NMR Study of Complex Ions in the Aqueous ZnO–KOH System

Newman, Gerald H.; Blomgren, G. E.

doi:10.1063/1.1697204

Cited by 43 publications

(40 citation statements)

References 16 publications

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“…By emf measurements, Dirkse has shown that this species is the complex tetrahydroxyl anion, Zn(OH)4--, an interpretation supported by recent Raman and infrared, as well as NMR, studies (2,4,5).…”

Section: General Electric Research and Development Center Schenectadmentioning

confidence: 85%

The Anodic Dissolution and Passivation of Zinc in Concentrated Potassium Hydroxide Solutions

Powers

Bréiter

1969

J. Electrochem. Soc.

179

144

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In this study, mainly two sets of experiments were carried out to obtain a better understanding of the tendency of the alkaline zinc electrode to passivate. Either photomicrographs of the electrode surface were taken in‐situ at different potentials during an anodic voltage sweep or the two components of the electrode impedance were measured with a small signal of superimposed 1000 Hz A.C. The course of the passivation was found to depend strongly on the convective conditions in the electrolyte near the zinc electrode. The conditions for the formation of two different types of solid films have been defined and their effects on the current‐potential curve have been determined. Type I film is white, loose, and flocculent. It forms in the absence of convection by precipitation from a supersaturated layer of zincate near the surface. When the conditions for supersaturation are largely removed by stirring, the formation of the type II film can be observed. The latter is more compact and appears to form directly at the surface rather than by precipitation. Its color can range from light gray to black depending on the potential and time of formation. The type II film is considered responsible for the transition from the active to the passive state of zinc in alkaline solution.

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Section: General Electric Research and Development Center Schenectadmentioning

confidence: 85%

The Anodic Dissolution and Passivation of Zinc in Concentrated Potassium Hydroxide Solutions

Powers

Bréiter

1969

J. Electrochem. Soc.

179

144

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“…The very short-lived potential plateau, observed at high current densities, may well be indicative of this step. This stage is followed by equilibria Zn (OH) 2ad ~ Zn (OH) 2diss [5] Zn(OH) 2diss -F-n OH-~ Zn (OH)2+,, [6] If either [5] or [6] is rate controlling, and if a firstorder process, then, assuming the validity of [3] and [4], kf and kr may be calculated using the data of Table IV. In potassium hydroxide, k I = 0.98, kr ~ 0.9 sec -1.…”

Section: Discussionmentioning

confidence: 99%

The Electrochemical Behavior of Zinc in Alkaline Media

Elder¹

1969

J. Electrochem. Soc.

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The electrochemical behavior of horizontally disposed planar zinc in 30% (6.9M) potassium hydroxide, alone and saturated with zinc oxide at 25°C, has been investigated in a controlled manner, using both galvanostatic and potentiostatic techniques. The anodic characteristics have been interpreted in terms of a kinetically controlled process preceding a diffusion step. The cathodic behavior of oxidized zinc has been interpreted in terms of a complex two‐state process, involving the formation of a bound zinc hydroxide, followed by a reduction of both the adsorbed species and the soluble zincate to zinc metal.

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“…Chemical shifts of ZnO dissolved in different ratios of KOH to ZnO have been studied [109]. Due to very rapid chemical exchange among the proton containing species, only one sharp peak was observed.…”

Section: Agreement Between Experimental and Calculated Values Of The mentioning

confidence: 99%