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ISSN 1998-9539

Electrocatalytic Reduction of Oxygen on Graphitized Carbon Electrode Modified with 5,15-Bis(pyrid-4-yl)-3,7,13,17-tetramethyl- 2,8,12,18-tetraethylporphine and Its CuII, FeIII Complexes

Do Ngoc Minh, Nadezhda M. Berezina,@ Mikhail I. Bazanov, Aleksander S. Semeikin, and Aleksey V. Glazunov

Ivanovo State University of Chemistry and Technology, Research Institute of Macroheterocyclic Compounds, 153000 Ivanovo, Russia

@Corresponding author E-mail: sky_berezina@rambler.ru

 

DOI: 10.6060/mhc140714b
Macroheterocycles 2015 8(1) 56-64

 

The investigation of electrochemical properties of model electrodes with active layers containing 5,15-bis(pyrid-4-yl)-3,7,13,17-tetramethyl-2,8,12,18-tetraethylporphine (H2(4-Py)2TMeTEtP) and its Cu(II), Fe(III) complexes in 0.1 M KOH aqueous solution was carried out by cyclic voltammetry (CV). The potential ranges of oxidation-reduction processes related to the transformations of the porphyrin macrocycle, pyridyl moiety and central metal ion were established. The electrochemical parameters of oxygen electroreduction reaction (effective number of electrons - n, transfer coefficient - α, maximum potential - Eр, current density - j) were determined. It was shown that the electroreduction process of oxygen on electrode with dipyridylporphyrin and its Fe(III) complex occurs via 2-electron mechanism to give hydrogen peroxide ion, and for Cu(II) complex – via parallel-sequential pathway, including as 4-electron process with the rupture of the bond in molecular oxygen as 2-electron mechanism to give hydrogen peroxide ion (OHˉ and HO2ˉ).
 

 

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