Potentiodynamic Characteristics of Zinc Elektrodeposition from Chloride Solutions

Zakiyya, Hanna; Kékesi, Tamás

doi:10.26649/musci.2019.084

Cited by 2 publications

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“…The fuel potential in them can not be employed in an electrically rechargeable system because dendrite formation occurs during recharging. [1,2] Although some studies have been done, [3][4][5][6][7][8] this topic is still in its infancy.…”

Section: Introductionmentioning

confidence: 99%

Inhibitive Action of Sulfide Ions on Corrosion and Enhancing Charge‐Discharge Efficiency of Zinc and Zinc‐Indium Alloy as Anode for Alkaline Batteries

El‐Lateef,

Elrouby,

El‐Shafy Shilkamy

et al. 2024

ChemElectroChem

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The obtained data reveal that the coverage of surface (θ) and protection efficiency (η%) for the studied electrodes increases gradually as the inhibitor concentration increases. Tafel plot is carried out at variant temperatures in the investigated basic electrolyte containing 1×10−1 M of S ions. This study reveals that the activation energy barrier of the studied alloy is higher than that of pristine zinc anode at a fixed inhibitor concentration. It is observed that ▵Goads. and η% values rise with rising solution temperature, indicating that S ions adsorption on the studied electrode surfaces occurs by a chemisorption mechanism. Other calculations are made for the additional thermodynamic parameters such as ▵Hoadsand ▵Soads. The zinc anodes get more efficient when S ions are added to the solution, considerably decreasing electrochemical polarization. In addition, the presence of indium sulfide improves the exposed surface area of the alloy, supplying additional improvement in charge‐discharge efficiency. Density functional theory (DFT) is utilized to extract the quantum data to acquire a deeper understanding of the chemical processes between sulfide ions at the interface.

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Section: Introductionmentioning

confidence: 99%

Inhibitive Action of Sulfide Ions on Corrosion and Enhancing Charge‐Discharge Efficiency of Zinc and Zinc‐Indium Alloy as Anode for Alkaline Batteries

El‐Lateef,

Elrouby,

El‐Shafy Shilkamy

et al. 2024

ChemElectroChem

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“…The H 2 bubbles adhering to the cathode surface may modify the available interfacial area, interfering with the current distribution and intensifying the changes of ionic compositions [28]. Under extreme conditions, large zinc dendrites may appear as a result of inhomogeneous nucleation and crystal growth [33]. Low (< 100 A/m 2 ) current densities have been generally recommended to avoid excessive hydrogen evolution and the deterioration of deposit quality [34], which seems rather low for an e cient production.…”

Section: Introductionmentioning

confidence: 99%

Interpreting the main effects on the efficiency and morphology for establishing a procedure of electrodepositing Zn from purified chloride SPL solutions

Zakiyya,

Illés,

Kékesi

2024

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Detailed potentiodynamic and galvanostatic methods have been used to investigate the electrodeposition of Zn and to develop a reliable recovery method from a purified and concentrated spent pickling liquor (SPL) of hot dip galvanization. Applying various combinations of Zn concentration, pH, agitation, apparent current density (c.d.) and additional NaCl concentration, a uniform initial deposit could be observed at the cathode, however the subsequent dendrite formation and the development of protrusion at the edges were targeted for a deeper investigation. The potentiodynamic experiments, showed the importance of H2 evolution influenced by the electrolyte properties and the cathodic polarization. The cathodic current was dominated by Zn reduction in the pH > 2 range during the fast potentiodynamic runs of the 30 – 150 g/dm3 Zn concentration range in the stationary electrolyte. Increasing the Zn concentration could considerably improve the deposit morphology. In the long-term galvanostatic experiments the current efficiency increased with the increase of pH in the examined wide Zn concentration range but the c.d. needs optimization. A current efficiency (c.e.) of ~99% can be reached with an electrolyte of pH ~5, Zn concentration ~50 g/dm3 applying a c.d. in the 300 – 600 A/m2 range. At low (~10 g/dm3) Zn concentrations the rate of hydrogen evolution increases dramatically. The addition of NaCl can practically improve the c.e. if the Zn concentration is at least around 50 g/dm3. In contrast, this improvement is largely off-set by the negative effects of strong H2 evolution at as low Zn concentrations as e.g. 10 g/dm3. Higher NaCl additions or too high Cl- ion concentrations, however inhibit the cathodic reaction of the electroactive species by stronger chloro-complex formation. In this case the intensive H+ reduction causes hydroxide precipitation.

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Potentiodynamic Characteristics of Zinc Elektrodeposition from Chloride Solutions

Cited by 2 publications

References 0 publications

Inhibitive Action of Sulfide Ions on Corrosion and Enhancing Charge‐Discharge Efficiency of Zinc and Zinc‐Indium Alloy as Anode for Alkaline Batteries

Inhibitive Action of Sulfide Ions on Corrosion and Enhancing Charge‐Discharge Efficiency of Zinc and Zinc‐Indium Alloy as Anode for Alkaline Batteries

Interpreting the main effects on the efficiency and morphology for establishing a procedure of electrodepositing Zn from purified chloride SPL solutions

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