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Electroreduction of Molecular Oxygen on Poly-Iron-Tetraaminophthalocyanine Modified Electrodes

✍ Scribed by Galo Ramírez; Ejnar Trollund; Mauricio Isaacs; Francisco Armijo; José Zagal; Juan Costamagna; María J. Aguirre

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
102 KB
Volume
14
Category
Article
ISSN
1040-0397

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✦ Synopsis

In this work we have investigated the electrocatalytic activity for O 2 reduction of monomeric (FePcTA) and polymeric (poly-FePcTA) iron tetraaaminophthalocyanine, deposited on glassy carbon. The activity of the electropolymerized ligand (poly-H 2 PcTA) was also investigated. Its activity is much lower than the activity of both monomeric and polymeric FePcTA. The electropolymerized FePcTA is more active and stable for O 2 reduction than the monomeric species. In contrast to other Fe-phthalocyanines, poly-FePcTA only catalyzes the two-electron reduction of O 2 to peroxide. Both monomeric and polymeric Fe species seem to form an adduct with oxygen and this causes a gradual deactivation, However at pH 5.85, using sodium perchlorate as electrolyte, the polymer does not lose its activity for O 2 reduction.

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