Abstract:
This paper reports the electrodeposition of Pb films on Pt using ionic liquids based on choline chloride: ethylene glycol eutectic mixture (ChCl-EG, 1:2 moles) in the 45-65°C temperature range. Lead ion (as PbCl₂) was dissolved in ChCl:EG ionic liquid at concentrations in the range of 1-5 mM. The mechanism of Pb electrodeposition was investigated by cyclic voltammetry and electrochemical impedance spectroscopy. Cyclic voltammograms show a single cathodic peak of Pb deposition, with an amplitude increased with Pb²⁺ concentration, scan rate or temperature. Nyquist and Bode impedance spectra show differences in Pt behavior due to its polarization at various cathodic potentials.