Anhydrous proton conductivity of sulfonated polysulfone/deep eutectic solvents (DESs) composite membranes: Effect of sulfonation degree and DES composition

2021 ◽  
Author(s):  
Maryam Mohammadi ◽  
Mohammad Bagher Karimi ◽  
Fereidoon Mohammadi ◽  
Shahram Mehdipour-Ataei
Keyword(s):  
Proton Conductivity ◽  
Deep Eutectic Solvents ◽  
Composite Membranes ◽  
Sulfonation Degree ◽  
Sulfonated Polysulfone

Synthesis and basic properties of sulfonated polysulfone/phosphotungstic acid (H3O40PW12) composite proton exchange membrane

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Weidong Li ◽  
Guoping Fei ◽  
Jiongxin Zhao
Keyword(s):  
Proton Conductivity ◽  
Water Uptake ◽  
Sulfonic Acid ◽  
Phosphotungstic Acid ◽  
Great Influence ◽  
Composite Membranes ◽  
Proton Exchange ◽  
Membrane Properties ◽  
Sulfonated Polysulfone ◽  
Sulfonic Acid Groups

AbstractThe sulfonated polysulfone/phosphotungstic acid (SPSU/PWA) composite membranes were investigated for proton exchange membranes. The influence of the interactions between sulfonic acid groups and phosphotungstic acid on the properties of composite membranes was studied in detail. The study showed that special interaction has great influence on the membrane properties. Fourier transform infrared (FTIR) spectroscopy of the composite membranes exhibited band shifts showing a possibility of intermolecular hydrogen bonding interaction between SPSU and PWA additives. SPSU/PWA composite membranes were evaluated for thermal stability, ion exchange capacity, water uptake and proton conductivity. Also the extraction of PWA from the composite membranes and their chemical stability were determined. Thermal analysis of the composites showed that it promotes the decomposition temperature of the sulfonic acid groups with increase in PWA weight content. Though the IEC and water uptake decreased with increase in PWA content, the proton conductivity of the composite membranes increased with increase in PWA content. The proton conductivity of the composites with 5 wt.%, 20 wt.% and 30 wt.% PWA is 2.62×10-2, 1.34×10-1 and 1.66×10-1 s·cm-1 at 80oC, respectively.

scholarly journals Sulfonated poly(arylene ether sulfone) functionalized polysilsesquioxane hybrid membranes with enhanced proton conductivity

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 430-442 ◽  
Author(s):  
Rajdeep Mukherjee ◽  
Arun Kumar Mandal ◽  
Susanta Banerjee
Keyword(s):  
Proton Conductivity ◽  
Sol Gel ◽  
Composite Membranes ◽  
Casting Technique ◽  
Force Microscopy ◽  
Arylene Ether ◽  
Transmission Electron ◽  
Uniform Dispersion ◽  
Solution Casting Technique ◽  
Sulfonated Poly

AbstractSulfopropylated polysilsesquioxane and –COOH containing fluorinated sulfonated poly(arylene ether sulfone) composite membranes (SPAES-SS-X) have been prepared via an in situ sol–gel reaction through the solution casting technique. The composite membranes showed excellent thermal and chemical stability, compared to the pristine SPAES membrane. The uniform dispersion of the sulfonated SiOPS nanoparticles on the polymer matrix was observed from the scanning electron microscope images. Atomic force microscopy and transmission electron microscopy images indicated significantly better phase-separated morphology and connectivity of the ionic domains of the composite membranes than the pristine SPAES membrane. The composite membranes showed considerable improvement in proton conductivity and oxidative stability than the pristine copolymer membrane under similar test conditions.

Electrochemical Behavior of Direct Methanol Fuel Cells Based on Acidic Silica - Sulfonated Polysulfone Composite Membranes

2019 ◽  
Vol 41 (1) ◽  
pp. 2003-2009 ◽  
Author(s):  
Vincenzo Baglio ◽  
Francesco Lufrano ◽  
Orazio Di Blasi ◽  
Pietro Staiti ◽  
Vincenzo Antonucci ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Electrochemical Behavior ◽  
Direct Methanol Fuel Cells ◽  
Composite Membranes ◽  
Sulfonated Polysulfone ◽  
Direct Methanol ◽  
Methanol Fuel Cells

Structural and Proton Conductivity Studies of Fibrous π-Ti2O(PO4)2·2H2O: Application in Chitosan-Based Composite Membranes

2021 ◽  
Author(s):  
Artem A. Babaryk ◽  
Alaa Adawy ◽  
Inés García ◽  
Camino Trobajo ◽  
Zakariae Amghouz ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Proton Conductivity ◽  
Composite Membranes ◽  
Titanium Phosphate ◽  
Polymorphic Modification ◽  
Modification Of Titanium

Although the fibrous polymorphic modification of titanium phosphate, π-Ti2O(PO4)2·2H2O (π-TiP) is known for decades, its crystal structure has remained unsolved. Herewith we report the crystal structure of π-TiP at a...

Proton Exchange Membrane Development and Processing for Fuel Cell Application

2007 ◽  
Vol 539-543 ◽  
pp. 1327-1331
Author(s):  
Philippe Bébin ◽  
Hervé Galiano
Keyword(s):  
Fuel Cell ◽  
Proton Conductivity ◽  
Proton Conduction ◽  
Proton Exchange ◽  
Membrane Properties ◽  
Organic Polymer ◽  
Polysulfone Membrane ◽  
Sulfonated Polysulfone ◽  
Membrane Processing ◽  
Conductive Fillers

The development of new proton exchange membranes for PEMFC has to be related to the membrane processing as it can change drastically the final properties of the material. Indeed, for the same material, a membrane prepared by a solvent-casting process has a lower lifetime than an extruded one. The proton conduction of the membrane can also be dependent on the membrane processing, especially when some removable plasticizers are used to perform the membrane extrusion. Some residual porosity, left in the material after removing the plasticizer, is suspected to enhance the proton conduction of the film. Fuel cell experiments have shown that extruded sulfonated polysulfone membrane can give the same performance as a Nafion® reference membrane whereas the proton conductivity of PSUs is twenty times lower than the Nafion® one. Additional improvements of the membrane properties can also be expected by adding some proton conductive fillers to the organic polymer. This approach enhances the proton conductivity of sulfonated polysulfone to values similar to Nafion®. On the other hand, when Nafion® is used as a matrix for the proton conductive fillers, a very significant improvement of fuel cell performance is obtained.

Highly selective sulfonated Poly (arylene ether nitrile) composite membranes containing copper phthalocyanine grafted graphene oxide for direct methanol fuel cell

2021 ◽  
pp. 095400832110394
Author(s):  
Yan Ma ◽  
Kaixu Ren ◽  
Ziqiu Zeng ◽  
Mengna Feng ◽  
Yumin Huang
Keyword(s):  
Graphene Oxide ◽  
Proton Conductivity ◽  
Direct Methanol Fuel Cells ◽  
Copper Phthalocyanine ◽  
Composite Membranes ◽  
Proton Exchange ◽  
Methanol Permeability ◽  
Arylene Ether ◽  
Direct Methanol ◽  
Sulfonated Poly

To improve the performances of sulfonated poly (arylene ether nitrile) (SPEN)–based proton exchange membranes (PEMs) in direct methanol fuel cells (DMFCs), the copper phthalocyanine grafted graphene oxide (CP-GO) was successfully prepared via in situ polymerization and subsequently incorporated into SPEN as filler to fabricate a series of SPEN/CP-GO-X (X represents for the mass ratio of CP-GO) composite membranes. The water absorption, swelling ratio, mechanical properties, proton conductivity, and methanol permeability of the membranes were systematically studied. CP-GO possesses good dispersion and compatibility with SPEN matrix, which is propitious to the formation of strong interfacial interactions with the SPEN, so as to provide more efficient transport channels for proton transfer in the composite membranes and significantly improve the proton conductivity of the membranes. Besides, the strong π–π conjugation interactions between CP-GO and SPEN matrix can make the composite membranes more compact, blocking the methanol transfer in the membranes, and significantly reducing the methanol permeability. Consequently, the SPEN/CP-GO-1 composite membrane displayed outstanding tensile strength (58 MPa at 100% RH and 25°C), excellent proton conductivity (0.178 S cm−1 at 60°C), and superior selectivity (5.552 × 105 S·cm−3·s). This study proposed a new method and strategy for the preparation of high performance PEMs.

scholarly journals Composite Membranes Using Hydrophilized Porous Substrates for Hydrogen Based Energy Conversion

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 6101
Author(s):  
Seohee Lim ◽  
Jin-Soo Park
Keyword(s):  
Energy Conversion ◽  
Proton Conductivity ◽  
Composite Membranes ◽  
Treatment Method ◽  
Polarization Curves ◽  
Treatment Result ◽  
Membrane Electrode ◽  
High Porosity ◽  
Hydrophilic Treatment ◽  
Porous Substrates

Poly(tetrafluoroethylene) (PTFE) porous substrate-reinforced composite membranes for energy conversion technologies are prepared and characterized. In particular, we develop a new hydrophilic treatment method by in-situ biomimetic silicification for PTFE substrates having high porosity (60–80%) since it is difficult to impregnate ionomer into strongly hydrophobic PTFE porous substrates for the preparation of composite membranes. The thinner substrate having ~5 μm treated by the gallic acid/(3-trimethoxysilylpropyl)diethylenetriamine solution with the incubation time of 30 min shows the best hydrophilic treatment result in terms of contact angle. In addition, the composite membranes using the porous substrates show the highest proton conductivity and the lowest water uptake and swelling ratio. Membrane-electrode assemblies (MEAs) using the composite membranes (thinner and lower proton conductivity) and Nafion 212 (thicker and higher proton conductivity), which have similar areal resistance, are compared in I–V polarization curves. The I–V polarization curves of two MEAs in activation and Ohmic region are very identical. However, higher mass transport limitation is observed for Nafion 212 since the composite membrane with less thickness than Nafion 212 would result in higher back diffusion of water and mitigate cathode flooding.

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