[en] In this study, uniform iron manganese trioxide (FeMnO₃) microspheres were characterized as electrode for supercapacitor applications. The microspheres were synthesized by hydrothermal method in the presence of different molar ratios of sucrose. X-ray diffraction pattern confirmed that the obtained microsphere has body-centered lattice structure of space group 12₁3(199). The Raman peak observed at 640 cm⁻¹ might be attributed to the stretching mode of vibration of Mn–O bonds perpendicular to the direction of MnO₆ octahedral double chains. The photoluminescence peak at the 536 nm corresponded to Fe²⁺ ions in FeMnO₃ lattice point of body-centered cubic structure. The characteristic strong infrared (IR) bands observed at 669 cm⁻¹ corresponded to Fe–O stretching. The electrochemical characterization of the obtained FeMnO₃ products could be understood by carrying out cyclic voltammeter, electroimpedance spectra, and galvanostatic charging and discharge studies in a three-cell setup that demonstrates the exceptional specific capacitance of 773.5 F g⁻¹ at a scan rate of 10 mV s⁻¹ and 763.4 F g⁻¹ at a current density of 1 A g⁻¹. (paper)