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    STUDIA CHEMIA - Issue no. 1 / 2008  
         
  Article:   ELECTROCHEMICAL INVESTIGATION OF SILVER / SILVER ION COUPLE REVERSIBILITY IN CHOLINE CHLORIDE - UREA BASED IONIC LIQUID.

Authors:  LIANA ANICAI, ANCA COJOCARU, ANDREEA FLOREA, TEODOR VISAN.
 
       
         
  Abstract:   Cyclic voltammetry and electrochemical impedance spectroscopy were used for studying both cathodic and anodic processes on Pt electrode in an ionic liquid as electrolyte support at 700C temperature. Air and water stable solutions containing Ag ion (0.14M, 0.282M and 0.565M AgNO3) are based on choline chloride (ChCl) and urea (1: 2) mixtures. Voltammograms were recorded using scan rates in 10-200 mV/s range. It is shown that the Ag /Ag couple on Pt electrode exhibits almost reversible behavior in ChCl-urea electrolyte support at 700C, with diffusion control of cathodic process and a stripping anodic process. The diffusion coefficient of Ag+ ion was estimated. Impedance of Pt electrode has been measured as a function of frequency for different overpotential values in the region of beginning and current peak Ag deposition. The non-uniformity of Ag deposited surface is one of the main factors determining the depressed shape of the impedance semicircle in Nyquist spectra. The values of fitting parameters for impedance data were calculated and the simulated curves have agreed with the experimental ones. Considerations regarding the use of Ag/Ag+ ion couple as reference electrode in electrochemical experiments with ChCl based ionic liquids are made.  
         
     
         
         
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