Quantitative analysis of the distribution of the hydrogen adsorption states at platinum surfaces

Armand, D.; Clavilier, J.

doi:10.1016/0022-0728(87)85020-9

Cited by 69 publications

(37 citation statements)

References 8 publications

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“…These results indicate that Sn may not be irreversibly adsorbed on Pt(1 1 0) surface under present conditions. It is well-known [22][23][24] that the surface of Pt(1 1 0) is readily reconstructed into a (1 × 2) structure under electrochemical conditions. Two models for the Pt(1 1 0)-(1 × 2) structure are generally accepted.…”

Section: Resultsmentioning

confidence: 99%

Irreversible adsorption of Sn adatoms on basal planes of Pt single crystal and its impact on electrooxidation of ethanol

Zheng¹,

Chunjie²,

Zhang³

et al. 2008

Electrochimica Acta

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Section: Resultsmentioning

confidence: 99%

Irreversible adsorption of Sn adatoms on basal planes of Pt single crystal and its impact on electrooxidation of ethanol

Zheng¹,

Chunjie²,

Zhang³

et al. 2008

Electrochimica Acta

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“…At this moment, and lacking detailed structural information of the CO adlayer obtained, for example, using scanning tunneling microscopy (STM), we cannot speculate further regarding the nature of the twofold sites yielding this CO stretching band and the difference between them and those yielding the low-frequency tail of this band and the band around 1842 cm À1 appearing in CO-free solutions. The current appearing at E < 0.20 V in the CV of Pt(1 0 0) electrodes in sulphuric or perchloric acid solutions has been attributed to hydrogen adsorption/desorption on (1 1 1)-step sites, while the current appearing at E > 0.20 V has been attributed to the concomitant adsorption (desorption) of 1 ML of hydrogen and desorption (adsorption) of anions on (1 0 0) terraces [22][23][24][25]. As already noted by Domke et al [24], the charge assumedly corresponding to 1 ML hydrogen adsorption on (1 0 0) terraces, obtained from CO-charge displacement measurements at 0.20 V, is about 15% less than the theoretical value of 208 lC cm À2 , corresponding to one electron per site on a perfect Pt(1 0 0) surface.…”

Section: Highest Co Coverage In Co-saturated and Co-free Solutionsmentioning

confidence: 96%

Potential dependence of the saturation CO coverage of Pt electrodes: The origin of the pre-peak in CO-stripping voltammograms. Part 2: Pt(100)

López-Cudero

Cuesta

Gutiérrez

2006

Journal of Electroanalytical Chemistry

105

132

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As in previous work with Pt(1 1 1) electrodes, we have combined CO-stripping cyclic voltammetry, CO charge-displacement and FT-IR spectroscopy measurements to determine changes in the coverage and structure of CO adlayers on Pt(1 0 0) electrodes in 0.1 M H 2 SO 4 as a function of potential. In CO-free solutions the maximum coverage is h CO = 0.79, which can only be reached if the potential at which the electrode is held during CO adsorption (dosing potential, E d ) is more negative than 0.25 V vs. RHE. Although the highest CO coverage of Pt(1 0 0) electrodes in contact with CO-saturated solutions could not be determined, our FT-IR results clearly show that, as in the case of Pt(1 1 1) electrodes, removing CO from the solution results in a partial, reversible desorption of the CO adlayer, and, hence, that the CO adlayer on the Pt(1 0 0) electrode is in equilibrium with the CO-containing solution. The lowest CO coverage at which hydrogen adsorption on the Pt(1 0 0) electrode is completely blocked is h CO = 0.75, which corresponds to E d = 0.40 V vs. RHE. The results reported here provide support to the hypothesis that the process at the pre-peak in CO-stripping voltammograms (and, hence, the oxidation at low overpotentials of bulk CO in CO-saturated solutions), corresponds to the oxidation of CO by reaction with oxygenated species nucleating at steps, the main CO-oxidation peak appearing when nucleation of oxygenated species at the terraces also occurs.

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“…On the basis of a mathematical treatment proposed by Armand and Clavilier, 40,41 the Cu UPD voltammetric response can be described by a Frumkin-Fowler isotherm that yields symmetrical voltammetric peaks. These symmetrical peaks are very well represented by the Gaussian equations used by the deconvolution program included in the Origin software.…”

Section: Voltammetric Analysismentioning

confidence: 99%

A microgravimetric study of simultaneous adsorption of anions and copper on polycrystalline Pt surfaces

Miwa¹,

Santos²,

Machado³

2006

J. Braz. Chem. Soc.

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A deposição em subtensão de Cu foi estudada em quatro diferentes eletrólitos ácidos, por meio de medidas simultâneas de voltametria cíclica e microgravimetria, usando uma microbalança eletroquímica de cristal de quartzo. A influência dos ânions na formação da monocamada de Cu foi determinada. Entre os três picos de dessorção observados, encontrou-se que o primeiro é muito sensível à natureza do anion presente em solução. Este comportamento foi relacionado com o baixo recobrimento da superfície da Pt com os ad-átomos, na faixa de potenciais correspondente, que resulta apenas em interações muito fracas entre os ad-átomos de Cu. A monocamada é composta de uma primeira camada de Cu adsorvido sobre Pt e uma segunda camada de ânions adsorvidos sobre os ad-átomos de Cu, com cada ânion ocupando dois ad-átomos adjacentes, com exceção do Cl -, que se depositou na forma de um ânion para cada ad-átomo de Cu. Esta estrutura forma, conseqüentemente, uma bi-camada. A modificação dos perfis dos massogramas e voltamogramas pelo acréscimo do Cl -no eletrólito de perclorato também foi analisada.The underpotential deposition of Cu was studied in four different acid electrolytes by simultaneous measurements of cyclic voltammetry and microgravimetry using a electrochemical quartz crystal microbalance. The influence of anions on the Cu monolayer was determined. Among the three desorption peaks observed, the first was found to be very sensitive to the nature of the anion present in solution. This was related to the low coverage of the Pt surface by ad-atoms, in the respective potential range, which yields a weak interaction between the Cu adatoms. The monolayer is composed of a first layer of Cu adsorbed on Pt and a second layer of anions adsorbed on the Cu ad-atoms, with each anion occupying two adjacent Cu atoms, with the exception of the Cl -anion which was deposited on only one Cu ad-atom. This structure consequently forms a bi-layer deposit. The modification of voltammetric and massogram profiles by adding Cl -to the perchlorate electrolyte was also analyzed.

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Quantitative analysis of the distribution of the hydrogen adsorption states at platinum surfaces

Cited by 69 publications

References 8 publications

Irreversible adsorption of Sn adatoms on basal planes of Pt single crystal and its impact on electrooxidation of ethanol

Irreversible adsorption of Sn adatoms on basal planes of Pt single crystal and its impact on electrooxidation of ethanol

Potential dependence of the saturation CO coverage of Pt electrodes: The origin of the pre-peak in CO-stripping voltammograms. Part 2: Pt(100)

A microgravimetric study of simultaneous adsorption of anions and copper on polycrystalline Pt surfaces

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