When comparing the cyclic voltammograms (CVs) of polyaniline (PN) and its composites, it is evident that PNFZ has the highest redox activity (Figure ). The electrochemical charge storage capability was compared for each material by determining its specific capacitances from the cyclic voltammograms. The highest specific capacitance of 870 F g -1 was obtained for PNZF at a scan rate of 5 mV s -1 . For PNF, PNZ, and PN lower specific capacitances of 485, 320 and 317 F g -1 were obtained, respectively. Thus, incorporating ZnFe2O4 resulted in a significant increase in charge storage capability compared to the other electrode materials. As the scan rate increases, all composites' specific capacitances drop steadily. This trend occurs due to the slow mass transport of electrolyte ions inside the porous active material. Consequently, the charge storage capability is lower (Figure ). To further investigate the charge storage mechanism occurring at the electrode-electrolyte interface, the current dependence on scan rate was analyzed using equation ( ) .