Asymmetry of voltammetric characteristics of perfluorinated MF-4SK membranes with polyaniline-modified surface

Kononenko, N. A.; Dolgopolov, S. V.; Березина, Н. П.; Loza, N. V.; Лакеев, С. Г.

doi:10.1134/s1023193512080095

Cited by 5 publications

(3 citation statements)

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“…The i 1 value can be con ventionally called the "quasilimiting" current. The i 2 value is comparable to the limiting current density for the initial MF 4SK membrane in this solution [1]. As shown earlier, the potential difference of the appearance of the limiting state on the initial membrane is ~0.060 V, which approximates the potential difference of the appearance of the first maximum for the composite.…”

Section: Resultsmentioning

confidence: 89%

“…A study of the current voltage curves (CVCs) of MF 4SK membranes surface modified with polyaniline (PAni) in solutions of sodium chloride and hydroxide and hydrochloric acid was reported in [1]. It revealed the asymmetry of CVCs in the hydrochloric acid solution with a protonated polyaniline layer: the ohmic seg ment of the current voltage curve differed tenfold at different membrane orientations relative to the flow of counterions.…”

Section: Introductionmentioning

confidence: 98%

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Effects of ph variation in solutions under the polarization conditions of the MF-4SK membrane with surface modified by polyaniline

et al. 2015

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The effects of variation of pH of NaCl solutions under the conditions of polarization of the MF 4SK membrane surface modified with polyaniline were studied. Experimental evidence was obtained for the effect of bipolar contacts between the sulfo groups of the membrane and the positively charged nitro gen atoms of polyaniline on water splitting under the polarization conditions. The electrochemical behavior of the composite with its modified layer orientated toward the flow of counterions was found to be similar to that of the MB 3 bipolar membrane, which shows itself as acidification of the solution in the concentration chamber (alkalization of the electrolyte in the desalination chamber was absent). After the reverse orienta tion, the behavior of the composite was the same as that of the initial MF 4SK membrane.

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Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 98%

Effects of ph variation in solutions under the polarization conditions of the MF-4SK membrane with surface modified by polyaniline

et al. 2015

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“…The maximum value of the diffusion asymmetry reached 79% for dilute HCl solutions. The effect of the asymmetry of the voltametric characteristics depending on the orientation of the membranes to the ion flux was recently investigated [ 202 ]. A study of the voltametric curves in a series of isomolar HCl-NaCl solutions revealed that the PANI layer changes the mechanism of proton transfer when the modified side is oriented toward the counterion flux.…”

Section: Hybrid Pfsa Membranes With Nonuniform Dopant Thickness Distr...mentioning

confidence: 99%

Approaches to the Modification of Perfluorosulfonic Acid Membranes

et al. 2023

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Polymer ion-exchange membranes are featured in a variety of modern technologies including separation, concentration and purification of gases and liquids, chemical and electrochemical synthesis, and hydrogen power generation. In addition to transport properties, the strength, elasticity, and chemical stability of such materials are important characteristics for practical applications. Perfluorosulfonic acid (PFSA) membranes are characterized by an optimal combination of these properties. Today, one of the most well-known practical applications of PFSA membranes is the development of fuel cells. Some disadvantages of PFSA membranes, such as low conductivity at low humidity and high temperature limit their application. The approaches to optimization of properties are modification of commercial PFSA membranes and polymers by incorporation of different additive or pretreatment. This review summarizes the approaches to their modification, which will allow the creation of materials with a different set of functional properties, differing in ion transport (first of all proton conductivity) and selectivity, based on commercially available samples. These approaches include the use of different treatment techniques as well as the creation of hybrid materials containing dopant nanoparticles. Modification of the intrapore space of the membrane was shown to be a way of targeting the key functional properties of the membranes.

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Polymerization of aniline in perfluorinated membranes under conditions of electrodiffusion of monomer and oxidizer

Andreeva

Loza

Kutenko

et al. 2019

J Solid State Electrochem

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Asymmetry of voltammetric characteristics of perfluorinated MF-4SK membranes with polyaniline-modified surface

Cited by 5 publications

References 10 publications

Effects of ph variation in solutions under the polarization conditions of the MF-4SK membrane with surface modified by polyaniline

Effects of ph variation in solutions under the polarization conditions of the MF-4SK membrane with surface modified by polyaniline

Approaches to the Modification of Perfluorosulfonic Acid Membranes

Polymerization of aniline in perfluorinated membranes under conditions of electrodiffusion of monomer and oxidizer

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