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Hydrogen production during zinc deposition from alkaline zincate solutions

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Abstract

The determination of the amount of hydrogen produced during the electrodeposition of zinc 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 zinc deposition was studied for a range of cathodic (disc) current densities (20–500 A m−2) and electrolyte compositions (1–7 M KOH, 0.01–0.2 M zincate). It was found that an increasing amount of hydrogen was formed with increasing (disc) current density and decreasing KOH and zincate concentration. The impact of hydrogen formation during the charging process on nickel oxide/zinc secondary battery performance is expected to be small. It is concluded that in battery electrolytes (8 M KOH, 1 M zincate) hydrogen is formed chiefly by corrosion of the zinc electrode rather than by electrochemical formation during the electrochemical reduction of zinc.

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Authors and Affiliations

  1. Laboratory for Electrochemistry, Department of Chemical Technology, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands

    R. E. F. Einerhand, W. H. M. Visscher & E. Barendrecht

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  1. R. E. F. Einerhand
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  2. W. H. M. Visscher
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  3. E. Barendrecht
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Einerhand, R.E.F., Visscher, W.H.M. & Barendrecht, E. Hydrogen production during zinc deposition from alkaline zincate solutions. J Appl Electrochem 18, 799–806 (1988). https://doi.org/10.1007/BF01016034

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  • DOI: https://doi.org/10.1007/BF01016034

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