Concentration-dependent electrochemical supercapacitive performance of Fe2O3

► Hexagonal rhombo-centered crystal structure of Fe2O3 is having continuous semi-porous morphology. ► Mixed capacitive behavior exhibits double layer and pseudo origin. ► Material stabilizes so fastly up to 20 cycles. ► Material shows maximum 92% efficiency. ► Good capacitive behavior with low internal resistance 0.6 Ω/cm2 is obtained.