The estimation of the coulombic efficiency of zinc electrodeposition by measurement of current efficiencies at a rotating ring disc electrode |
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| Authors: | E. J. Frazer I. C. Hamilton |
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| Affiliation: | (1) Division of Mineral Chemistry, CSIRO Institute of Energy and Earth Resources, PO Box 124, 3207 Port Melbourne, Victoria, Australia;(2) Department of Chemistry and Biology, Footscray Institute of Technology, PO Box 64, 3011 Footscray, Victoria, Australia |
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| Abstract: | The rotating ring disc electrode (RRDE) offers a simple method for the determination of the current efficiency (CE) of zinc electrodeposition in acidic zinc sulphate electrolytes. The hydrogen evolved during zinc deposition can be detected at the ring. This allows estimation of the current due to hydrogen formation at the disc and hence CE for electrodeposition of zinc can be calculated. Investigations of the conditions under which reliable measurements of CE can be obtained are described. A correlation between CE, determined using the RRDE, and the coulombic efficiency (QE), determined by weighing the zinc deposit obtained after 2 h electrodeposition at constant current, is established for a range of electrolyte compositions. It is suggested that measurement of CE at a Pt–Zn RRDE provides an efficient means of estimating QE for zinc electrolytes. |
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