Enzymatic synthesis and electrochemical characterization of sodium 1,2-naphthoquinone-4-sulfonate-doped PEDOT/MWCNT composite

Irina S Vasil'eva; Galina P Shumakovich; Maria E Khlupova; Roman B Vasiliev; Viktor V Emets; Vera A Bogdanovskaya; Olga V Morozova; Alexander I Yaropolov

doi:10.1039/d0ra05589a

Enzymatic synthesis and electrochemical characterization of sodium 1,2-naphthoquinone-4-sulfonate-doped PEDOT/MWCNT composite

RSC Adv. 2020 Sep 7;10(55):33010-33017. doi: 10.1039/d0ra05589a.

Authors

Irina S Vasil'eva¹, Galina P Shumakovich¹, Maria E Khlupova¹, Roman B Vasiliev², Viktor V Emets³, Vera A Bogdanovskaya³, Olga V Morozova¹, Alexander I Yaropolov¹

Affiliations

¹ Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences Leninsky Ave. 33, Bld. 2 119071 Moscow Russia yaropolov@inbi.ras.ru alexander-yaropolov52@yandex.ru +7 495 954 2732 +7 495 954 4477.
² Department of Materials Science, Lomonosov Moscow State University Leninskie Gory 1/3 119991 Moscow Russia.
³ Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences Leninsky Ave. 31 119071 Moscow Russia.

Abstract

The development of novel materials with improved functional characteristics for supercapacitor electrodes is of current concern and calls for elaboration of innovative approaches. We report on an eco-friendly enzymatic synthesis of a composite based on poly(3,4-ethylenedioxythiophene) (PEDOT) and multi-walled carbon nanotubes (MWCNTs). The redox active compound, sodium 1,2-naphthoquinone-4-sulfonate (NQS), was used as a dopant for the backbone of the polymer. Oxidative polymerization of 3,4-ethylenedioxythiophene (EDOT) was catalyzed by a high redox potential laccase from the fungus Trametes hirsuta. Atmospheric oxygen served as an oxidant. A uniform thin layer of NQS-doped PEDOT formed on the surface of MWCNTs as a result of the enzymatic polymerization. The PEDOT-NQS/MWCNT composite showed a high specific capacitance of ca. 575 F g^-1 at a potential scan rate of 5 mV s^-1 and an excellent cycling stability within a potential window between -0.5 and 1.0 V, which makes it a promising electrode material for high-performance supercapacitors.