Electrochemical properties of MWCNTs-polypyrrole nanocomposite films prepared by AC-EPD technique / Siti Norazlin Nordin

The deposition of MWCNTs-PPy film on nickel foil was carried out using AC-EPD technique. The film deposition without formation of bubbles and less microcracking were successfully prepared by optimizing parameter such as frequency, waveforms, deposition times, peak to peak voltages and duty cycles. The MWCNTs-PPy nanocomposite film was characterized via Field Emission Scanning Electron Microscope (FESEM), Fourier Transform Infrared Spectroscopy (FTIR) and cyclic voltammetric and galvanometric charge-discharge (CV-CD). The FESEM images shows nanotubes enwrapped uniformly with PPy. FTIR spectra were study the functional group of deposited film . The N-H stretching vibration at 3522 cm'1 prove the presence of PPy in MWCNTs films. CV-CD analysis showed highest redox peaks is belonging to the MWCNTs-PPy electrodes. The value of specific capacitance for MWCNTs-PPy, MWCNTs and PPy films which are 64.92 Fg'1, 7.04 Fg'1 and 31.16 Fg'1 , respectively.The MWCNTs-PPy has highest energy density compare to MWCNTs and PPy which are 6.57 Wh kg'1, 0.71 Wh kg'1 and 3.15 Wh kg'1 respectively. The power density for MWCNTs-PPy, MWCNTs and PPy films are 472.66 Wkg'1, 195.05 Wkg'1 and 111.31 Wkg'1, respectively. MWCNTs-PPy gives highest energy efficiency which is 91.7 %. It has demonstrated that, AC-EPD allows the electrophoretic deposition in aqueous suspension without structural damage.