A new method to produce graphite decorated by electrodeposited metal: The case of silver electrodeposition process inside a graphite paste electrode

Shimizu, Lizandra C.B.; Gama, Elter G.; Machado, Douglas Silva; Carlos, I.A.; Oliveira, G. M. de

doi:10.1016/j.jelechem.2020.114198

Cited by 2 publications

(2 citation statements)

References 48 publications

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“…We use also a galvanostatic connected to two anodes (counter electrode [CE]) and a cathode (substrate or working electrode [WE]) to provide the electric current. These electrodes are immersed in a bath containing silver ions solution such as silver nitrate (AgNO 3 ) [ 45–47 ] or silver cyanide (AgCN). [ 48 ] The silver ions are transferred to neutral atoms by the following reduction equation:

{Ag}_{(aq)}^{+} + 1 {normale}^{-} \to {Ag}_{(s)}

the silver ions Ag + in the initial state are adsorbed by the silver cathode surface and then converted to adions.…”

Section: Simulation Methods and Modelmentioning

confidence: 99%

Morphological Surface Study of Silver Electrodeposition by Kinetic Monte Carlo‐Embedded Atom Method

Ataalite

Dardouri

Hasnaoui

et al. 2022

Physica Status Solidi (b)

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Herein, a kinetic Monte Carlo (KMC) simulation of the 3D electrodeposition of Ag metal on Ag cathode surface is carried out under galvanostatic, different substrate temperatures, and current density conditions. Both deposition and diffusion processes are considered during the film electrodeposition, where each adatom diffuses via nearest‐neighbor hopping, exchange, and step‐edge atom exchange mechanisms. The interatomic interaction is described within the well‐known embedded atomic method (EAM) framework. The number of hopping, exchange, and step‐edge exchange mechanisms is evaluated using a power law of time n hop ∝ t α , n exch ∝ t β , and n step ∝ t γ , respectively. However, the step‐edge exchange mechanism depends on current density. The effects of deposited atom number, current density, and substrate temperature on the transitions of surface morphologies of the electrodeposited thin film are studied considering different combinations of the mechanisms. The results indicate that surface roughness increases when the number of deposited atoms and the current density increase, but when the substrate temperature increases the roughness decreases. In addition, the resulting surface has been found to be smooth if all diffusion mechanisms are involved in the electrodeposition phenomenon, while roughness occurs when diffusion takes place only via hopping mechanism. Furthermore, the surface roughness behavior is found to be related to clusters and islands distribution.

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{Ag}_{(aq)}^{+} + 1 {normale}^{-} \to {Ag}_{(s)}

the silver ions Ag + in the initial state are adsorbed by the silver cathode surface and then converted to adions.…”

Section: Simulation Methods and Modelmentioning

confidence: 99%

Morphological Surface Study of Silver Electrodeposition by Kinetic Monte Carlo‐Embedded Atom Method

Ataalite

Dardouri

Hasnaoui

et al. 2022

Physica Status Solidi (b)

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“…Deposition of silver film.-The electrodeposition of silver on the graphite-paraffin electrode was based on the electrodeposition by anodic stripping of a nickel film on a graphite-epoxy composite electrode 38 and the reagent chosen was silver nitrate once it was previously used to the electrodeposition of a silver film, by cyclic voltammetry, on a carbon paste electrode. 39 The optimum concentration of silver nitrate was 5 × 10 −2 mol l −1 , the electrodeposition potential was −0.6 V and the electrodeposition time was 8 min. The metallic film activation was made by cyclic voltammetry in a potential range from −0.2 V to 1.2 V, at a scan rate of 0.1 V s −1 and in a solution of acetic acid and ammonium hydroxide at concentrations 5.2 × 10 −5 mol l −1 and 7.5 × 10 −5 mol l −1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Determination of Saccharin through a Carbon Paste Sensor Modified by Electrodeposition of Silver Film

Aredes¹,

Moreira²,

Amorim³

et al. 2022

J. Electrochem. Soc.

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Saccharin is a synthetic artificial sweetener, widely used in several dietary products. In this work, a graphite and paraffin-based composite electrode (80% m/m in graphite) modified by electrodeposition of silver film was developed to quantify saccharin in samples of commercial sweeteners through cyclic voltammetry. The electrodeposition step consisted of the application of -0.6 V (vs. Ag|AgClsat|KClsat) for 8 minutes under gentle stirring, with the electrode immersed in a solution containing 0.05 mol L-1 silver nitrate. The quantification occurred by cyclic voltammetry between -0.2 V to 0.8 V at 100 mV s-1, the signal being observed at +0.2 V and having ammonium acetate and acetic acid as the electrolyte. For the optimized conditions, a linear behavior between 4 x 10-5 and 9 x 10-4 mol L-1 (R2> 0.99) was observed, with detection and quantification limits of 20.6 μmol L-1 and 62.6 μmol L-1, respectively. To evaluate the accuracy, strategies based on volumetric precipitation and gravimetry were used as comparison procedures in which both the obtained product (silver saccharinate) and the standard saccharin were characterized by different thermoanalytical (TGA-DTG) and spectroscopic techniques (FTIR). The results were compared by a chromatographic method described in the literature and the results were satisfactory and comparable.

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A new method to produce graphite decorated by electrodeposited metal: The case of silver electrodeposition process inside a graphite paste electrode

Cited by 2 publications

References 48 publications

Morphological Surface Study of Silver Electrodeposition by Kinetic Monte Carlo‐Embedded Atom Method

Morphological Surface Study of Silver Electrodeposition by Kinetic Monte Carlo‐Embedded Atom Method

Determination of Saccharin through a Carbon Paste Sensor Modified by Electrodeposition of Silver Film

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