A g -1 . A 3 M KOH electrolyte was used. Within 3000 cycles at 2 A g -1 , the electrode material preserved 771.8 C g -1 . Defects like poor conductivity and volume expansion during charge and discharge processes were improved when oxygen vacancies were supplied to -Fe2O3 Nanooctahedrons. At a power density of 900 W kg -1 , the material had a specific capacity of 250.2 mA h g -1 and an energy density of 63 W h kg -1 . The results of this research provide new opportunities for its use in energy storage . and good cyclic stability with an efficiency of 93% after 1000 cycles show that it is successful when compared to CeO2/C (727.49 F g -1 ) or MoS2 (300.33 F g -1 ) at 1 A g -1 . Furthermore, this substance was said to be similarly suited for asymmetric super capacitors .