Catalysts for oxygen electroreduction in alkaline medium based on carbon nanotubes modified with urea and phthalocyanines of iron, cobalt and palladium

Catalysts for oxygen reduction in the alkaline electrolyte based on multi-walled carbon nanotubes modified with urea and phthalocyanines of iron, cobalt and palladium were synthesized and studied. Physicochemical studies of the surface of the synthesized materials were carried out using porosimetry, Raman spectroscopy, X-ray phase analysis and X-ray photoelectron spectroscopy. The catalyst doped with metal phthalocyanines (MWCNT(Urea)_CoPc_FePc_Pd) has the largest surface area. It can be assumed that the high specific surface area of this catalyst is obtained due to the formation of new layers of hierarchical carbon on the surface of the nanotubes during high-temperature pyrolysis. It was established that metal phthalocyanines are nitrogen dopants in the structure of carbon nanotubes. The electrocatalytic properties of the synthesized catalysts in the oxygen reduction reaction were studied using the voltammetric method.