The electrochemical formation of Ag2O in KOH electrolyte

Ambrose, J. R.; Barradas, R.G.

doi:10.1016/0013-4686(74)80023-x

Cited by 62 publications

(56 citation statements)

References 9 publications

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“…that the complexity of the Ag20 peak in the voltammogram is associated with the heavy disorder of the silver surface. Another feature that can be explained is that the conversion of Ag20 to AgO decreases with increasing sweep rate [48,64]. At high sweep rates most of the AgO is formed at higher potentials than in the case of low sweep rates, and so less AgO is formed (see Fig.…”

Section: Comparison Of Chronoamperometry Results With Galvanostatic Amentioning

confidence: 99%

“…The peak current for the Ag20 formation is proportional to the square root of the sweep rate [38,55,59,64]. The peak current does not depend on whether or not the solution is stirred [38,59], nor on the rotation speed of the electrode [59,63], nor on the OH-concentration [55].…”

Section: Potentiodynamic Measurementsmentioning

confidence: 97%

“…The amount of electricity used to form AgO is considerably less than the amount used to form Ag20 [48,51,52,64,66]. The conversion of Ag20 to AgO decreased with increasing sweep rate [48,64].…”

Section: Potentiodynamic Measurementsmentioning

confidence: 99%

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Electrochemical formation and reduction of silver oxides in alkaline media

Droog¹

1980

Journal of Electroanalytical Chemistry

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The anodic oxidation of silver electrodes in NaOH solution and the reduction of the silver oxides formed were studied by potential step chronoamperometry. Oxidation of Ag to Ag20 is a diffusion-controlled reaction, the diffusion control being established in the solid phase. Oxidation of Ag20 to AgO proceeds via a nucleation and growth-controlled process. The amount of AgO decreased with increasing step height. The current--time curves for this reaction have been analysed with the Kolmogoroff--Avrami equation. Reduction of AgO to Ag20 occurs initially on the outside of the electrode, and the rate of the reaction is limited by diffusion of ions across the thickening layer of Ag20. Reduction of Ag20 to Ag proceeds via a nucleation and growth reaction.

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Section: Comparison Of Chronoamperometry Results With Galvanostatic Amentioning

confidence: 99%

Section: Potentiodynamic Measurementsmentioning

confidence: 97%

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Electrochemical formation and reduction of silver oxides in alkaline media

Droog¹

1980

Journal of Electroanalytical Chemistry

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“…electrochemical quartz crystal microbalance [22,23], XPS [15] and ellipsometric [76][77][78] measurements. The silver oxidation in an alkaline environment can be accompanied by a dissolution of the electrode [22,23,38,67,72,[77][78][79], and Ag 2 O itself may undergo a dissolution as well [22,79]. Thus, apart from the reduction of the solid oxide [22], the charge of peak (C) may also contain a contribution from reduction of soluble Ag species formed during the electrode oxidation [24,[70][71][72]77].…”

Section: Resultsmentioning

confidence: 99%

“…10 mV and a corresponding reduction peak (C) seen at potentials more negative than 100 mV (the exact location depends on the amount of Ag compounds subjected to the reduction [37,69]). Detailed discussion of the processes related to the anodic currents (A) can be found elsewhere [21][22][23][24][25][26][27][28][29][70][71][72][73][74][75]. Various products of Ag oxidation at potentials up to ca.…”

Section: Resultsmentioning

confidence: 99%

Impedance study on the capacitance of silver electrode oxidised in alkaline electrolyte

Grdeń

2017

J Solid State Electrochem

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Electrochemical properties of oxide-covered polycrystalline Ag electrodes were studied in a 0.1 M KOH aqueous electrolyte. The oxide layers formed by a constant potential oxidation at 420 mV vs. Hg|HgO are composed of oxygen-deficient Ag 2 O as follows from the XPS and Auger experiments. Steady-state conditions required for collection of valid impedance spectra were obtained at a potential range of 345-365 mV. The components of the equivalent circuit used for the impedance spectra analysis are analysed as a function of the Ag 2 O layer thickness. The value of the coefficient of the constant phase element (CPE) attributed to the oxide layer is Ag 2 O thickness dependent. On the other hand, the components of the CPE describing the double-layer capacitance of the oxide-covered Ag electrode are independent on the oxide thickness and their values are comparable to those obtained for the oxide-free metal. This indicates that the double-layer capacitances of oxide-covered and oxide-free Ag electrodes are similar.

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Selective and Efficient Reduction of Carbon Dioxide to Carbon Monoxide on Oxide‐Derived Nanostructured Silver Electrocatalysts

et al. 2016

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In this work, the selective electrocatalytic reduction of carbon dioxide to carbon monoxide on oxide‐derived silver electrocatalysts is presented. By a simple synthesis technique, the overall high faradaic efficiency for CO production on the oxide‐derived Ag was shifted by more than 400 mV towards a lower overpotential compared to that of untreated Ag. Notably, the Ag resulting from Ag oxide is capable of electrochemically reducing CO2 to CO with approximately 80 % catalytic selectivity at a moderate overpotential of 0.49 V, which is much higher than that (ca. 4 %) of untreated Ag under identical conditions. Electrokinetic studies show that the improved catalytic activity is ascribed to the enhanced stabilization of COOH. intermediate. Furthermore, highly nanostructured Ag is likely able to create a high local pH near the catalyst surface, which may also facilitate the catalytic activity for the reduction of CO2 with suppressed H2 evolution.

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The electrochemical formation of Ag2O in KOH electrolyte

Cited by 62 publications

References 9 publications

Electrochemical formation and reduction of silver oxides in alkaline media

Electrochemical formation and reduction of silver oxides in alkaline media

Impedance study on the capacitance of silver electrode oxidised in alkaline electrolyte

Selective and Efficient Reduction of Carbon Dioxide to Carbon Monoxide on Oxide‐Derived Nanostructured Silver Electrocatalysts

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