Abstract
The present investigation describes the addition of iron (Fe) in order to improve the supercapacitive properties of MnO 2 electrodes using galvanostatic mode. These amorphous worm like Fe: MnO 2 electrodes are characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDAX), Fourier transform infrared spectroscopy (FTIR) and wettability test. The supercapacitive properties of MnO 2 and Fe: MnO 2 electrodes are investigated using cyclic voltammetry, chronopotentiometry and impedance techniques. It is seen that the supercapacitance increases with increase in Fe doping concentration and achieved a maximum of 173 F g −1 at 2 at% Fe doping. The maximum supercapacitance obtained is 218 F g −1 for 2 at% Fe: MnO 2 electrode. This hydrous binary oxide exhibited ideal capacitive behavior with high reversibility and high pulse charge–discharge property between −0.1 and +0.9 V/SCE in 1 M Na 2SO 4 electrolyte indicating a promising electrode material for electrochemical supercapacitors.
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