltammetric study of the charge transfer processes characteristic of Pt(100) and vicinal surfaces in alkaline media. The electrochemical behavior of a series of stepped surfaces of the type Pt(S)[n(100)×(111)] has been characterized using cyclic voltammetry at different pHs, charge displacement measurements and FTIR experiments for adsorbed CO. The results from these techniques allow assigning the different peaks appearing in the voltammogram to hydrogen and /or OH adsorption on the different sites characteristic of these surfaces, namely, terrace and step sites. Additionally, the potential of zero total charge (pztc) of the electrodes was also determined. The resulting pztc values shift to more negative values when the step density increases on the surface up to n=5. FTIR spectroscopy experiments have been used to monitor the adsorption of CO on the different surfaces as well as the consequent CO oxidation, accompanying a positive potential sweep. The oxidation of adsorbed CO on (100) terraces is catalyzed by the presence of the (111) steps. The FTIR spectra revealed that CO is mostly bonded in bridge configuration at low potentials interconverting to on-top when the electrode potential is increased.

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On the global and local values of the potential of zero total charge at well-defined platinum surfaces: stepped and adatom modified surfaces

Cited by 60 publications

References 54 publications

Understanding CO-stripping mechanism from NiUPD/Pt(110) in view of the measured nickel formal partial charge number upon underpotential deposition on platinum surfaces in sulphate media

Understanding CO-stripping mechanism from NiUPD/Pt(110) in view of the measured nickel formal partial charge number upon underpotential deposition on platinum surfaces in sulphate media

Oxygen reduction reaction on stepped platinum surfaces in alkaline media

On the behavior of the Pt(100) and vicinal surfaces in alkaline media

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