Facile synthetic fabrication of iron oxide particles and novel hydrogen superoxide supercapacitors

A facile approach for the synthetic fabrication of iron oxide (Fe3O4) particles is presented and their potential application towards energy storage (as an electrode material within a supercapacitor) is explored. The Fe3O4 asymmetric supercapacitor is found to deliver a maximum specific capacitance of ∼120 F g−1 at a current density of 0.1 A g−1 in an aqueous electrolyte solution (3M KOH) retaining 93.70% of its initial capacity over 1000 cycles. Additionally, an iron based hydrogen superoxide [FeO(OH)] supercapacitor is readily fabricated and is found to exhibit a maximum specific capacitance of ∼400 F g−1 at a discharge current of 0.1 A g−1 in a 3M KOH solution.