Cyclic Voltammetry in Solutions of Aluminum Bromide and KBr in Aromatic Hydrocarbons

M. Elam, E. Peled, E. Gileadi

Research output: Contribution to journalArticlepeer-review

Abstract

The electrochemical behavior of dilute solutions of SnBr2 and PbBr2 in a nonpolar solvent system consisting of solutions of 1.0M Al2Br6 and 0.80M KBr in ethylbenzene was studied. Cyclic voltammograms show well defined peaks for the deposition and dissolution of the divalent metal. Oxidation to the tetravalent state could not be detected in the available potential region. The diffusion coefficients were 1.1 × 10–6 cm2/sec for lead and 2.7 × 10–6 cm2/sec for tin. Lead ions inhibit the electrodeposition of aluminum while tin ions seem to have little or no effect. An overpotential associated with initial nucleation on a platinum electrode is observed for both metals and electrodeposition does not start until η reaches a value of about 30–40 mV. Formation of a thermodynamically unstable Al/Pb alloy at sufficiently cathodic potentials in solutions containing PbBr2 is indicated.

Original languageEnglish
Pages (from-to)585-590
Number of pages6
JournalJournal of the Electrochemical Society
Volume130
Issue number3
DOIs
StatePublished - Mar 1983

Keywords

  • electrodeposition
  • nucleation
  • overpotential
  • reversibility

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