ИСТИНА

International Workshop on Electrochemistry of Electroactive Materials June 16–21, 2019, Borovets, Bulgaria WEEM-2019 Study of Polypyrrole Films Possessing an Extended Potential Range by the Method of Electrochemical Quartz Crystal Microbalance (EQCM) and the Spectroelectrochemical Method O.I. Istakova1,2, T.O. Medvedeva3, O.A. Goncharova3, D.V. Konev1,2, M.A. Vorotyntsev1,2,3,4 1Institute for Problems of Chemical Physics of the Russian Academy of Sciences, Chernogolovka, Russia 2D. I. Mendeleev University of Chemical Technology of Russia, Moscow, Russia 3M. V. Lomonosov Moscow State University, Moscow, Russia 4ICMUB - UMR 6302 CNRS - Université de Bourgogne, Dijon, France е-mail: oistakova@gmail.com Polypyrrole (pPy) is widely used in various electronic, electrochemical and membrane technologies as an electroactive polymer with high electrical conductivity and high chemical stability [1]. There are two main ways of synthesis of conducting polymers based on heterocycles. In the first method, the dissolved monomer is oxidized at the electrode surface with the formation of the polymer film. In the second method, the monomer is oxidized in a solution of a chemical agent with a deposition polymer in powder. Polypyrrole films synthesized by the electrochemical method have a relatively small window of electroactivity potentials. The authors of work [2] have revealed the possibility of obtaining polypyrrole having electroactivity in a wider range of potentials, unlike polypyrrole obtained under traditional conditions (having an electroactivity potential window of about 1 V). To achieve this effect, it is necessary to use low polypyrrole electrooxidation potentials, low monomer concentrations in the electropolymerization medium and multiscan of the obtained polypyrrole film in a monomer-free solution. The goal of this work was to study the effect of expanding the region of electroactivity potentials of polypyrrole during its multicycling using the method of electrochemical quartz crystal microbalance (EQCM) and the spectroelectrochemical method. The first method allowed to estimate the input and output of ions of the background electrolyte when cycling the polypyrrole-modified electrode. The spectroelectrochemical method made it possible to track changes in the absorption spectra of a polypyrrole film when it was multiscanned in a background electrolyte solution. 110066 International Workshop on Electrochemistry of Electroactive Materials June 16–21, 2019, Borovets, Bulgaria WEEM-2019 Acknowledgments: This work was supported by the Russian Foundation for Basic Research (project no. 19-33-01303 mol_a). [1] T.A. Skotheim, J. Reynolds, Handbook of Conducting Polymers, 2 Volume Set, CRC press, 2007, 1680. [2] M.A. Vorotyntsev, V.A. Zinovyeva, D.V. Konev, Mechanisms of electropolymerization and redox activity: fundamental aspects, S. Cosnier, A. Karyakin (ed.). Electropolymerization: concepts, materials and applications. John Wiley & Sons. 2011, 27-50. 11007