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    STUDIA CHEMIA - Issue no. 2 / 2004  
         
  Article:   SPINEL OXIDE COMPOSITE ELECTRODES.I. CUCO2O4 AND LI0.1CU0.9CO2O4 CARBON PASTE ELECTRODES FOR H2O2 OXIDATION/REDUCTION.

Authors:  OLIVIA SERDAN, PETRU - IOAN ILEA, BENOIT MARSAN, IONEL CĂTĂLIN POPESCU. 		 
       
         
  Abstract:  A new method to obtain composite electrodes based on CuCo2O4 and Li0.1Cu0.9Co2O4 spinel-type oxides, is presented. Both oxides were prepared as powders by thermal decomposition of nitrate precursors. In the anodic potentials domain, cyclic voltammetry measurements performed on CuCo2O4-carbon paste electrodes (CPEs) showed the presence of Co(IV/III) and Co(III/II) quasi-reversible redox transitions, while in the cathodic potentials domain Cu(II/I) and Cu(I/0) transitions were observed. Contrarily, at Li0.1Cu0.9Co2O4-CPEs, only Co(III/II) transition was noticed. The electrochemical response of both electrodes, recorded in the presence of H2O2, proved a moderate electrocatalytic activity toward H2O2 oxidation/reduction.  
         
     
         
         
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