Electrocatalytic Reduction of Oxygen on Glassy Carbon Electrodes Coated with Polyporphyrin Films Based on 5,10,15,20-Tetrakis(3-aminophenyl)porphyrin Metal Complexes

Carbon materials are widespread and promising in such fields as electrochemical and electrocatalytic generation of electricity and can be excellent choices for use as electrode substrates. To increase the efficiency of using carbon materials, the electrode surfaces are modified with phthalocyanine and porphyrin metal complexes that exhibit electrocatalytic properties. In this study, polyporphyrin coatings based on individual complexes of 5,10,15,20-tetrakis(3-aminophenyl)porphyrin with metals and composites based on its complexes with two metals Fe and Mn are deposited on a GC electrode. The polymerization is carried out by the electrochemical method in the region of positive potentials in the potentiodynamic mode. Electrodeposited polyporphyrin coatings have a developed surface and exhibit catalytic activity in the reaction of oxygen electroreduction. The results of evaluating the catalytic activity of polyporphyrins obtained by various methods are in good agreement with each other and indicate a higher catalytic activity of a composite based on two metal complexes compared to films of individual porphyrin complexes, which suggests the presence of synergism. On the basis of the results of the study, we propose potential ways for the development of electrodes for electrocatalytic oxygen reduction from glassy carbon modified with polyporphyrins.