Enhanced electrochemical performance of manganese oxide nanocomposites for supercapacitor application

Manganese oxide (MO) has been synthesised by chemical co-precipitation method and it was characterised for its functional group, phase structure, particle size and morphology by using FTIR, XRD, SEM and TEM. Additionally, its electrochemical properties like cyclic voltammetry (CV), galvanostatic charge/ discharge and electrochemical impedance spectroscopy (EIS) are recorded. The specific capacitance of the prepared manganese oxide is found to be 116 F/g at current density of 1 A/g. To augment its capacitance value, it was doped with multi-walled carbon nanotube (MWCNT) and poly(3,4 ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and their electrochemical performance are recorded. By doping MWCNT and PEDOT:PSS over MO, a high specific capacitance of 537 F/g at a current density of 1 A/g with 97% capacitance retention and coulombic efficiency of 98% over 10,000 cycles at a current density of 5 A/g is obtained. All these results demonstrates that MO/MWCNT/PEDOT:PSS is a promising electrode material for supercapacitor application.