Oxygen electrocatalytic reduction on glass-carbon electrodes coated with polyporphyrin films based on metal complexes of 5,10,15,20-tetrakis(3-aminophenyl)porphyrin

Abstract

Carbon-based materials are widespread and promising in areas such as electrochemical and electrocatalytic power generation and can be excellent choices for use as electrode substrates. To increase the efficiency of using carbonaceous materials, the surface of the electrodes is modified with metal complexes of phthalocyanines and porphyrins with electrocatalytic properties. In this work polyporphyrin coatings were obtained on a glassy carbon electrode based on individual metal complexes of 5,10,15,20-tetrakis(3-aminophenyl)porphyrin and a composite based on two metal complexes Fe and Mn. Polymerization was carried out by the electrochemical method in the region of positive values of the potential 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 porphyrins, which suggests the presence of a synergistic effect. Based on the results of our research, we propose potential directions for the creation of electrodes based on glassy carbon modified with polyporphyrins for electrocatalytic oxygen reduction.