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Evaluation of the Electrochromic Response of Polypyrrole in the Presence of CO2 in the Solution
* 1, 2 , 3 , 1, 2, 3
1  Department of Functional Materials and Electronics, State Research Institute Centre for Physical Sciences and Technology, Sauletekio Ave. 3, LT-10257 Vilnius, Lithuania
2  Department of Physical Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko Str. 24, LT-03225 Vilnius, Lithuania
3  NanoTechnas—Nanotechnology and Materials Science Center, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko Str. 24, LT-03225 Vilnius, Lithuania

https://doi.org/10.3390/I3S2021Dresden-10128 (registering DOI)
Abstract:

The indium tin oxide (ITO) coated glass was used as a working electrode for electrochemical deposition of conducting polymer polypyrrole (Ppy). Before polymerization, the electrode surface was additionally modified with triethoxymethylsilane (TEMS) to provide better adhesion of polypyrrole to the surface of ITO. Polymerization of Ppy was performed electrochemically as it was described in a previous study. The ionic strength of the solution was supported by LiClO4. Since the dissolved CO2 in the solution forms the weak acid and thus the pH of a solution can be slightly changed the electrochromic response to the pH changes was evaluated. Britton – Robinson buffer (BRB) was used as the model system for evaluation of the electrochromic response of polypyrrole at different pH values and concentrations of NaHCO3, which was a source of CO2 in the solution. For the evaluation of electrochromic response in the presence of CO2 the double potential step chronoamperometry method was applied and UV-Vis absorption spectra were registered. To gain insight into the charge transfer phenomenon in more detail, the cyclic voltammetry experiments at different glass/ITO(TEMS)/Ppy electrode potential sweep rates were performed.

Keywords: conductive polymer; polypyrrole (Ppy); electrochemical polymerization; electrochromic properties.
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