Performance of polyaniline/manganese oxide-MWCNT Nanocomposites as Supercapacitors

Composite electrodes of polyaniline/MnO2-Multi walled carbon nanotube (PANI/MnO2-MWCNT), MnO2-MWCNT nanocomposites and MWCNT were produced by the in situ direct coating approach. The structure and morphology of the nanocomposites were studied by Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM). The electrochemical properties of electrodes were also investigated by cyclic voltammetry (CV), galvanostatic charge–discharge and electrochemical impedance spectroscopy (EIS) techniques in 0.5 M Na2SO4. The specific capacitance of 321.47 F. g-1, 277.77 F. g-1, and 80 F. g-1 were obtained for PANI/MnO2-MWCNT, MnO2-MWCNT, and MWCNT, respectively. The EIS results also showed that the capacitive behavior of MWCNT was improved by the addition of MnO2 and PANI.