▎ 摘　　要

NOVELTY - The method involves preparing (S100) an aqueous iron salt solution, and adjusting (S200) pH of the solution in range of 10-14 by adding an aqueous solvent i.e. ammonia, to the aqueous iron salt. The solution is stirred (S300) at low temperature, and centrifuged (S400). Crystalline iron oxide nanoparticles are obtained (S500) by vacuum-drying the centrifuging solution at the low temperature. The obtained iron oxide nanoparticles are laminated (S600) on a substrate. The substrate is selected from a group consisting of carbon nanotube (CNT), carbon nanofibers (CNF), virtual growth carbon fibers (VGCF), graphite, carbon air gel and graphene. The iron salt is iron chloride. USE - Method for manufacturing an electrode (claimed) for a metallic hybrid supercapacitor. ADVANTAGE - The method is simple and economical. The hybrid supercapacitor has high charge storage characteristics, excellent storage capacity and cycle stability. DESCRIPTION OF DRAWING(S) - The drawing shows the flow diagram of an electrode manufacturing method. (Drawing includes non-English language text). Aqueous iron salt solution preparing step (S100) Adjusting step (S200) Stirring step (S300) Centrifuge step (S400) Crystalline iron oxide nanoparticle obtaining step (S500) Laminating step (S600)