Spinel type manganese oxide (Mn 3 O 4) nanoparticles were synthesized by ultrasonic irradiation assisted co-precipitation method using PEG and NaOH. The formation of tetragonal hausmannite phase (Mn 3 O 4) with spinel structure was confirmed from XRD and FTIR studies. The average crystallite size was determined from Scherrer formula (39.9 nm) and Williamson-Hall relation (36.5 nm). The presence of elements, the overall oxidation state of manganese (Mn 2+ , Mn 3+ and Mn 4+) and chemical composition of these nanoparticles were determined using XPS. The morphology, chemical composition and electrochemical performance of Mn 3 O 4 nanoparticles were analysed and studied by SEM, EDS, CV, CP and AC impedance analysis. The maximum specific capacitance of Mn 3 O 4 nanoparticles was found to be 296 F/g at a current density of 1 A/g 2. Hence, the use of surfactant and the presence of ultrasonic irradiation in the synthesis process plays a dominant role in the electrochemical performance of Mn 3 O 4 supercapacitors.
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