In this study, iron addition was attempted to improve the pseudo-capacitive property of manganese oxide. Amorphous Fe: MnO2 electrodes have been successfully synthesized potentiodynamically and are characterized using X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Energy dispersive X-ray analysis (EDAX), Fourier transform infrared spectroscopy (FTIR) and wettability test. The supercapacitive performance of MnO2 and Fe: MnO2 is tested using cyclic voltammetry (CV) technique in Na2SO4 electrolyte within potential window of -0.1 to + 0.9 V. The effect of Fe doping on structural, morphological and supercapacitive properties of MnO2 thin films has been investigated. Further the effect of scan rate on the supercapacitance of Fe: MnO2 electrodes have been studied. The results show that as Fe doping increases up to 2 at % the supercapacitance increases from 210 to 276 F.g−1. The maximum specific capacitance of 313 F.g−1 was achieved for 2 at % Fe: MnO2 at 5 mV.s−1 scan rate. Additionally, stability and charging-discharging characteristics of MnO2 and Fe: MnO2 electrodes are studied.
Amorphous materials, thin film, chemical synthesis, supercapacitor, impedance spectroscopy
