Comparative results of electrochemical investigations of polymeric composit
es with different contents of carbon black and graphite activated with ruth
enium oxides are presented. Electrochemical impedance measurements (EIS), e
nabling determination of electrical and electrochemical properties of polym
eric composites, were accompanied by potential measurements performed durin
g a 21-day galvanostatic polarization at 5 A m(-2) current density. Gravime
tric measurements were also made to determine the extent of anode consumpti
on. It was demonstrated that the presence of ruthenium oxides characterised
by high electrocatalytic activity in the polymeric composites causes an im
provement in the polarisation characteristics, a decrease in the value and
improvement in stability of the potential during long-term operation, and a
lso a decrease in the anode consumption, as compared to composites exclusiv
ely containing activated carbon black.