Home – Home – Jornals – Chemistry for Sustainable Development 2022 number 4

Nanostructured composite material is obtained on the basis of multiwall carbon nanotubes filled with the products of thermal decomposition of cobalt complexes with disodium salt of ethylenediaminetetraacetic acid (Trilon B) - CoH₂Y. The performed characterization of the composite shows that the content of cobalt in it is consistent with that assigned during the synthesis, and sodium chloride obtained as a by-product is almost completely removed by washing. The consistent results of cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance measurements reveal a noticeable increase in the electrical capacity of the carbon matrix in the region of low scanning rates with the introduction of a filler (up to 1.8 times at a rate of 10 mV/s), which is associated with the occurrence of relatively inertial electrode Red-Ox processes like CoO ↔ CoO _х (OH) _у ↔ Со₂О₃ ↔ Со₃О₄ under these conditions. At high potential scanning rates, the introduction of small amounts of filler (less than 5%) has practically no effect on charge accumulation. With an increase in filler content, a symbate decrease in the capacity is observed, which is likely associated with an increasing blocking of the nanotube surface and a decrease in the capacity due to the formation of an electric double layer, while the Red-Ox reactions with the participation of the filler do not occur under these conditions due to relatively low rates. The results of impedance and galvanostatic measurements are consistent with this model.