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    STUDIA CHEMIA - Ediţia nr.2 din 2011  
         
  Articol:   GRAPHITE ELECTRODE ELECTROACTIVATED BY POTENTIOSTATIC MULTI-SEQUENCE TECHNIQUES FOR HYDROGEN PEROXIDE ELECTROSYNTHESIS.

Autori:  CODRUŢA AURELIA VLAIC, SORIN-AUREL DORNEANU, PETRU ILEA. 		 
       
         
  Rezumat:  Studies concerning the hydrogen peroxide electrosynthesis carried out by cyclic hydrodynamic voltammetry (CHV), revealed that graphite anodisation followed by a sequence of surface partial reduction has a positive effect upon the HPE efficiency. In order to improve the promising results obtained by CHV a set of original multi-sequences techniques for repetitive potentiostatic graphite electroactivation for HPE efficiency improvement was designed. The new electroactivation protocols were tested in hydrodynamic controlled conditions using a Pt-graphite wall-jet ring disk electrode. The potentiostatic measurements using different shapes of the applied signal allowed us to identify the possible processes involved in the electroactivation and production sequences. Experimental optimisation of the original potentiostatic electroactivation technique of the graphite cathode was carried out leading to a decrease of the electrical energy consumption.

Keywords: hydrogen peroxide electrosynthesis, graphite electroactivation, wall-jet ring disk electrode, multi-sequence technique 

 
         
     
         
         
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