study of super capacitive behavior of polyaniline/manganese oxide-carbon black nanocomposites based electrodes

the supercapacitive behavior of polyaniline/mno2-carbon black (pani/mno2-cb), mno2-cb nanocompositesand cb was studied. mno2-cb made by the in situ direct coating method to deposit mno2 onto cb; then pani coating was coated on it. morphology of the nanocomposite was studied by x-ray diffraction (xrd), fourier transform infrared (ft-ir) spectroscopy and scanning electron microscopy (sem). the electrochemical properties of electrodes were investigated by cyclic voltammetry (cv), galvanostatic charge–discharge and electrochemical impedance spectroscopy (eis) techniques in 0.5 m na2so4. the specific capacitance of 179.8 f. g-1 was obtained for pani/mno2-cb compared with 121 f. g-1 for mno2-cb and 44.87 f. g-1 for cb. the eis results also revealed improved capacitive properties of cb by the addition of mno2 and pani.