Electrochemical and electrocatalytic stability of Prussian blue/Berlin green redox transformation in Prussian blue-polyp
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ORIGINAL PAPER
Electrochemical and electrocatalytic stability of Prussian blue/Berlin green redox transformation in Prussian blue-polypyrrole composite films Nataliia V. Talagaeva 1 & Sofia A. Kleinikova 1,2 & Konstantin V. Gor’kov 1 & Ekaterina V. Zolotukhina 1,3 Received: 28 April 2020 / Revised: 29 May 2020 / Accepted: 29 May 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Redox transformation of Prussian blue to Berlin green (PB/BG) in Prussian blue-polypyrrole (PB-PPy) composites synthesized via original one-step method has been studied. It was shown that the nature of anion and composition of background electrolyte play an important role for both the stability and the shape of electrochemical response of composite film during redox transfer of Prussian blue to Berlin green. Nitric acid, phosphoric acid, malic acid and citric acid 0.05 N (eq/L) solutions and the same acids partially neutralized with 0.01 N KOH were used as electrolyte to study the role of potassium ions presence in solution. The most stable electrochemical response of PB/BG redox transfer was obtained for the nitrate anions containing solutions in the presence of potassium ions. Nevertheless, the stability of the electrochemical transformation PB/BG in composite films in other media is enough to detect the sulphite ions content in wine samples via electrocatalytic reaction at the potentials of PB/BG redox transformation. Keywords Prussian blue . Polypyrrole . Composites . Sulphite . Electrooxidation . Sensor
Introduction Prussian blue (PB), Fe4[Fe(CN)6]3, deposited in the form of a thin film on the surface of the inert electrode is known due to its redox transformations to both partially (Prussian green or Berlin green, BG) or fully oxidized (Prussian yellow) and reduced (Prussian white, PW) forms in dependence on the electrode potential [1, 2]. Redox transformations in this electroactive material Dedicated to Professor Fritz Scholz anniversary - the great person in electrochemistry, in particular, in the area of conductive polymers and Prussian blue Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10008-020-04687-y) contains supplementary material, which is available to authorized users. * Ekaterina V. Zolotukhina [email protected] 1
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Russia
2
Lomonosov Moscow State University, Moscow, Russia
3
Moscow Institute of Physics and Technology, Dolgoprudny, Russia
are accompanied with its colour changes (by reduction to PW, the blue film of PB becomes colourless; by oxidation to BG, its colour changes to green [3]) that make PB interesting for design of electrochromic devices [4–6]. PW and BG are also known for their electrocatalytic activity toward hydrogen peroxide [5, 7] and sulphite anions [8, 9]. The dependence of the redox response shape of PB film upon the PB-PW redox transformations on the concentration of potassium ions in the electrolyte leads to developing a method for detect
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