Impedance measurements of zinc and amalgamated zinc electrodes in alkaline electrolyte

Hendrikx, Jlhm Jos; Visscher, Whm Wil; Barendrecht, E Embrecht

doi:10.1016/0013-4686(85)80163-8

Cited by 14 publications

(7 citation statements)

References 13 publications

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“…The value of a strongly suggests that the current rise in this potential range is due to activation and not due to the increase in the surface area. The limiting currents also are in approximate agreement with the literature values for zinc deposition in three dimensional cell (14) although the absence of a supporting electrolyte, for reasons that will be explained shortly, makes any comparison tenuous at best. The kinetics approaches the diffusion-limited current at potentials negative of -1.3V vs. SCE for both electrolytes.…”

Section: Fl I(u)supporting

confidence: 82%

Morphological Evolution in Zinc Electrodeposition

Kahanda

Tomkiewicz

1989

J. Electrochem. Soc.

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We present an experimental study of the electrodeposition of zinc in a thin layer, three‐electrode electrochemical cell. We show that as the steady‐state current‐potential behavior approaches mass transfer limited kinetics, the fractal dimension of the morphology of the deposit converges to the DLA value of 5/3 . We also compare the evolution of the growth patterns with and without supporting electrolyte.

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Section: Fl I(u)supporting

confidence: 82%

Morphological Evolution in Zinc Electrodeposition

Kahanda

Tomkiewicz

1989

J. Electrochem. Soc.

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“…cm-1), respectively. The interfacial impedance Z along the pore wall is a specific impedance per unit pore length (12. cm) and Z' is the interfacial impedance (12) at the pore base. The potentials Em and Es, and also the currents Im and Is in the material and solution, respectively, depend on the distance x from the pore mouth.…”

Section: Model For Zinc Dissolutionmentioning

confidence: 99%

“…Various mechanisms involving several intermediate species, belonging to the compounds: ZnOH-, ZnOH, Zn(OH)2, Zn(OH)~, Zn(OH)~, have been proposed in the literature (2)(3)(4)(5)(6)(7)(8)(9). These kinetic models, deduced from short-time measurements and treated by the pseudo-equilibrium method, are not sufficient to account for the low-frequency relaxation processes revealed by ac impedance spectroscopy (10)(11)(12)(13)(14) nor explain the sharp electrode activation observed on steadystate polarization curves in both cathodic and anodic directions (10,11,13).…”

mentioning

confidence: 98%

The Behavior of Zinc Electrode in Alkaline Electrolytes: II . A Kinetic Analysis of Anodic Dissolution

Cachet

Saïdani

Wiart

1992

J. Electrochem. Soc.

103

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A model for the kinetics of active zinc dissolution is developed taking into account the presence of an interfacial layer. From electrode impedance spectroscopy, it is shown that the metal dissolution takes place essentially at the base of pores in a conductive layer of oxidation products which is progressively degraded by the anodic current. This model accounts for the four loops observed on complex plane impedance plots with decreasing frequency: (i) a capacitive loop generally highly depressed in connection with the current penetration within pores; (ii) an inductive loop corresponding to the presence of a monovalent intermediate ZnI in the reactive interphase; (iii) a capacitive loop resulting from the precipitation and escape of ZnII ions by diffusion from the pore bases; and (iv) an inductive loop consequent on the slow decrease of the pore length with increasing anodic polarization. Inhibition of zinc corrosion by an organic additive is shown to be related to changes in both the kinetic parameters of reactions and the layer properties.

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“…Because of its industrial use in alkaline batteries, the interface between zinc and highly concentrated basic solutions (7 M KOH) has been widely studied by means of kinetic techniques, regarding zinc electrodeposition as electrodissolution. [1][2][3][4][5][6][7] Wiart et al have notably proposed reaction mechanisms by using electrochemical impedance measurements. [8][9][10][11][12] They have shown that, according to the cathodic potential, several deposit morphologies can be observed.…”

Section: Introductionmentioning

confidence: 99%

“…Because of its industrial use in alkaline batteries, the interface between zinc and highly concentrated basic solutions (7 M KOH) has been widely studied by means of kinetic techniques, regarding zinc electrodeposition as electrodissolution. − Wiart et al have notably proposed reaction mechanisms by using electrochemical impedance measurements. − They have shown that, according to the cathodic potential, several deposit morphologies can be observed. The surface of a deposit grown under a low overvoltage exhibits a spongy aspect and becomes compact at higher overvoltages, while the metal growth under still larger overvoltages is dendritic. , …”

Section: Introductionmentioning

confidence: 99%

EIS Investigation of Zinc Electrodeposition in Basic Media at Low Mass Transfer Rates Induced by a Magnetic Field

et al. 1998

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This paper is devoted to the description of magnetic field effects on zinc electrodeposition from basic media. The major effect of the magnetic field stems from a slight magnetohydrodynamic forced convection located close to the cathodic interface. Classical impedance analysis reveals that the reaction mechanism is governed by two diffusing species, Zn(II) and OH -, the contributions of which have been discerned. This leads to a good agreement between experimental and theoretical impedance diagrams and shows, once again, that the magnetic field exerts no effect upon the transfer kinetics.

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Impedance measurements of zinc and amalgamated zinc electrodes in alkaline electrolyte

Cited by 14 publications

References 13 publications

Morphological Evolution in Zinc Electrodeposition

Morphological Evolution in Zinc Electrodeposition

The Behavior of Zinc Electrode in Alkaline Electrolytes: II . A Kinetic Analysis of Anodic Dissolution

EIS Investigation of Zinc Electrodeposition in Basic Media at Low Mass Transfer Rates Induced by a Magnetic Field

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