Synthesis of 9H-carbazole-9-carbothioic methacrylic thioanhydride, electropolymerization, characterization and supercapacitor applications

A novel organic molecule of 9 H -carbazole-9-carbothioic methacrylic thioanhydride (CzCS 2 metac) was synthesized by incorporating CS 2 and methacrylate groups into the carbazole monomer structure. CzCS 2 metac was characterized by FTIR, 1 H-NMR and 13 C-NMR spectroscopy. CzCS 2 metac was electropolymerized in 0.1 M tetraethylammonium tetrafluoroborate (TEABF 4 )/acetonitrile (CH 3 CN) on glassy carbon electrode (GCE). The characterization of the electrocoated P(CzCS 2 metac)/CFME thin film was studied by various techniques, such as cyclic voltammetry, scanning electron microscopy–energy-dispersive X-ray analysis and electrochemical impedance spectroscopy. The specific capacitance ( C sp ) of P(CzCS 2 metac)/MWCNT/GCE in the scan rate of 20 mV s −1 ( C sp = 38.48 F g −1 from area formula, C sp = 38.52 F g −1 from charge formula) was increased ~15.66 and ~15.64 times in area and charge formulas compared to P(CzCS 2 metac)/GCE ( C sp = 2.46 F g −1 from area and charge formulas). The same results were also obtained from Nyquist graphs. The specific capacitance value of composite film ( C sp = 1.09 × 10 −3 F) is ~15.66 times higher than the polymer film ( C sp = 6.92 × 10 −5 F). The composite film may be used as supercapacitor electrode material in energy storage devices.