ISSN:
1572-8838
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Electrical Engineering, Measurement and Control Technology
Notes:
Abstract Low faradaic yields of Pb were found when electrolysing melts containing PbSO4 in solvents of either LiCl-KCl eutectic or Li2SO4-K2SO4-Na4SO4 eutectic and employing low current densities. For all current densities employed, the decrease in current efficiency became greater as the lead sulphate concentration was increased but the influence of other sulphates was less pronounced. From studies of the reaction of lead with the melt and a chronopotentiometric study of cathodic processes, we have found the following two reactions occur: (a) Cathodic deposition of lead by the reversible reaction Pb2+ +2e⇌Pb (b) Secondary non-electrochemical reaction of the electrodeposit 4Pb+5PbSO4→PbS+4PbO.PbSO4 The rate of the latter reaction is sufficient to account for the lowering in current efficiencies. No evidence could be found to support direct reduction of the sulphate anion.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01119466
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