Electrochemical characteristics of capacitor systems formed on chemical modified carbon bases

Abstract

Influence of chemical modification of the activated carbon (AC) material on its specific capacity is foud out with the use of methods of impedance spectroscopy, cyclic voltammetry and chronopotentiometry. As shown, a general capacity is the sum of two components, namely, double electric layer (DEL) capacity and pseudocapacity, thus the deposit of the last is insignificant (8-14%). The alloing with rare-earth metals and their compounds results in in the rise of cpecific capacity of AC. Probably, the principal reason of such growth is transformation of valence bond of carbon material due to introduction of the additional electron states from the implanted metals. As a result. the considerably greater amount of ions (especially, positive ones) will take part in DEL forming, and, consequently, will predetermine prowth of specific capacity.