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    STUDIA CHEMIA - Ediţia nr.Special Issue 1 din 2009  
         
  Articol:   STUDY OF HYDROGEN PEROXIDE ELECTROSYNTHESIS ON ELECTROCHEMICALY MODIFIED GRAPHITE USING A WJRDE.

Autori:  SORIN-AUREL DORNEANU, PETRU ILEA.
 
       
         
  Rezumat:  The hydrogen peroxide electrosynthesis by partial reduction of oxygen represents an attractive alternative to the anthraquinone process. The result presented in this paper show that the two steps electro-activation of a graphite electrode, consisting in the oxidizing of the surface followed by the partial reduction of the active sites generated upon oxidation, induces an improvement of hydrogen peroxide electrosynthesis efficiency. Because the stability of the generated active sites is limited, a special programmable cyclic multi-step technique was used and the experimental parameters were optimized for a rectangular shape applied potential. In order to understand the electrosynthesis mechanism and to optimize the electro-activation potentials, cyclic hydrodynamic voltammetry studies were performed. For all the measurements, a wall-jet ring disk electrode was used.

Keywords: oxygen reduction, hydrogen peroxide electrosynthesis, electrochemical activation, graphite.
 
         
     
         
         
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