Electrochemical and transport properties of ethaline containing copper and tin chloride

S. Ghosh, K. Ryder, S. Roy

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Electrochemical and transport properties were measured for hydrated chloride salts of copper and tin in ethaline, which is a 1 : 2 ratio of choline chloride and ethylene glycol. Density, viscosity and conductivity for ethaline melts with different salt concentrations have been measured for temperatures between 293 and 328 K. The change in formal potential with changing metal ion concentration has been determined to evaluate changing speciation in the ionic liquid. Cyclic voltammetry has been carried out to ascertain the reduction potential and diffusion coefficient of the reacting species. For pure ethaline the density was found to decrease by <5% with increase in temperature. On the other hand, the viscosity was found to decrease and conductivity was found to increase by 65% over the same temperature range. The inclusion of metal salts in ethaline had negligible effect on these parameters. Potential measurements showed that copper was reduced through a two-step mechanism and Sn was reduced via a two electron transfer route. The diffusion coefficient values for Cu 2+ and Sn2+ species were 1·22 × 10 -11 and 1·96 × 10-11 m2 s -1 respectively.

Original languageEnglish
Pages (from-to)41-46
Number of pages6
JournalTransactions of the Institute of Metal Finishing
Volume92
Issue number1
Early online date19 Dec 2013
DOIs
Publication statusPublished - 31 Jan 2014

Keywords

  • choline chloride
  • copper
  • electrodeposition
  • ethaline
  • ionic liquids
  • tin

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