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    STUDIA CHEMIA - Issue no. 1-2 / 1999  
         
  Article:   ABOUT THE POSSIBLE SHAPES OF THE EXPERIMENTAL VOLTAMMOGRAMS OBTAINED BY APPLYING THE VOLTAMMETRY WITH LINEAR SCANNING OF THE POTENTIAL TO REDOX UNIELECTRODES.

Authors:  NICOLAE BONCIOCAT.
 
       
         
  Abstract:  In this paper, a theoretical analysis of the shapes that the experimental voltammograms obtained by applying the direct linear voltammetry to redox unielectrodes may have, has been carried out. The analysis is based on a recently deduced ordinary differential equation describing, by its solutions, the experimental voltammograms. From this analysis has resulted that in the case of quasireversible redox reactions, although at an unielectrode occurs only one redox reaction 0 + e  R, the experimental voltammogram may present, excepting the normal peak (cathodic, or anodic), two additional peaks, one before, the second after, the normal one; such voltammograms may appear only if some restrictive conditions regarding the values of the symmetry factor  and of the ratio r=(DO/DR)1/2(cO/cR) are fulfilled. Thus, the appearance of a succeeding peak after the normal one doesn’t mean that at interface occurs a second electrode reaction, or that the electrode redox reaction occurs in two steps, and in order to give a correct answer one must change the quasireversible kinetic behaviour of the electrode reaction in a reversible kinetic behaviour, by adequately changing the values of cO, cR (and thus of r), respective of the scanning rate v.  
         
     
         
         
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