ABSTRACT Morphology of Mn 3 O 4 is tuned to the nanoparticles / nanorods / nanofiber if ratio of metal precursor to polymer is varied from 0.33:1 to 2:1 in electrospinning solution. The best optimized nanofiber of Mn 3 O 4 in terms of surface area, pore size and its distribution, and aspect ratio are obtained when equal amount of metal precursor and polymer (MN1:1) in electrospinning solution is taken, and sintered precisely at 1 °C min −1 . The structural, morphological and thermal characterizations are carried out by XRD, FESEM, TEM, SAED, BET surface area and TG analysis. Further, these morphologies of Mn 3 O 4 are subjected to the electrochemical characterization for evaluating the supercapacitive performance. The value of specific capacitance of MN1:1 is found to be 210 (±5) F g −1 and 155 (±5) F g −1 at 0.3 A g −1 in 1 M KCl and 1 M Na 2 SO 4 , respectively. Improved supercapacitive performance of MN1:1 in both electrolytes is attributed to the unique nanofibric morphology where small nanoparticles are interconnected with good amount of open pores and forms a porous, one dimensional and high aspect ratio nanofibers. Electrochemical impedance spectroscopy (EIS) shows very low charge transfer resistance in MN1:1 favorable for fast and facile transportation of electrolyte ions to electrode and vice versa.