Effect of reaction time on the synthesis and electrochemical properties of Mn3O4 nanoparticles by microwave assisted reflux method

► Mn3O4 nanoparticles were prepared using microwave assisted reflux synthesis method at different time periods. ► The maximum specific capacitance of 135 F g−1 at scan rate of 2 mV s−1. ► Dislocation density felicitate to the ionic conductivity. ► The enhancing capacitance due to phase or morphological changes in electrode.