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Article: Approaches to the Modification of Perfluorosulfonic Acid Membranes.

Safronova, Ekaterina Yu / Lysova, Anna A / Voropaeva, Daria Yu / Yaroslavtsev, Andrey B

2023 Volume 13, Issue 8

Abstract: 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 ... ...

Abstract	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.
Language	English
Publishing date	2023-08-07
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	2614641-1
ISSN	2077-0375
ISSN	2077-0375
DOI	10.3390/membranes13080721
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Article ; Online: A Series of Metal-Organic Frameworks with 2,2'-Bipyridyl Derivatives: Synthesis vs. Structure Relationships, Adsorption, and Magnetic Studies.

Dubskikh, Vadim A / Kolosov, Aleksei A / Lysova, Anna A / Samsonenko, Denis G / Lavrov, Alexander N / Kovalenko, Konstantin A / Dybtsev, Danil N / Fedin, Vladimir P

Molecules (Basel, Switzerland)

2023 Volume 28, Issue 5

Abstract: Five new metal-organic frameworks based on Mn(II) and 2,2'-bithiophen-5,5'-dicarboxylate ( ... ...

Abstract	Five new metal-organic frameworks based on Mn(II) and 2,2'-bithiophen-5,5'-dicarboxylate (btdc
Language	English
Publishing date	2023-02-24
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	1413402-0
ISSN	1420-3049 ; 1431-5165 ; 1420-3049
ISSN (online)	1420-3049
ISSN	1431-5165 ; 1420-3049
DOI	10.3390/molecules28052139
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Article: Enhanced Adsorption Selectivity of Carbon Dioxide and Ethane on Porous Metal-Organic Framework Functionalized by a Sulfur-Rich Heterocycle.

Dubskikh, Vadim A / Kovalenko, Konstantin A / Nizovtsev, Anton S / Lysova, Anna A / Samsonenko, Denis G / Dybtsev, Danil N / Fedin, Vladimir P

Nanomaterials (Basel, Switzerland)

2022 Volume 12, Issue 23

Abstract: Porous metal-organic framework [ ... ...

Abstract	Porous metal-organic framework [Zn
Language	English
Publishing date	2022-12-01
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2662255-5
ISSN	2079-4991
ISSN	2079-4991
DOI	10.3390/nano12234281
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Article ; Online: On the Properties of Nafion Membranes Recast from Dispersion in

Safronova, Ekaterina Yu / Voropaeva, Daria Yu / Lysova, Anna A / Korchagin, Oleg V / Bogdanovskaya, Vera A / Yaroslavtsev, Andrey B

Polymers

2022 Volume 14, Issue 23

Abstract: Perfluorosulfonic acid Nafion membranes are widely used as an electrolyte in electrolysis processes and in fuel cells. Changing the preparation and pretreatment conditions of Nafion membranes allows for the optimization of their properties. In this work, ...

Abstract	Perfluorosulfonic acid Nafion membranes are widely used as an electrolyte in electrolysis processes and in fuel cells. Changing the preparation and pretreatment conditions of Nafion membranes allows for the optimization of their properties. In this work, a Nafion-NMP membrane with a higher conductivity than the commercial Nafion
Language	English
Publishing date	2022-12-02
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2527146-5
ISSN	2073-4360 ; 2073-4360
ISSN (online)	2073-4360
ISSN	2073-4360
DOI	10.3390/polym14235275
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Article: Cardo Polybenzimidazole (PBI-O-PhT) Based Membrane Reinforced with

Ponomarev, Igor I / Skupov, Kirill M / Modestov, Alexander D / Lysova, Anna A / Ponomarev, Ivan I / Vtyurina, Elizaveta S

Membranes

2022 Volume 12, Issue 10

Abstract: The further development of high temperature polymer electrolyte membrane (HT-PEM) fuel cells largely depends on the improvement of all components of the membrane-electrode assembly (MEA), especially membranes and electrodes. To improve the membrane ... ...

Abstract	The further development of high temperature polymer electrolyte membrane (HT-PEM) fuel cells largely depends on the improvement of all components of the membrane-electrode assembly (MEA), especially membranes and electrodes. To improve the membrane characteristics, the cardo-polybenzimidazole (PBI-O-PhT)-based polymer electrolyte complex doped with phosphoric acid is reinforced using an electrospun
Language	English
Publishing date	2022-09-29
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2614641-1
ISSN	2077-0375
ISSN	2077-0375
DOI	10.3390/membranes12100956
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Article: Self-Phosphorylated Polybenzimidazole: An Environmentally Friendly and Economical Approach for Hydrogen/Air High-Temperature Polymer-Electrolyte Membrane Fuel Cells.

Ponomarev, Igor I / Razorenov, Dmitry Y / Skupov, Kirill M / Ponomarev, Ivan I / Volkova, Yulia A / Lyssenko, Konstantin A / Lysova, Anna A / Vtyurina, Elizaveta S / Buzin, Mikhail I / Klemenkova, Zinaida S

Membranes

2023 Volume 13, Issue 6

Abstract: The development of phosphorylated polybenzimidazoles (PBI) for high-temperature polymer-electrolyte membrane (HT-PEM) fuel cells is a challenge and can lead to a significant increase in the efficiency and long-term operability of fuel cells of this type. ...

Abstract	The development of phosphorylated polybenzimidazoles (PBI) for high-temperature polymer-electrolyte membrane (HT-PEM) fuel cells is a challenge and can lead to a significant increase in the efficiency and long-term operability of fuel cells of this type. In this work, high molecular weight film-forming pre-polymers based on
Language	English
Publishing date	2023-05-25
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2614641-1
ISSN	2077-0375
ISSN	2077-0375
DOI	10.3390/membranes13060552
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Article: Effect of Organo-Silanes Structure on the Properties of Silane-Crosslinked Membranes Based on Cardo Polybenzimidazole PBI-O-PhT.

Lysova, Anna A / Ponomarev, Igor I / Skupov, Kirill M / Vtyurina, Elizaveta S / Lysov, Kirill A / Yaroslavtsev, Andrey B

Membranes

2022 Volume 12, Issue 11

Abstract: Polybenzimidazoles (PBI) doped with phosphoric acid (PA) are promising electrolytes for medium temperature fuel cells. Their significant disadvantage is a partial or complete loss of mechanical properties and an increase in hydrogen permeability at ... ...

Abstract	Polybenzimidazoles (PBI) doped with phosphoric acid (PA) are promising electrolytes for medium temperature fuel cells. Their significant disadvantage is a partial or complete loss of mechanical properties and an increase in hydrogen permeability at elevated temperatures. Covalent silanol crosslinking is one possible way to stabilize PBI membranes in the presence of PA. Three organo-substituted silanes, namely (3-Bromopropyl)trimethoxysilane (SiBr), trimethoxy [2-(7-oxabicyclo [4.1.0]hept-3-yl)ethyl]silane (Si-biC) and (3-Glycidyloxypropyl)trimethoxysilane (KH 560), were used as covalent crosslinkers of PBI-O-PhT in order to determine the effect of the silane structure and crosslinking degree on membrane properties. The crosslinking degree was 1-50%. All crosslinked membranes were characterized by impedance and IR-spectroscopy. The mechanical properties, morphology, stability and hydrogen permeability of the membranes were determined. In the case of silanes with linear substituents (SiBr, KH 560), a denser structure is formed, which is characterized by greater oxidative stability and lower hydrogen permeability in comparison to the silane with a bulk group. All the crosslinked membranes have a higher mechanical strength compared with the initial PBI-O-PhT membrane both before and after doping with PA. Despite the hardening of the polymer matrix of the membranes, their proton conductivity changes insignificantly. It was shown that cross-linked membranes can be used in fuel cells.
Language	English
Publishing date	2022-10-31
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2614641-1
ISSN	2077-0375
ISSN	2077-0375
DOI	10.3390/membranes12111078
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Article ; Online: 3D Metal-Organic Frameworks Based on Co(II) and Bithiophendicarboxylate: Synthesis, Crystal Structures, Gas Adsorption, and Magnetic Properties.

Dubskikh, Vadim A / Lysova, Anna A / Samsonenko, Denis G / Lavrov, Alexander N / Kovalenko, Konstantin A / Dybtsev, Danil N / Fedin, Vladimir P

Molecules (Basel, Switzerland)

2021 Volume 26, Issue 5

Abstract: Three new 3D metal-organic porous frameworks based on Co(II) and 2,2'-bithiophen-5,5'-dicarboxylate ( ... ...

Abstract	Three new 3D metal-organic porous frameworks based on Co(II) and 2,2'-bithiophen-5,5'-dicarboxylate (btdc
MeSH term(s)	Adsorption/drug effects ; Cobalt/chemistry ; Crystallography, X-Ray ; Ligands ; Magnetic Phenomena ; Metal-Organic Frameworks/chemistry ; Metal-Organic Frameworks/ultrastructure ; Molecular Conformation ; Organometallic Compounds/chemistry ; Porosity ; Surface Properties
Chemical Substances	Ligands ; Metal-Organic Frameworks ; Organometallic Compounds ; Cobalt (3G0H8C9362)
Language	English
Publishing date	2021-02-26
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	1413402-0
ISSN	1420-3049 ; 1431-5165 ; 1420-3049
ISSN (online)	1420-3049
ISSN	1431-5165 ; 1420-3049
DOI	10.3390/molecules26051269
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Article ; Online: On the Properties of Nafion Membranes Recast from Dispersion in N -Methyl-2-Pyrrolidone

Ekaterina Yu. Safronova / Daria Yu. Voropaeva / Anna A. Lysova / Oleg V. Korchagin / Vera A. Bogdanovskaya / Andrey B. Yaroslavtsev

Polymers, Vol 14, Iss 5275, p

2022 Volume 5275

Abstract	Perfluorosulfonic acid Nafion membranes are widely used as an electrolyte in electrolysis processes and in fuel cells. Changing the preparation and pretreatment conditions of Nafion membranes allows for the optimization of their properties. In this work, a Nafion-NMP membrane with a higher conductivity than the commercial Nafion ® 212 membrane (11.5 and 8.7 mS∙cm −1 in contact with water at t = 30 °C) and a comparable hydrogen permeability was obtained by casting from a Nafion dispersion in N -methyl-2-pyrrolidone. Since the ion-exchange capacity and the water uptake of these membranes are similar, it can be assumed that the increase in conductivity is the result of optimizing the Nafion-NMP microstructure by improving the connectivity of the pores and channels system. This leads to a 27% increase in the capacity of the membrane electrode assembly with the Nafion-NMP membrane compared to the Nafion ® 212 membrane. Thus, the method of obtaining a Nafion membrane has a great influence on its properties and performance of fuel cells based on them.
Keywords	Nafion membrane ; membrane casting ; proton conductivity ; fuel cell ; Organic chemistry ; QD241-441
Subject code	660
Language	English
Publishing date	2022-12-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A Series of Metal–Organic Frameworks with 2,2′-Bipyridyl Derivatives

Vadim A. Dubskikh / Aleksei A. Kolosov / Anna A. Lysova / Denis G. Samsonenko / Alexander N. Lavrov / Konstantin A. Kovalenko / Danil N. Dybtsev / Vladimir P. Fedin

Molecules, Vol 28, Iss 2139, p

Synthesis vs. Structure Relationships, Adsorption, and Magnetic Studies

2023 Volume 2139

Abstract: Five new metal–organic frameworks based on Mn(II) and 2,2′-bithiophen-5,5′-dicarboxylate (btdc 2– ) with various chelating N-donor ligands (2,2′-bipyridyl = bpy; 5,5′-dimethyl-2,2′-bipyridyl = 5,5′-dmbpy; 4,4′-dimethyl-2,2′-bipyridyl = 4,4′-dmbpy) [Mn 3 ( ...

Abstract	Five new metal–organic frameworks based on Mn(II) and 2,2′-bithiophen-5,5′-dicarboxylate (btdc 2– ) with various chelating N-donor ligands (2,2′-bipyridyl = bpy; 5,5′-dimethyl-2,2′-bipyridyl = 5,5′-dmbpy; 4,4′-dimethyl-2,2′-bipyridyl = 4,4′-dmbpy) [Mn 3 (btdc) 3 (bpy) 2 ]·4DMF, 1 [Mn 3 (btdc) 3 (5,5′-dmbpy) 2 ]·5DMF, 2 [Mn(btdc)(4,4;-dmbpy)], 3 [Mn 2 (btdc) 2 (bpy)(dmf)]·0.5DMF, 4 [Mn 2 (btdc) 2 (5,5′-dmbpy)(dmf)]·DMF, 5 (dmf, DMF = N,N-dimethylformamide) have been synthesized, and their crystal structure has been established using single-crystal X-ray diffraction analysis (XRD). The chemical and phase purities of Compounds 1 – 3 have been confirmed via powder X-ray diffraction, thermogravimetric, and chemical analyses as well as IR spectroscopy. The influence of the bulkiness of the chelating N-donor ligand on the dimensionality and structure of the coordination polymer has been analyzed, and the decrease in the framework dimensionality, as well as the secondary building unit’s nuclearity and connectivity, has been observed for bulkier ligands. For three-dimensional (3D) coordination polymer 1 , the textural and gas adsorption properties have been studied, revealing noticeable ideal adsorbed solution theory (IAST) CO 2 /N 2 and CO 2 /CO selectivity factors (31.0 at 273 K and 19.1 at 298 K and 25.7 at 273 K and 17.0 at 298 K, respectively, for the equimolar composition and the total pressure of 1 bar). Moreover, significant adsorption selectivity for binary C 2 –C 1 hydrocarbons mixtures (33.4 and 24.9 for C 2 H 6 /CH 4 , 24.8 and 17.7 for C 2 H 4 /CH 4 , 29.3 and 19.1 for C 2 H 2 /CH 4 at 273 K and 298 K, respectively, for the equimolar composition and the total pressure of 1 bar) has been observed, making it possible to separate on 1 natural, shale, and associated petroleum gas into valuable individual components. The ability of Compound 1 to separate benzene and cyclohexane in a vapor phase has also been analyzed based on the adsorption isotherms of individual components measured at 298 K. The ...
Keywords	manganese(II) ; metal-organic framework ; 2,2′-bithiophen-5,5′-dicarboxylic acid ; gas adsorption ; adsorption selectivity ; magnetic properties ; Organic chemistry ; QD241-441
Subject code	290
Language	English
Publishing date	2023-02-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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