Hydrogen production during zinc deposition from alkaline zincate solutions

The determination of the amount of H produced during the electrodeposition of Zn from alkaline zincate solutions was carried out using the rotating ring--disc electrode (RRDE) technique. The experimental conditions for which the RRDE technique offers reliable results are discussed. Hydrogen producti...

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Bibliographic Details
Published in:Journal of applied electrochemistry 1988-11, Vol.18 (6), p.799-806
Main Authors: EINERHAND, R. E. F, VISSCHER, W. H. M, BARENDRECHT, E
Format: Article
Language:English
Subjects:
Adsorption
Chemistry
Electrochemistry
Electrodeposition
Exact sciences and technology
General and physical chemistry
Study of interfaces
Transport phenomena
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Summary:The determination of the amount of H produced during the electrodeposition of Zn from alkaline zincate solutions was carried out using the rotating ring--disc electrode (RRDE) technique. The experimental conditions for which the RRDE technique offers reliable results are discussed. Hydrogen production during Zn deposition was studied for a range of cathodic (disc) current densities (20-500 A m exp --2 ) and electrolyte compositions (1-7M KOH, 0.01-0.2M zincate). It was found that an increasing amount of H was formed with increasing (disc) current density and decreasing KOH and zincate concentration. The impact of H formation during the charging process on nickel oxide/Zn secondary battery performance is expected to be small. It is concluded that in battery electrolytes (8M KOH, 1M zincate) H is formed chiefly by corrosion of the Zn electrode rather than by electrochemical formation during the electrochemical reduction of Zn. 19 ref.--AA
ISSN:0021-891X
1572-8838
DOI:10.1007/BF01016034