Enhancement in electrochemical behavior of cobalt doped α-MnO2 nanoparticles

In this experiment, the special prominence is given to the influence of Cobalt (Co) doped alpha-MnO2 NPs synthesized via co-precipitation technique. X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR) and Scanning Electron Microscope (SEM) with Energy Dispersive X-ray (EDX) analysis are used to examine the Co doped alpha-MnO2 nanoparticles. Further, the capacitance natures of the electrodes were determined from cyclic voltammetry, galvanostatic charge-discharge measurement and electrochemical impendence spectroscopy. As from the electrochemical analysis, the prepared electrode was showing the pseudo capacitance nature. Also, the prepared Co doped alpha-MnO2 electrode was showing the higher capacitance values of 1015 F/g at 10 mV/s which is more than the pure alpha-MnO2 (901 F/g at 10 mV/s). In addition, the study of charge-discharge curve shows that the capacitance values of the Co doped alpha-MnO2 (996 F/g at 1 A/g) electrode is more than the pure alpha-MnO2 (876 F/g at 1 A/g) electrode. Moreover, Co doped alpha-MnO2 electrode shows the much lower Rct (charge transfer) value which indicates the better SC performance of the prepared electrode material.