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    STUDIA CHEMIA - Issue no. 2 / 2012  
         
  Article:   SPECTROELECTROCHEMICAL STUDIES OF CARBON-BASED SCREEN-PRINTED ELECTRODES MODIFIED WITH POROUS GELS OF ZIRCONIUM, CLAYS AND CALIXARENES.

Authors:  NICOLAE BONCIOCAT. 		 
       
         
  Abstract:  Electrochemical impedance spectroscopy (EIS) was applied in order to analyze the properties of carbon based screen-printed electrodes modified with clay, Zr alkoxide (?) or calixarene. Parametric equations for Nyquist diagrams applicable in extreme domain of frequencies were used in the case of clay or Zr alkoxide modifiers. The equations lead to an analysis of the curves around the frequency of 0.1 Hz. The terms expressing diffusion and charge transfer respectively, were calculated for the proposed electrodes. For comparison Nova 1.6 AUTOLAB soft was used to determining the electrochemical terms involved in Warburg classical circuits.

Keywords: screen-printed electrodes, electrochemical impedance spectroscopy, clay, zirconium oxide nanoporous gel, calixarene 		 
         
     
         
         
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