Electrodeposition of palladium-silver in a Lewis basic 1-ethyl-3- methylimidazolium chloride-tetrafluoroborate ionic liquid

Chia Cheng Tai, Fan Yin Su, I. Wen Sun

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54 Citations (Scopus)

Abstract

The electrodeposition of palladium-silver alloys was investigated in a basic 1-ethyl-3-methylimidazolium chloride/tetrafluoroborate ionic liquid containing Pd(II) and Ag(I). Cyclic voltammetry experiments showed that the reduction of Ag(I) occurs prior to the reduction Pd(II). Both electrodeposition processes require nucleation overpotential. Energy-dispersive spectroscopy data indicated that the composition of the Pd-Ag alloys could be varied by deposition potential and concentrations of Pd(II) and Ag(I) in the solution. The Pd content in the deposited Pd-Ag alloy increased with decreasing deposition potential and the Pd mole fraction in the plating bath. At potentials where the deposition of both Pd and Ag was mass-transport limited, the Pd/Ag ratio in the electrodeposited alloys was slightly less than the Pd(II)/Ag(I) ratio in the ionic liquid due to the smaller diffusion coefficient of Pd(II). Scanning electron micrographs of the electrodeposits showed that in general, the Pd-Ag alloys were nodular and become more compact upon increasing the temperature up to 120 °C.

Original languageEnglish
Pages (from-to)5504-5509
Number of pages6
JournalElectrochimica Acta
Volume50
Issue number28
DOIs
Publication statusPublished - 2005 Sep 30

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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