Development Of Nanocomposites Based On Polypyrrole And Carbon Nanotubes For Supercapacitors

Abstract

Supercapacitors are recognized as one of the most promising energy storage devices for a wide range of civilian and military applications in electric vehicles, uninterruptible power supplies. Conducting polymer nanocomposites are new functional materials suitable for supercapacitors due to synergistic effect of individual components. In present work, polypyrrole/CNT nanocomposites have been prepared by an in-situ chemical polymerization method and studied for supercapacitor. CNTs were well functionalized using 3:1 ratio of H 2 SO 4 and HNO 3 before polymerizing the pyrrole. Analytical techniques such as SEM, UV-VIS and FTIR were used to characterize the synthesized materials. The SEM images reveal that the materials have rough and granular morphology. The composites showed good interaction based on the shift to longer wavelengths in the electronic transition, indicating the interaction between PPy and functionalized CNTs as observed in their UV-VIS and FTIR spectra. The electrochemical performance was evaluated by using cyclic voltammetry (CV) in 1M Na 2 SO 4 electrolyte and specific capacitance was obtained at 0.5 V/s for pure polypyrrole and PPy/CNT nanocomposites. Nanocomposite showed the enhanced electrochemical performance as compared to that of pure polypyrrole. The specific capacitance obtained at the scan rate 0.5V/s was found to be 0.825 F/cm -2 for pure polypyrrole and 1.0619 F/cm -2 for PPy/CNT nanocomposite material respectively, indicates that PPy/CNT nanocomposite is suitable material as electrode for supercapacitor as compoared to pure polypyrrole.

Study of Ethanol Vapour Sensing Behaviour by Polypyrrole-multiwall Carbon Nanotubes Nanocomposites

“…24 The peak appearing at 680 cm −1 corresponds to ring deformation. 26 It is observed that all the peaks appearing in the fingerprint region of PPy are also observed in the FTIR spectra of PPy/MWCNT nanocomposites. This indicates that the main constituents of PPy and its nanocomposite with MWCNTs have the same chemical structure.…”

Study of Polypyrrole-Coated MWCNT Nanocomposites for Ammonia Sensing at Room Temperature

“…The band at 1291 cm −1 is related to the C-N in-plane, and the bands at 1175 and 1042 cm −1 are associated to the C-H bending modes while the band for C-H out-of-plane deformation vibration was observed at 898 cm −1 [29]. The peaks at 672 cm −1 corresponding to ring deformation, 948 cm −1 corresponding to C-H deformation [33]. It was observed that all the spectra contain a very weak but broad adsorption band in the region between 2500 cm −1 to 3500 cm −1 , which is commonly assigned for the adsorption band of O-H, C-H, N-H groups [20].…”

Polypyrrole/MnO2 nanocomposites as potential electrodes for supercapacitor

“…500µL pyrrole was slowly added drop wise and the polymerization was allowed to continue for 4 h with constant stirring. The precipitated composite was filtered, washed thoroughly with de-ionized water and then dried to get PPy/MnO2 nanocomposite [17]. The similar procedure was carried out for 10% and 15% MnO2.…”