An EQCM study of polyethyleneglycol 8000 adsorption and its coadsorption with Cl− ions on Pt in perchloric acid solutions

Bahena, E.; Méndez, Patricio F.; Meas, Y.; Ortega, R.; Salgado, Leonardo; Trejo, G.

doi:10.1016/j.electacta.2003.10.010

Cited by 28 publications

(10 citation statements)

References 22 publications

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“…These EQCM results confirm the previous capacitance measurements. Moreover, in the literature some authors have already shown by other techniques that PEG adsorption is potential dependent [2,5,6,17].…”

Section: Eqcm Measurementsmentioning

confidence: 99%

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Effect of additives on Cu electrodeposits: electrochemical study coupled with EQCM measurements

Eyraud¹,

Kologo²,

Bonou³

et al. 2006

J Electroceram

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The effect of polyethylene glycol (PEG) and chloride ions on Cu electrodeposition mechanism is investigated. Using blank electrolyte, electrochemical measurements show that PEG adsorbs more or less on the electrode surface depending on the nature of this surface (copper, gold). Alternative current techniques and electrochemical quartz crystal microbalance (EQCM) experiments are performed at open circuit and under polarisation. They show that the PEG adsorption on the Cu electrode is weak at open circuit, but increases under polarisation. In complementary EQCM tests made on Au and on electrodeposited Cu, we conclude that the H 2 gas production reduces the apparent mass of the gold surface. In contrary on Cu, H 2 entrapped in the Cu deposit increases the mass. In all cases, there is an important mass hysteresis. Whatever the substrate, the addition of PEG + Cl − to solution has a beneficial effect by reducing this hysteresis due to the H 2 production. For Cu electrolytes, the PEG addition to solution has little effect, while the simultaneous PEG + Cl − addition inhibits both the Cu 2+ reduction current and the mass increase. Atomic force microscopy (AFM) images made on the deposits confirm the beneficial effect of the two additives in solution.

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Section: Eqcm Measurementsmentioning

confidence: 99%

“…Moreover, in recent studies [6] PEG and Cl − coadsorption has been investigated on Pt in acid baths and one finds that the adsorption of PEG occurs via a non faradic process and that no adsorption is observed at the open circuit potential.…”

Section: Introductionmentioning

confidence: 98%

Effect of additives on Cu electrodeposits: electrochemical study coupled with EQCM measurements

Eyraud¹,

Kologo²,

Bonou³

et al. 2006

J Electroceram

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“…The presence of organic ligands and additives in the silver electroplating baths will lead to the formation of smooth and shiny deposits, which are primarily attributed to the adsorption of the organic molecules onto the electrode surface during electrodeposition [5,6]. The adsorption of these species at the growing silver deposits would influence the double electrical layers and charge transfer resistance (R ct ) of the interface, leading to the change of reaction rate even the steady state growth of silver electrodeposition [7].…”

Section: Introductionmentioning

confidence: 99%

Potential-dependent adsorption of uracil on a silver electrode in alkaline solutions

Lin¹,

Xie²,

Tian³

et al. 2009

Journal of Electroanalytical Chemistry

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“…[21][22][23] However, in spite of numerous studies on the mechanism underlying the adsorption of polyethoxylated compounds onto electrode surfaces, to our knowledge, no previous study has examined the thermodynamics of the adsorption of such compounds at the metal=solution interface.…”

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confidence: 99%

Thermodynamic Studies of PEG (Mw 20,000) Adsorption onto a Polycrystalline Gold Electrode

Méndez‐Albores

Moroń

Ortiz‐Frade

et al. 2011

J. Electrochem. Soc.

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Cyclic voltammetry, differential capacity, and chronocoulometry were employed in a quantitative study of polyethylene glycol (Mw 20000) (PEG 20000 ) adsorption onto a polycrystalline Au substrate. The surface tension, film pressure, relative Gibbs surface excess, and the Gibbs energy of adsorption were determined as a function of the electrode potential. The results indicated that, in the potential interval studied (À0.9 to 0.35 V vs saturated calomel electrode), PEG 20000 adsorbed onto the polycrystalline Au surface via its oxygen atoms as a flat submonolayer of rodlike molecules. The adsorbed mass increased considerably with the increasing PEG 20000 concentration and more positive potential. In addition, the surface tension decreased as the quantity of PEG 20000 adsorbed on the surface rose with the increasing PEG 20000 concentration, an effect characteristic of surface active agents. The maximum surface concentration was found to be 4.59 Â 10 À10 mol oxygen cm À2 for the highest PEG 20000 concentration studied (100 lM). The Gibbs energy of adsorption (DG ads ) was determined using the Henry adsorption isotherm. On the basis of the DG ads values obtained, it was concluded that the PEG 20000 molecules were weakly chemisorbed on the polycrystalline Au surface.

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An EQCM study of polyethyleneglycol 8000 adsorption and its coadsorption with Cl− ions on Pt in perchloric acid solutions

Cited by 28 publications

References 22 publications

Effect of additives on Cu electrodeposits: electrochemical study coupled with EQCM measurements

Effect of additives on Cu electrodeposits: electrochemical study coupled with EQCM measurements

Potential-dependent adsorption of uracil on a silver electrode in alkaline solutions

Thermodynamic Studies of PEG (Mw 20,000) Adsorption onto a Polycrystalline Gold Electrode

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