Journal of Solid State Electrochemistry

, Volume 9, Issue 1, pp 21–29 | Cite as

Effect of film thickness on the electro-reduction of molecular oxygen on electropolymerized cobalt tetra-aminophthalocyanine films

  • Jorge Pavez
  • Maritza Páez
  • Armelle Ringuedé
  • Fethi Bedioui
  • José H. Zagal
Original Paper


We studied the electrocatalytic activity of cobalt tetra-aminophthalocyanine (CoTAPc) for the reduction of molecular oxygen (O2) on adsorbed monomeric and on electropolymerized films of different thicknesses on glassy carbon (GC) electrode. The polymeric films, denoted poly-CoTAPc, were first characterized by electrochemical impedance spectroscopy and it appears that the types of phenomena revealed to be occurring depend less on the film thickness in basic than in acid media. For O2 reduction, the results showed that poly-CoTAPc is more active than the monomeric CoTAPc adsorbed on GC. Indeed, rotating ring-disk electrode data showed that polymeric CoTAPc promotes the four-electron reduction of O2 to water in parallel to a two-electron reduction to give peroxide. On monomeric and thin films of poly-CoTAPc, a two-electron reduction mechanism predominates. In basic media the activity increases very slightly with thickness, whereas in acid media this increase is more pronounced. This parallels the observed behavior revealed by electrochemical impedance spectroscopy.


Polymerized cobalt tetra-aminophthalocyanine Oxygen reduction Film thickness Electrochemical impedance spectroscopy Electrocatalysis 



Financial support from Conicyt (Chile)/DRI-CNRS and Fondecyt Grant 8010006 is acknowledged. J.P. is grateful to financial support of Fondecyt Grant 2990110.


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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Jorge Pavez
    • 1
    • 3
  • Maritza Páez
    • 1
  • Armelle Ringuedé
    • 2
  • Fethi Bedioui
    • 2
    • 4
  • José H. Zagal
    • 1
  1. 1.Departamento de Química de los Materiales, Facultad de Química y BiologíaUniversidad de Santiago de ChileSantiagoChile
  2. 2.Laboratoire d’Electrochimie et Chimie Analytique, UMR CNRS-ENSCP 7575Ecole Nationale Supérieure de Chimie de ParisParis Cedex 05France
  3. 3.Departamento de Fisica, Facultad de CienciaUniversidad de Santiago de Chile and Center for Advanced Interdisciplinary Research in Materials CIMATSantiagoChile
  4. 4.Laboratoire de Pharmacologie Chimique et génétique, FRE CNRS-ENSCP no. 2463, U INSERM 640Ecole Nationale Supérieure de Chimie de ParisParis Cedex 05France

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