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A novel electrosynthesis procedure was applied to prepare manganese-doped iron oxide (FeO) nanoparticles. The procedure involved depositing FeO nano-particles on a steel cathode from aqueous solution of (2 g/L) Fe(NO), (1 g/L) FeCl and (0.3 g/L) MnCl. Next the product was evaluated using X-ray diffraction (XRD), field emission electron microscopy (FE-SEM) and energy-dispersive X-ray (EDX). The final optimal product was found to contain 10 wt% of Mn and the average size of the spherical Mn-FeO nano-particles was determined to be 20 nm. Further analysis of the produced particles using VSM proved it to have super-paramagnetic behavior ( Ms = 47.25 emu g, Mr = 0.22 emu g, positive Mr = −0.703 emu g, negative Mr = −1.15 emu g, H = 4.84 G, positive H = 25.55 and negative H = 15.85 G). The nanoparticles were studied using electrochemical techniques of cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy, and it was found that the nanoparticles possess a specific capacitance value of 202.5 F g, and capacity maintain about 92.4% after 2000 cycles at 0.5 A g, which indicated the particles have excellent potential for use in supercapacitors. [ABSTRACT FROM AUTHOR]