Stability of Prussian Blue–polypyrrole (PB/PPy) composite films synthesized via one-step redox-reaction procedure

Abstract

Composite materials of Prussian Blue-polypyrrole (PB/PPy) were obtained via chemical redox process in mixed solution of iron (III), hexacyanoferrate (III), and pyrrole with chloride or nitrate supporting electrolyte. Synthesized composites in the form of a sedimented powder, or a film on the surface of Pt and ITO-coated glass, were characterized by various physical and electrochemical methods. Stability of PB/PPy films on Pt substrate was tested in electrocatalytic reaction of hydrogen peroxide reduction in weakly acidic medium (pH 6) as well as on ITO-coated glass substrate via electrochromic (spectroelectrochemical) measurements. Stability period of the amperometric response in 1 mM H 2 O 2 solution for films on Pt substrate synthesized in chloride media is 20 times longer than that of pure PB films obtained electrochemically in potentiostatic mode. Morphology of PB/PPy films has been found to depend on the composition of supporting electrolyte. Synthesis of PB/PPy composites in nitrate electrolyte leads to formation of a high-quality morphology, whereas PB/PPy films obtained in chloride solutions are cracked. In conformity with this observation, the stability period of the H 2 O 2 electroreduction for nitrate-synthesized films on Pt substrate was about 150 min, i.e., 80 times longer than that of pure Prussian Blue films without polymeric support and four times longer than that of chloride-synthesized films. Stability of the electrochromic response of PB/PPy films formed in nitrate media is 10 times higher than pure PB film.

Prussian Blue Modified Submicron Structured Gold Electrodes for Amperometric Hydrogen Peroxide Sensing

“…It is well known that the thermodynamic instability of Prussian white and the ability of hydroxyl ions to solubilize the inorganic polycrystal has resulted in the deterioration of the PB modified hydrogen peroxide sensors . In our work here, the stability of the experimental sensors is tested by means of the hydrogen peroxide reduction , which was performed by putting the PB modified electrode into the stirred batch reaction vessel with phosphate buffer solution of 1 mM H 2 O 2 concentration, applying −100 mV potential on the WE. The test would be terminated when the responding current density decreased −100 μA cm −2 than the responding current of the injecting point.…”

“…In addition, CVs with a scanning rate of 50 mV/s for 1000 cycles is also conducted to evaluate the stability of the experimental sensors. The area ratio of CV plot after per 100 cycle to the area of initial CV plot is used as the stability degree of PB modified electrodes . The results from CVs tests demonstrate that after 1000 cycles, the stability degree of SM−Au/PB electrode only dropped by 10 % (Figure (a) and (c)), whereas the stability degree of flat Au/PB electrode decreased rapidly by 25 % (Figure (b) and (c)) after 1000 cycles of CV measurements.…”

Electroactive ion exchange materials: current status in synthesis, applications and future prospects

“…127 However, the powdertype CPs-MHCFs hybrids prepared by chemical method are generally hard to be fabricated as hybrid electrode because of the poor adhesion between the hybrid and electrode. Talagaeva et al presented a one-step chemical redox reaction procedure for the preparation of PB/PPy composite, which was generated via one-pot redox reaction between the oxidizer (equimolar mixture of Fe 3+ and [Fe(CN) 6 ] 3− salts) and the reducing agent (pyrrole monomers).…”

Electrochemical and electrocatalytic stability of Prussian blue/Berlin green redox transformation in Prussian blue-polypyrrole composite films

“…In our previous works, we discussed some ways to solve the problem of low stability of PB properties especially by creating composite materials consist of PB nanoparticles and stabilizing matrix of conductive polymer polypyrrole (PPy) [12][13][14][15]. Optimal parameters of synthetic procedure [13] and reaction mixtures [12,13,15] to obtain the composite films Prussian blue-polypyrrole (PB-PPy) on the surface of optical transparent inert electrodes with the highest value of colour contrast coefficient and the lowest degradation degree were discussed.…”