Polarization studies on cadmium by galvanostatic and potentiostatic techniques

Sanghi, Indra; Visvanathan, Susan; Ananthanarayanan, S.

doi:10.1016/0013-4686(60)80005-9

Cited by 13 publications

(4 citation statements)

References 22 publications

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“…Visco and Sonner (19) recently reinvestigated the subject and established that the dissolved cadmium species exists in the form of Cd (OH)z-in solutions of KOH from 2 to 15M. Thus, in agreement with Milner and Thomas (15) we shall write Cd -5 3OH-~--Cd(OH)~-+ 2e- [3] k Cd(OH)z-~ Cd(OH)~ -5 OH- [4] where k is defined as the heterogeneous rate constant for the precipitation reaction. The current consumed in the formation of CdO, if any, at the small anodic potentials (<40 mV) is negligible.…”

Section: Potentiostaticsupporting

confidence: 58%

“…electron transfer reaction [3] is sufficiently fast that the disk current, except during the short initial transient period, is controlled by the rate of the precipitation reaction [4] and/or the rate of mass transfer of Cd(OH) 3-. The former is given by kc ~ while the latter by (D/5) c~ thus the total rate of disappearance of Cd(OH)3-is given by (k -5 D/8) c ~ Assuming that the disk current flows only area, we can write /disk = 2FA (1 --e) through the uncovered where 0 is the fraction of the disk surface covered by Cd (OH)2.…”

Section: March 1970mentioning

confidence: 99%

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On the Oxidation-Reduction Mechanism of the Cadmium Metal-Cadmium Hydroxide Electrode

Okinaka¹

1970

J. Electrochem. Soc.

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Electrochemical oxidation‐reduction processes of the normalCd/normalCdfalse(OH)2 electrode in concentrated alkaline solutions were investigated by using a rotating ring‐disk electrode as well as a stationary electrode. Results support the mechanism that the anodic oxidation of Cd to normalCdfalse(OH)2 in the active potential range proceeds entirely through the dissolution‐precipitation sequence, while the cathodic reduction of normalCdfalse(OH)2 takes place both through the solution phase and by a direct solid‐state mechanism. * Electrochemical Society Active Member.

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Section: Potentiostaticsupporting

confidence: 58%

Section: March 1970mentioning

confidence: 99%

On the Oxidation-Reduction Mechanism of the Cadmium Metal-Cadmium Hydroxide Electrode

Okinaka¹

1970

J. Electrochem. Soc.

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“…The cathodic currents on cadmium in 0.02-3.5 M KOH present a transition region which lies between the large current density increase according to high cathodic overpotentials and the fast cathodic current density decrease preceding the active metal dissolution range [9]. As the potential of zero charge, Ez, of cadmium is located, presumably, within this transition region, it was suggested that the cathodic current behaviour can be related to the change in the adsorbed H20-OH-ion layer on the cadmium surface.…”

Section: Introductionmentioning

confidence: 97%

Depolarization of the hydrogen evolution reaction on cadmium electrodes in alkaline media

1988

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Depolarization of the hydrogen evolution reaction on high purity polycrystalline cadmium electrodes in alkaline media (12 ~< pH ~ 14 and 5 ~ T ~< 55 ~ C) produced by cathodization in the range of potential comprised between the Cd/Cd(OH)2 electrode potential and the net HER potential wader solution stirring conditions has been studied. The depolarization effect depends on the perturbing potential programme and it is little affected by the alkaline cation in solution. Results are discussed in terms of three concurrent reactions, namely the electrochemical formation of Cd(OH)2 and soluble Cd(OH)3, the HER and the electrocrystallization of cadmium renewing the fresh active sites for the HER, SEM micrographs of activated cadmium electrodes reveal a heterogeneous surface topography of the new cadmium layers.

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“…Cadmium electrode.--Two radically different mechanisms have been proposed in the literature for the anodic oxidation of cadmium: the dissolution-precipitation mechanism (7)(8)(9)(10)(11)(12)(13) and the solid-state oxidation mechanism involving ionic transport through a Cd(OH)2-film (14)(15). The mechanism of cathodic reduction of Cd(OH)2 has been studied to a much less degree than its anodic counterpart in spite of its importance in the charge process of the battery cadmium electrode (14,16,17).…”

Section: Previous Workmentioning

confidence: 99%

Temperature Dependence of Iron and Cadmium Alkaline Electrodes

Öjefors¹

1976

J. Electrochem. Soc.

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The charge and discharge reactions of the alkaline iron and cadmium electrodes go over the soluble intermediates HFeO2-, FeO2-, and Cd (OH)42-, respectively. The saturation concentrations for these ionic species are rate determining as they directly influence the rates of diffusion and crystallization. B:~ calculating the temperature coefficients for the reactions involved, it is shown that the saturation concentrations for HFeOe-and FeO2-are highly temperature dependent while this is not the case for the cadmium intermediate. This explains the bad performance of the iron electrode at low temperatures. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 141.210.2.78 Downloaded on 2015-06-06 to IP

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Polarization studies on cadmium by galvanostatic and potentiostatic techniques

Cited by 13 publications

References 22 publications

On the Oxidation-Reduction Mechanism of the Cadmium Metal-Cadmium Hydroxide Electrode

On the Oxidation-Reduction Mechanism of the Cadmium Metal-Cadmium Hydroxide Electrode

Depolarization of the hydrogen evolution reaction on cadmium electrodes in alkaline media

Temperature Dependence of Iron and Cadmium Alkaline Electrodes

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