Enhanced Electrocatalysis of the Oxygen Reduction Reaction Using Cobalt and Iron Porphyrin/Ionic Liquid Systems

Oxygen reduction reaction mediated by electrodes composed of graphite powder, octylpyridinium hexafluorophosphate as a binder, and cobalt and iron metal octaethylporphyrins is studied. Morphological and composition changes of the electrodic surfaces are observed employing the ionic liquid (IL) as a...

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Bibliographic Details
Published in:Energy technology (Weinheim, Germany) Germany), 2019-11, Vol.7 (11), p.n/a
Main Authors: Gidi, Leyla, Honores, Jessica, Arce, Roxana, Arévalo, M. C., Aguirre, M. J., Ramírez, Galo
Format: Article
Language:English
Subjects:
Cobalt
electrocatalysis
Electrochemical impedance spectroscopy
Electrochemistry
Hydrogen peroxide
Ionic liquids
Ions
Iron
metalloporphyrins
Oxygen
oxygen reduction
Oxygen reduction reactions
Porphyrins
Synergistic effect
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Summary:Oxygen reduction reaction mediated by electrodes composed of graphite powder, octylpyridinium hexafluorophosphate as a binder, and cobalt and iron metal octaethylporphyrins is studied. Morphological and composition changes of the electrodic surfaces are observed employing the ionic liquid (IL) as a binder by scanning electron microscopy along with X‐ray microanalysis. Cyclic voltammetry and electrochemical impedance spectroscopy studies indicate that both the ILs and porphyrins are capable of generating an electrocatalytic effect in terms of current and/or potential toward this reaction, as well as increasing the conductive ability of the systems, presenting a synergistic effect between the ILs and the porphyrins. Scan rate studies determine that with the mixing of Co–Fe porphyrins, an oxygen reduction close to four electrons, either directly or through the production of a hydrogen peroxide intermediate, is generated. Modified electrodes (graphite, ionic liquid (IL) and mixtures of Co and Fe‐porphyrins) as electrocatalysts towards the oxygen reduction reaction are presented. Electrodes are characterized by scanning electron microscopy, X‐ray microanalysis, cyclic voltammetry and electrochemical impedance spectroscopy. Systems show high electrocatalytic activity, presenting a synergic effect between IL and porphyrins. Electrodes with a mixture of Co‐Fe porphyrins can reduce via four electrons.
ISSN:2194-4288
2194-4296
DOI:10.1002/ente.201900698