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    STUDIA CHEMIA - Issue no. Special%20Issue%201 / 2009  
         
  Article:   ELECTRODEPOSITION OF BISMUTH, TELLURIUM AND ANTIMONY FROM IONIC LIQUIDS BASED ON CHOLINE CHLORIDE AND UREA AS THERMOELECTRIC FILMS.

Authors:  ANCA COJOCARU, TEODOR VISAN. 		 
       
         
  Abstract:  The aim of this work was to study the electrodeposition of Bi, Sb and Te as singular components of thermoelectric films using an ionic liquid medium (choline chloride + urea; 1:2 molar mixture). Ionic complex species (BiCl4-, SbCl4- and TeCl62-) were supposed as participant species at the cathodic process, and were prepared by dissolving BiO2, SnCl3 and TeO2 in 0.5 - 10 mM concentrations. Cyclic voltammograms on Pt exhibited a single couple of reduction/ oxidation peaks at all scan rates (2 – 200 mVs-1) and temperatures (40 – 85 0C). Values of diffusion coefficients and activation energy for diffusion were also estimated. Nyquist and Bode spectra, obtained from electrochemical impedance measurements, proved the diffusion control. By fitting the experimental data with an equivalent electrical circuit of modified Randles type the differences in double layer capacitances and also in charge transfer resistances for the three cathodic processes of Bi, Sb or Te ions were evidenced.

Keywords: electrodeposition, bismuth, antimony, tellurium, cyclic voltammetry, electrochemical impedance spectroscopy
  
         
     
         
         
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