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Subject: Chemistry × Author: Bisht, Anjali × Type: Thesis × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Carbide modification of polypyrrole for electrochemical energy storage
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2018-08) Bisht, Anjali; Zaidi, M.G.H.
    A series of carbide/conducting polymer based electrode materials (EMs) were synthesized through surfactant assisted dilute solution polymerization in presence of ferric chloride oxidant. For this study,pyrrole was selected as monomer whereas silicon carbide (SiC) and tungsten carbide (WC) were selected as fillers. The formation of polypyrrole (PPY) and respective EMs comprising SiC and WC (21 %,w/w) was ascertained through Fourier transformed infra-red (FTIR), X-ray diffraction spectra (XRD), Simultaneous thermogravimetric-differential thermal analysis–differential thermogravimetry (TGA-DTG-DTA) and scanning electron microscopy-energy dispersive X-ray (SEM-EDX).Working electrodes (WEs) were fabricated to investigate the utility of EMs towards electrochemical energy storage. In general, PPY and respective EMs have shown the charging and discharging close to a rectangular shape and there is no current peak caused by a redox reaction, indicating a typical supercapacitivebehaviour with good charge propagation till 100 cycles. With scan rate, the ranges for Cs (F/g) of WE derived from SiC, WC and PPY were observed as 11.00 to 334.20, 13.20 to 435.20 and 10.80 to 323.20 respectively in the potential range of -0.7 to -0.2 V. With concentration of SiC, the respective EMs have shown CS ranging 368.00 to 620.80 F/g at 0.001 V/s. Under identical conditions, the Cs of EMs derived from WC was in the range of 563.20 to 716.80 F/g. The stability of WEs derived from PPY and respective EMswere investigated under electrochemical impedance spectroscopy and potentiodynamic polarization. The polarization data monitored through SEM-EDX reveals change in the morphology of PPY and respectiveEMs. The present study provides a pioneer attempt towards development and characterization of carbide modified conducting polymer for electrochemical energy storage.