Kinetic peculiarities of anodic dissolution of silver and Ag–Au alloys under the conditions of oxide formation

Vvedenskii, A. V.; Grushevskaya, S. N.; Kudryashov, D. A.; Kuznetsova, T. F.

doi:10.1016/j.corsci.2007.03.046

Cited by 11 publications

(6 citation statements)

References 19 publications

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“…3b-d) several identifications of this signal may be proposed: it may be attributed to OH − incorporated into the oxide (XPS experiments presented in [15] indicate possibility of incorporation of the double-layer species into the Ag 2 O film) or other forms of the oxygen dissolved in the bulk of the oxide [86]. It should be noted that Ag(I) hydroxide is unstable at room temperature and decomposes to Ag 2 O and water [27,93]. Although formation of [41,42,71,79,[94][95][96][97], the existence of silver-hydroxyl ion species under UHV conditions seems to be highly unlikely.…”

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%

“…Silver oxidation in an alkaline electrolyte starts at ca. 10 mV vs. Hg|HgO; the usually reported oxidation products are Ag 2 O and AgO, depending on the oxidation potential [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. AgO is described as a mixture of Ag(I) and Ag(III) species [11,39,40].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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

Grdeń

2017

J Solid State Electrochem

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“…This situation is often realized at the cathodic electrodeposition of metals and alloys, [1] as well as at their anodic oxidation in alkaline media. [2] Kinetics of phase formation is mainly studied in the framework of deterministic models of growth of two-dimensional (2D) and three-dimensional (3D) nucleus of a new phase. It is assumed that the activation of the centers of formation of these nuclei can occur simultaneously (instantly) or in a continuous mode when the concentration of these centers increases continuously over time.…”

Section: Introductionmentioning

confidence: 99%

Separation of transient partial fluxes of nucleation/growth of a new phase and electrode reaction by the chronoamperometry method

Vvedenskii¹,

Kozaderov²,

Gutorov³

2010

Surface & Interface Analysis

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One of the basic methods of studying of the electrochemical formation of a new phase is by the obtaining of potentiostatic i,t-dependences with their processing within the framework of various models of nucleation. The situation is highly complicated in the case of some Faraday processes that proceed alongside the phase formation. On the basis of the mass balance analysis in conditions of 3-dimensional (3D) nucleation using the data on electrode reaction kinetics, the procedure of graphical processing of the complete i,t-curves, which allows to reveal a partial nucleation flux is suggested. The procedure was used when studying the following electrochemical processes: (i) cathodic evolution of hydrogen on transition metals from acidic sulphate solutions, and (ii) selective anodic dissolution (dealloying) of binary Au-containing alloys at overcritical potentials where nonequilibrium phase transition of gold occurs. It was established that both processes are carried out in a mode of instantaneous activation of nucleation sites and controlled by the lateral diffusion of adsorbed atoms of hydrogen or gold, respectively, to its hemispherical nuclei. The role of the solid electrode composition, overpotential and presence of surface-active organic substances in a solution is investigated.

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“…U elektrohemiji se već izvesno vreme koristi metoda ciklične voltametrije [1] za karakterizaciju dvokomponentnih legura i čistih metala [2][3][4][5][6][7][8][9]. Međutim, u dostupnoj literaturi ova metoda je malo korišćena za karakterizaciju legura plemenitih metala.…”

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Electrochemical investigation of 18k gold in acidic electrolyte

Grekulovic

Rajčić-Vujasinović

Stević

2009

Hem Ind

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The results of an attempt in using cyclic voltammetry for characterization of gold, silver, copper and 18-k gold alloys by their anodic behavior in 1 mol/dm3 H2SO4 are presented in this paper. Gold alloys containing 75 mass% Au are named as 18-k gold, but it is usually three component alloy containing 75 mass% Au, 12.5 mass% Ag and 12.5 mass% Cu as the main components. Investigated alloys were obtained by melting powders of pure metals mixed in corresponding ratio, casting, cooling in air, rolling and drawing in the wire shape. To achieve the required mechanical properties, the alloys had heat-treated three times. Each alloy exhibits characteristic current peaks on voltammogram that can be used to recognize the kind of present alloying metal in gold. Also, the content of the alloying metal can be roughly estimated from the peak value of current densities

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Kinetic peculiarities of anodic dissolution of silver and Ag–Au alloys under the conditions of oxide formation

Cited by 11 publications

References 19 publications

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

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

Separation of transient partial fluxes of nucleation/growth of a new phase and electrode reaction by the chronoamperometry method

Electrochemical investigation of 18k gold in acidic electrolyte

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