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Electroreduction of Molecular Oxygen on Poly‐Iron‐Tetraaminophthalocyanine Modified Electrodes
Author(s) -
Ramírez Galo,
Trollund Ejnar,
Isaacs Mauricio,
Armijo Francisco,
Zagal José,
Costamagna Juan,
Aguirre María J.
Publication year - 2002
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200204)14:7/8<540::aid-elan540>3.0.co;2-3
Subject(s) - monomer , chemistry , adduct , glassy carbon , polymer , electrolyte , supporting electrolyte , oxygen , sodium perchlorate , ligand (biochemistry) , inorganic chemistry , peroxide , perchlorate , oxygen reduction , polymer chemistry , electrode , electrochemistry , cyclic voltammetry , organic chemistry , ion , biochemistry , receptor
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.