ИСТИНА

Poly(3,4-ethylenedioxithiophene) (PEDOT) attracts significant attention due to its excellent electronic, electrochemical and optical properties. In this work the matrix-assisted oxidative polymerization of monomer 3,4-ethylenedioxithiophene (EDOT) on multiwalled carbon nanotubes (MWCNT) catalyzed by high redox potential laccase Trametes hirsuta was investigated. Air oxygen served as a mild oxidant in the enzymatic reaction. The ‘hard’ matrix MWCNT was used to receive nanocomposite PEDOT/MWCNT. It was shown that enzymatic EDOT polymerization did not take place without MWCNT. The obtained composite PEDOT/MWCNT was characterized by various physicochemical methods (FTIR spectroscopy, transmission electron microscopy and cycling voltammetry). The FTIR spectrum of the composite had shown vibration peaks at 1510 and 1385-1398 cm-1 which attributed to C=C and C-C stretching from the thiophene ring of PEDOT. The C-S stretching vibration can be observed at 975, 830 and 670-680 cm-1. The bands at 1125-1137 and 1045-1055 cm-1 are assigned to the stretching modes of the ethylenedioxy groups of EDOT monomer. TEM image of PEDOT/MWCNT showed that laccase-catalyzed EDOT polymerization on the MWCNTs resulted in core-shell structure composite. The enzymatically obtained PEDOT/MWCNT composite had high specific capacitance cycling stability during doping/dedoping process. The specific capacitance of the composite measured by cycling voltammetry technique with a potential scan rate of 5 mV/s was ca. 318 F/g. After 3 000 cycles of the potential scanning, the specific capacitance of the composite decreased by less than 5%. The enzymatically synthesized PEDOT/MWCNT composite is a promising electroactive material for high performance supercapacitor device application.