Four-electron reduction of oxygen electrocatalyzed by a mixture of porphyrin complexes onto glassy carbon electrode

Leyla Gidi, Camila Canales, María J. Aguirre, Francisco Armijo, Galo Ramírez*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


In this work a new composite electrode for the electrocatalytic reduction of oxygen (ORR) is presented. For this purpose, glassy carbon electrodes (GC) were modified with CoII and FeIII octaethylporphyrins. The system that presents the highest electrocatalytic activity towards ORR is GC modified with a mixture of both octaethylporphyrins in 1:1 volume proportion (GC Co-Fe 1:1) over the GC electrodes modified with CoII and FeIII octaethylporphyrins separately. This modified electrode can reduce O2 through two reduction processes (four electrons each), by the generation of H2O as final product, in two active sites of different chemical nature. All the electrodic systems were morphologically characterized by atomic-force microscopy (AFM) and electrically characterized by electrochemical impedance spectroscopy (EIS). It was found that the electroactive system (GC Co-Fe 1:1) presents high differences on its surface and performs the lowest charge transfer resistance (Rct) in comparison to the rest of the modified systems and GC itself.

Original languageEnglish
Pages (from-to)1666-1682
Number of pages17
JournalInternational Journal of Electrochemical Science
Issue number2
Publication statusPublished - 2018

Bibliographical note

Funding Information:
ACKNOWLEDGEMENTS The authors would like to acknowledge the financial support provided by FONDECYT Project No.: 1170340 and No.: 1160324. M.J.A. acknowledges Dicyt-Usach financial support.

Publisher Copyright:
© 2018 The Authors.

Other keywords

  • Dioxygen reduction
  • Electrocatalysis
  • Modified electrode
  • Porphyrin complex mixtures
  • Synergic effect


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