Hybrid Membranes Synthesized from a Nafion Powder and Carbon Nanotubes by Hot Pressing

Прихно, И. А.; Safronova, E. Yu.; Ilyin, A. B.

doi:10.1134/s0965544117130084

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…Several research works described preparation of the PFSA hybrid membranes by other processes, in particular, the solid-phase process by hot-pressing films from a mixture of powder and dopant [ 153 , 154 ]. The following process is energy-consuming and inefficient for the production of membranes for FCs; however, it can be used to produce films of complex design and composition, in particular, gradient dopant thickness or area distribution, sandwich-type samples, films with profiled surfaces, etc.…”

Section: Hybrid Pfsa Membranesmentioning

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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Section: Hybrid Pfsa Membranesmentioning

confidence: 99%

Approaches to the Modification of Perfluorosulfonic Acid Membranes

et al. 2023

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“…Heteropoly acids, oxides, transition metal salts, carbon and graphene nanoparticles, etc. showed good results as the inorganic part of hybrid membranes [2][3][4][5][6][7][8][9][10][11]. Membranes of this kind are characterized by improved ionic conductivity, mechanical properties, pore and channel structures, and water retention capacity and by significantly enhanced selectivity of transport properties in comparison with organic polymer membranes.…”

Section: Introductionmentioning

confidence: 99%

Proton-Exchange Hybrid Membranes: A Copolymer of Ethylene Glycol Vinyl Glycidyl Ether and Vinyl Chloride/Polyorganylsilsesquioxane

Лебедева

Малахова

Raskulova

et al. 2019

Membr. Membr. Technol.

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Copolymers of ethylene glycol vinyl glycidyl ether (VGE) and vinyl chloride (VC) have been obtained via radical copolymerization of VGE with VC at 70°C in the presence of the initiator azobisisobutyronitrile. By the sol-gel synthesis involving VGE-VC copolymers and carbofunctional organosilicon precursors, such as N,N'-bis(3-triethoxysilylpropyl)thiocarbamide (BTM) and 2-([triethoxysilylpropyl]amino)pyridine (TEAP), hybrid organic-inorganic membranes possessing proton conductivity after doping with orthophosphoric acid have been fabricated. The proton conductivity of the membranes in the temperature range of 30-80°C is characterized by the values of 3.52-4.88 × 10 −3 S cm −1 for VGE-VC/ BTM/H 3 PO 4 and 1.19-2.89 × 10 −3 S cm −1 for VGE-VC/TEAP/H 3 PO 4 .

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“…Moreover, the introduction of inorganic compounds into the composites often allows the proton conductivity of the final membranes to be increased. Silicon, zirconium and cerium oxides [9][10][11], carbon materials formed as nanotubes and fullerenes [12,13], heteropolyacids, for example, phosphoric tungsten or silicon tungsten, as well as polyantimonic acids, etc. are widely used as inorganic additives [14,15].…”

Section: Introductionmentioning

confidence: 99%

Copolymers of sodium 4-styrene sulphonate and vinyl derivatives of nitrogen-containing heterocycles

Малахова¹,

Лебедева²,

Emel’yanov³

et al. 2019

PROCEEDINGS OF UNIVERSITIES APPLIED CHEMISTRY AND BIOTECHNOLOGY

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The formation of ion-exchange composite materials based on high molecular weight precursors appears to be an intensively developing area in the synthesis of proton-conducting membranes for fuel cells. In such membranes, proton transfer is often provided by functional polymers simultaneously containing sulphonic acid groups in their composition units along with fragments of vinyl derivatives of nitrogen-containing heterocyclic bases. Proton exchange activity in the latter is determined by the possibility of doping with inorganic acids. In the framework of this study, for the further formation of hybrid composite membranes under conditions of radical initiation, copolymers of sodium 4-styrene sulphonate (SSt) with 4-vinylpyridine (VP) and 1-vinylimidazole (VIM) were obtained. The monomodal nature of the turbidimetric titration curves for solutions of copolymerisation reaction products indicates the presence of true copolymers during the process of formation. The composition and structure of the copolymers were characterised using data from elemental analysis, as well as from IR and 13 C NMR spectroscopy. Constants of the relative activity for the monomers and the microstructure parameters of the polymer chains are calculated according to the non-linear leastsquares method using the MathCAD package. The calculated copolymerisation constant values indicate a greater reactivity of SSt in comparison with nitrogen-containing monomers. The lengths of the monomer unit blocks depend on the composition of the initial mixture and vary over a wide range from 1 to 18. The possibility of varying the length of the unit blocks in the composition of the copolymers will affect the ion-conducting properties of hybrid composites formed on their basis. The stability of the copolymers to thermal oxidative degradation by heating in air was studied using the differential scanning calorimetry (DSC) method. The copolymers demonstrated significant thermo-oxidative stability. Decomposition temperatures were 350 °С and 400 °С for SSt-VIM and SSt-VP copolymers, respectively.

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Hybrid Membranes Synthesized from a Nafion Powder and Carbon Nanotubes by Hot Pressing

Cited by 8 publications

References 20 publications

Approaches to the Modification of Perfluorosulfonic Acid Membranes

Approaches to the Modification of Perfluorosulfonic Acid Membranes

Proton-Exchange Hybrid Membranes: A Copolymer of Ethylene Glycol Vinyl Glycidyl Ether and Vinyl Chloride/Polyorganylsilsesquioxane

Copolymers of sodium 4-styrene sulphonate and vinyl derivatives of nitrogen-containing heterocycles

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