In-situ STM characterisation of the surface morphology of platinum single crystal electrodes as a function of their preparation

Kibler, Ludwig A.; Cuesta, Ángel; Kleinert, M; Kolb, Dieter M.

doi:10.1016/s0022-0728(00)00065-6

Cited by 224 publications

(233 citation statements)

References 41 publications

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“…This reconstruction is lifted during the cooling of the electrode in the H 2 atmosphere, which leads to a significant amount of defects formed in the surface, as STM results demonstrate [63,64]. In spite of the higher number of defects present on this electrode with respect to the Pt(111) electrode, the preparation conditions and number of defects have a very small effect on the electrochemical behavior of this electrode.…”

Section: Discussionmentioning

confidence: 96%

On the electrochemical properties of platinum stepped surfaces vicinal to the (100) pole. A computational study

Ferre-Vilaplana

Gisbert

Herrero

2014

Electrochimica Acta

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Please cite this article as: Adolfo Ferre-VilaplanaRuben GisbertEnrique Herrero On the electrochemical properties of platinum stepped surfaces vicinal to the (100) pole. A computational study (2014), http://dx.doi.org/10.1016/j.electacta. 2014.01.138 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Abstract.DFT studies on platinum stepped surfaces have been carried out in order to understand the differences in the electrochemical behavior between the surfaces with (111) and (100) terraces. Thus, adsorption energies of different species on selected surfaces have been computed. For the adsorption of Bi and Cu on the Pt(553) and Pt(711) surfaces, it has been found that that the adsorption energy on the site corresponding to the step decoration for the Pt(553) surface is ca. 0.5 eV higher than that calculated on the (111) terrace sites. On the other hand, there is no preferential adsorption site for Cu or Bi on the Pt(711) surface, since the energy differences between the different sites on this stepped surface with (100) terraces are very small. CO and OH adsorption on the surface with (100) terraces, namely the Pt(100), the Pt(711) and the Pt(510) surfaces, have been also investigated. The energy differences between step sites and terrace sites for both surfaces is very small, ca. 0.2 eV for OH adsorption and <0.1 eV for CO adsorption. For OH, the preferred adsorption mode is a bridge mode, whereas the adsorption energy for the on top and bridge configurations of CO are similar on those surfaces. The comparison with previous DFT calculations indicates that the Page 2 of 29 A c c e p t e d M a n u s c r i p t 2 perturbation created by the step on the (100) terrace is significantly smaller than that created on the (111) terraces. Thus, the modification of the electrochemical properties produced by the presence of a step in the (100) terrace is minor, in agreement with the experimental results.

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Section: Discussionmentioning

confidence: 96%

On the electrochemical properties of platinum stepped surfaces vicinal to the (100) pole. A computational study

Ferre-Vilaplana

Gisbert

Herrero

2014

Electrochimica Acta

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“…Likely mixtures of both types of domains exist on the surface in all cases. In this respect STM studies have not been able to characterize the Pt(110)/ solution interface [53]. In this later study, it was suggested that the cooling in CO atmosphere leads to better ordered surfaces.…”

Section: Oxidation Of Formic Acid On Pt(110) Modified Electrodesmentioning

confidence: 96%

Fundamental aspects of HCOOH oxidation at platinum single crystal surfaces with basal orientations and modified by irreversibly adsorbed adatoms

Boronat-González

Herrero

Feliu

2013

J Solid State Electrochem

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Abstract.Oxidation of formic acid at Pt(hkl) electrodes with basal orientations and modified by irreversibly adsorbed adatoms is revisited. It was shown that the adatoms of the nitrogen group could enhance the electrocatalytic activity through long range electronic effects in the case of Pt (111) substrates or through shorter third body effects when adsorbed at Pt(100) electrodes. In both cases it appears that free platinum sites were required. Special attention is given here to the reactivity at Pt(110) substrates. It is found that maximum electrocatalysis is observed at fully blocked surfaces. This result points out again structure sensitivity effects for this characteristic reaction. Unlike the more compact planes, in which the enhancement of the oxidation rate was explained through essentially rigid models for the adlayer, it is suggested that the resulting enhancement observed at Pt(110) substrates could be explained if some adatom mobility is considered.

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“…However, experimental surfaces, even the most carefully 20 prepared and characterized, always contain defects at atomic level. Hence, theoretical results are only possible to compare with samples fulfilling some quality criteria [19-22], usually not found in results coming from large commercial materials [23].…”

Section: Introductionmentioning

confidence: 99%

Oxygen reduction on nanostructured platinum surfaces in acidic media: Promoting effect of surface steps and ideal response of Pt(1 1 1)

Gómez–Marín

Feliu

2015

Catalysis Today

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Abstract:In this paper, the role of surface steps on the electrocatalytic activity of Platinum nano-10 structured surfaces for the oxygen reduction reaction (ORR) in acidic medium is evaluated by using stepped surfaces of structure Pt(S)[n(111)x (111)] with large terraces (20 ≤ n ≤ 50). It is realized that the inclusion of an even low amount of surface steps enhances the ORR, and linear activity trends are measured when currents at constant potential are plotted vs. the step density. As a consequence, an ideal ORR curve for a 15 defect-free Pt(111) surface is extrapolated at zero defect density from experimental data and can be compared to that of a quasi perfect Pt(111) electrode. It is clearly shown that surface steps promote the electrode activity toward ORR in acid medium. Results are discussed in light of available theoretical and experimental data.

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In-situ STM characterisation of the surface morphology of platinum single crystal electrodes as a function of their preparation

Cited by 224 publications

References 41 publications

On the electrochemical properties of platinum stepped surfaces vicinal to the (100) pole. A computational study

On the electrochemical properties of platinum stepped surfaces vicinal to the (100) pole. A computational study

Fundamental aspects of HCOOH oxidation at platinum single crystal surfaces with basal orientations and modified by irreversibly adsorbed adatoms

Oxygen reduction on nanostructured platinum surfaces in acidic media: Promoting effect of surface steps and ideal response of Pt(1 1 1)

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