Electrochemical formation and reduction of silver oxides in alkaline media

Droog, John M.M.; Huisman, Fred

doi:10.1016/s0022-0728(80)80326-3

Cited by 82 publications

(45 citation statements)

References 57 publications

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“…The A1 (most cathodic) peak was originally identified by Dirske and De Vries [15], who reported a potential of formation of +95 mV versus Ag/ AgCl 4 M KCl and assigned this peak to AgOH film formation, and a concurrent dissolution of the electrode. A number of other authors are in agreement with this general conclusion [12, [16][17][18][19][20]. The formation of a soluble AgO-species prior to bulk oxide formation has been supported by the thermodynamic calculations of Pound et al [12].…”

Section: Introductionsupporting

confidence: 64%

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Nucleation of Silver (I) Oxide Investigated by Spectroscopic Ellipsometry

Mayer

Müller

1988

J. Electrochem. Soc.

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The early stages of the anodic oxidation of Ag(111) in 1MKOH during the application of potential steps, current steps, and potential sweeps have been investigated by spectroscopic ellipsometry. Film thicknesses and surface coverages have been derived from the measurements by use of a dual‐layer optical model. The results are supported by SEM observations on selected specimens. Oxide crystals are found to nucleate from a previously formed homogeneous oxide layer. A decrease in number density of crystals of several orders of magnitude during film growth has been found and is attributed to the growth of larger crystals at the expense of smaller ones.

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Section: Introductionsupporting

confidence: 64%

“…Typical polarization curves for galvanostatic oxidation [18,19,29,30J show a rising potential that peaks and then shows a shallow dip. Figure 5 shows potential measurements corresponding to the optical measurements shown in figure 4.…”

Section: Potential Sweepmentioning

confidence: 99%

Nucleation of Silver (I) Oxide Investigated by Spectroscopic Ellipsometry

Mayer

Müller

1988

J. Electrochem. Soc.

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“…For the nucleation-controlled process, reversal of the sweep before the growing islands overlap produces a characteristic continuing increase of current, since growth around the growth centres continues along longer perimeters in the reversed sweep, and new nuclei continue to be formed [24]. This has been found experimentally for example in the three-dimensional case of bulk formation of AgO on silver electrodes in alkaline solutions [25,26].…”

Section: Measurements At Different Sweep Ratesmentioning

confidence: 81%

Oxygen electrosorption on Ag(111) and Ag(110) electrodes in NaOH solution

Droog¹

1980

Journal of Electroanalytical Chemistry and Interfacial Electroc

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The first stages of the anodic oxidation of Ag(111) and Ag(110) electrodes in NaOH solution were studied by potential sweep voltammetry and ellipsometry. It was found that in the potential region studied, dissolution of silver species and electrosorption of oxygen occur. The (110) face is much more reactive to oxygen than the (111) face. On Ag(ll0) oxygen is reversibly adsorbed via a process of random deposition. The half-width of the adsorption peak indicates attractive lateral interactions in the chemisorbed layer.

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“…They attributed this electrochemical behaviour to the reduction of oxygenated species of Ag(I). However, other authors [24] have not observed this peak on silver electrodes that were initially reduced at cathodic potential. Furthermore, a cathodic peak preceding the reduction of dissolved oxygen was also observed with stainless steel in aerated solution of Na 2 SO 4 and natural water.…”

Section: Xps Analysismentioning

confidence: 75%

Electrochemical study of the tarnish layer of silver deposited on glass

Amor

Sutter

Takenouti

et al. 2014

Electrochimica Acta

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Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to characterize the tarnished thin layer of silver deposited on glass. Instead of natural tarnishing in air environment, an acceleration of tarnishing process was realized by immersion of Ag covered glass in 10 µM K 2 S medium. The X-ray photoelectron spectroscopy (XPS) shows that tarnishing product formed on the silver surface consisted of Ag 2 S and Ag 2 O. As electrochemical characterization, the measurements were carried out in aerated 0.5 M Na 2 SO 4 solution adjusted at pH 10. The impedance spectra collected in sulphate medium at the opencircuit potential show one capacitive loop in parallel with a high resistance, which reflects a blocking electrode behaviour. However, the equivalent electrical circuit, Rs-(CPE//R) is insufficient to reproduce the experimental results correctly. To minimize the dispersion between the experimental and fitted data, the CPE contribution is replaced by two normal power-law distributions of the local resistivity to interpret the tarnishing process in K 2 S medium with respect to the immersion time. These distributions are associated with the Ag 2 S and Ag 2 O layers.

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Electrochemical formation and reduction of silver oxides in alkaline media

Cited by 82 publications

References 57 publications

Nucleation of Silver (I) Oxide Investigated by Spectroscopic Ellipsometry

Nucleation of Silver (I) Oxide Investigated by Spectroscopic Ellipsometry

Oxygen electrosorption on Ag(111) and Ag(110) electrodes in NaOH solution

Electrochemical study of the tarnish layer of silver deposited on glass

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