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    STUDIA CHEMIA - Issue no. 2 / 2004  
         
  Article:   SPINEL OXIDE COMPOSITE ELECTRODES.II. PREPARATION, PHYSICO-CHEMICAL PROPERTIES AND ELECTROCHEMICAL BEHAVIOUR OF CUCO2O4 AND LI0.1CU0.9CO2O4 DEPOSITED ON NI ELECTRODES.

Authors:  OLIVIA LAZAR, PETRU - IOAN ILEA, BENOIT MARSAN, IONEL CĂTĂLIN POPESCU. 		 
       
         
  Abstract:  CuCo2O4 and Li0.1Cu0.9Co2O4 deposited on Ni electrodes (Ni/CuCo2O4, Ni/Li0.1Cu0.9Co2O4) were prepared by thermal decomposition of nitrate precursors deposited on Ni grating. The physico-chemical characterization showed that these oxides have a spinel structure. In the anodic potentials domain, cyclic voltammetry measurements performed on both Ni/CuCo2O4 and Ni/Li0.1Cu0.9Co2O4 electrodes showed the presence of the Co(IV/III) quasi-reversible redox transition, while in the cathodic potentials domain the Cu(II/I) transition was observed. The highest roughness factor (666) was obtained for Ni/Li0.1Cu0.9Co2O4 electrode. The heterogeneous electron transfer rate constant values pointed out that the Co(IV/III) transition is faster on Ni/Li0.1Cu0.9Co2O4 electrode.  
         
     
         
         
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