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Electrodes modified using aggregated cobalt-porphyrin/polymer ligand systems were prepared and electrocatalytic activity for oxygen (O2) reduction was investigated physicochemically.The maximum value of water yield due to O2 four-electron reduction was 56 %.The apparent number of electrons involved in Oa reduction was 2.7 to 3 1.Two reactions due to O2 two-and four-electron reduction occurred on modified electrodes. Modification (adsorption) stability of the electrocatalyst system was over a few hours under hydrodynamic conditions.