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- W2023134772 abstract "Permeation of electroactive species, namely hydroquinone (H2Q), potassium ferrocyanide (K4Fe(CN)6) and ferros sulfate (FeSO4) dissolved in solution, through poly(m-aminophenol) coated on Pt electrode and the effect of the polymer layer on the rate of oxidation of these species have been investigated. The film-modified electrode is found to electrocatalyse the oxidation of H2Q while it retards the oxidation of FeSO4 and K4Fe(CN)6. Furthermore, the retardation effect is more pronounced for FeSO4 oxidation than K4Fe(CN)6. Experimental results rule out the possibility of electronic conduction of the film leading to electrolysis at the film/solution interphase; mediation of the redox sites of the polymer and the membrane diffusion through the viscous polymer layer are identified. Chronoamperometric measurements coupled with hydrogen adsorption studies on Pt reveal that the polymer covers only 58% of the electrode surface and contains pinholes of 0.3888 μm radius and also that the transport of the electroactive species takes place through these pinholes. Theoretical studies based on X-ray and IR analyses reveal that pinholes of various size and shape are possible, which explains the discrepany in electrocatalysis towards various species. The results show that high current density prevails on modified electrodes which consequently increases the catalytic rate. However, this advantage is subjected to the transport of species through the polymer coating. The latterphenomenon governs whether the film enhances or decreases the rate of electrochemical reaction. Conclusions drawn from this study indicate that poly(m-aminophenol) may not be a good corrosion protector for long-term applications." @default.
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- W2023134772 date "1993-05-01" @default.
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- W2023134772 title "Permeability and electrocatalytic properties of film prepared by electropolymerization of m-aminophenol" @default.
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- W2023134772 doi "https://doi.org/10.1016/0379-6779(93)91129-p" @default.
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