Room temperature synthesis of freestanding 2D Mn3O4 nanostructures with enriched electrochemical properties for supercapacitor application

Here we report low temperature growth of two dimensional freestanding nanoplatelets of manganese oxide (Mn3O4) through a simple and cost-effective wet chemical route without the utilization of capping agents. The pristine 2D Mn3O4 nanoplatelets have size and thickness between 100 and 200 nm and 3.5-5.1 nm respectively as corroborated by FESEM, TEM and AFM analysis. The electrochemical performance of the 2D Mn3O4 based electrode is studied using three electrode configuration and 1 M KOH as electrolyte where the remarkably high specific capacitance of 537 F/g (at 2 A g(-1)) is observed. Moreover, the 2D Mn3O4 based electrode is also found to exhibit an excellent retention of specific capacitance (similar to 93%) up to 5000 cycles. Thus enriched electrochemical performance of 2D Mn3O4 nanoplatelets reveals its potential as electrode material in supercapacitor device applications.