Blend membranes of sulfonated poly (ether ether ketone) and thermoplastic poly (urethane) for fuel cells

Dönmez, Göknur; Okutan, Merve; Deligöz, Hüseyin

doi:10.1007/s10965-019-1792-7

Cited by 12 publications

(11 citation statements)

References 31 publications

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“…PEEK sulfonation was carried out in a similar way reported previously. 11,12 At first, 5 g of PEEK was dried at 100 C for 24 h in a vacuum oven. The obtained dry PEEK was completely dissolved in 250 mL H 2 SO 4 for 48 h. Then, the solution was dropped into an ice-water mixture very slowly.…”

Section: Sulfonation Of Peekmentioning

confidence: 99%

“…The methanol permeabilities (P M ) of the membranes were examined using the same experimental procedure reported in our earlier studies. 11,12 Surface images of the prepared composite membranes were taken using the FEI Quanta FEG 450 scanning electron microscope after sputtering the samples with gold. The surface hydrophilicity of the composite membranes was investigated using KSV Attension Tensiometer.…”

Section: Characterization Of the Composite Membranesmentioning

confidence: 99%

“…The sulfonation degrees of the membranes were calculated using the equation DS = [288*IEC/ (1000 À 102*IEC)]. 11,28,29 Based on this, the pure sPEEK membrane was found to have a sulfonation degree of 25.4%. On the other hand, it was seen that the sulfonation degrees varied depending on the filler type and amount for filler-containing sPEEK composite membranes.…”

Section: Ion Exchange Capacity and Sulfonation Degreementioning

confidence: 99%

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A comparative study on sPEEK‐based composite membranes with various inorganic fillers using different preparation routes for DMFCs

Dönmez

Gülcan

Deligöz

2023

Polymer Engineering & Sci

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In this study, proton‐conducting sulfonated polyether ether ketone (sPEEK) membranes including tungstic acid, organically modified montmorillonite, and silicon dioxide were prepared using solution casting method for direct methanol fuel cells. All obtained composite membranes had adequate thermal stability for fuel cells, and their surfaces became more hydrophilic due to the incorporation of additives. The ion exchange capacities of the composite membranes were found to be very close to the sPEEK membrane. While the proton conductivity of the sPEEK membrane was 8.6 mS cm−1, the addition of additives led to an enhancement in the proton conductivity values. Among the prepared composite membranes, sPEEK‐H2WO4‐5 had the highest proton conductivity (36.5 mS cm−1) which was comparable to Nafion117 in water at room temperature. On the other hand, the methanol permeabilities of the composite membranes were in the same order compared to sPEEK but showed minor changes depending on the added materials and their compositions. Among the membranes obtained by solution casting, sPEEK‐H2WO4‐5 was found to be the best composite membrane due to its high proton conductivity and acceptable methanol permeability. Layer‐by‐layer modified sPEEK membranes were also obtained in the study for comparison and it was found that sPEEK‐PAH/H2WO4‐2 displayed the best selectivity value.

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Section: Sulfonation Of Peekmentioning

confidence: 99%

Section: Characterization Of the Composite Membranesmentioning

confidence: 99%

Section: Ion Exchange Capacity and Sulfonation Degreementioning

confidence: 99%

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A comparative study on sPEEK‐based composite membranes with various inorganic fillers using different preparation routes for DMFCs

Dönmez

Gülcan

Deligöz

2023

Polymer Engineering & Sci

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“…Membranes based on these same components (SPEEK and thermoplastic PU) prepared by casting from a solution demonstrate thermal stability up to 190°C. The proton conductivity, water uptake, and ion exchange capacity of the membranes increased with the increase in the concentration of SPEEK and was 3.9-18.7 mS cm −1 [19].…”

Section: Introductionmentioning

confidence: 97%

Sodium p-Styrene Sulfonate–1-Vinylimidazole Copolymers for Acid–Base Proton-Exchange Membranes

Лебедева

Pozhidaev

Малахова

et al. 2020

Membr. Membr. Technol.

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Binary copolymers possessing thermal stability up to 290°C and suitable for the formation of ionexchange membranes have been obtained by free radical copolymerization of sodium p-styrene sulfonate and 1-vinylimidazole with subsequent conversion to the H-form. The composition and structure of the copolymers are confirmed by elemental analysis and IR and NMR spectroscopy. Multicomponent membranes based on the copolymers of sodium p-styrene sulfonate and 1-vinylimidazole have been obtained using poly(vinyl alcohol) crosslinked by oxalic acid as a film-forming agent. It is shown by scanning electron microscopy that the surface and cut of the membranes have a uniform structure. The specific electric conductivity of the membranes with different concentrations of styrene sulfonic acid (20 to 80 mol % in the copolymer) increases with an increase in the fraction of styrene sulfonic acid and is 29.5 to 52.0 mS cm −1 at 80°C. The activation energy of proton transport of the membranes is 12.5 to 15.5 kJ mol −1. The water uptake of the membranes decreases with the increase in the concentration of the basic (imidazole) component in them, which may be associated with the increase in the density of ionic crosslinking due to the acid-base interaction of the sulfo groups and pyridine nitrogen atoms of the imidazole cycle. The formation of acid-base pairs results in the formation of continuous proton transport channels in addition to the sulfonic acid channels, which is confirmed by the high values of specific electric conductivity even in the case of a decrease in the concentration of sulfostyrene in the composition of the membrane. Increasing the concentration of 1-vinylimidazole in the composition of the copolymer from 20 to 80 mol % leads to an increase in the relative elongation at break from 3 to 6%, an increase in the tensile strength at break from 4 to 7 MPa, a decrease in the Young modulus of the membranes from 127 to 102 MPa, and a decrease in the water uptake from 45 to 15.

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“…Both of them produce a drop in the mechanical properties, and consequently a reduction of electrochemical performance [10]. In order to maintain an adequate proton conductivity and preserve the mechanical properties, under low RH conditions, hygroscopic and/or proton conductor fillers are introduced into the membrane, as well as blending with other polymers, with the aim of maintaining the appropriate amount of water for proton conduction [11][12][13]. The fillers generally used for this purpose are composed of ceramic oxides or functionalized oxides, polymers with specific functional groups and organic compounds [14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Novel Polymeric Composite TPPS/s-PEEK Membranes for Low Relative Humidity PEFC

et al. 2020

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Composite membranes based on different wt percentages of meso-tetrakis-(4-sulfonatophenyl)porphyrin (TPPS) embedded in a medium sulfonation degree (50%) sulfonated poly(etheretherketone) (s-PEEK) were investigated. The successful introduction of porphyrin into the membranes and the characterization of its different species into the membrane ionic domains were carried out by spectroscopic techniques. Moreover, the effect of TPPS arrangement was investigated in terms of water retention, proton conductivity and fuel cell performance at low relative humidity (RH). It was found that the introduction of this porphyrin induces a variation of the chemical-physical parameters, such as ion exchange capacity (IEC), water up-take (Wup %) λ and proton concentration ([H+]), attributable to the interactions that occur between the sulfonic groups of the polymer and the nitrogen sites of TPPS. The TPPS, in its J-aggregated form, actively participates in the proton conduction mechanism, also maintaining the adequate water content in more drastic conditions (80 °C and 50% RH). A maximum power density value of 462 mW cm−2 was obtained for the s-PEEK membrane, with a 0.77 wt % content of TPPS. This evidence suggests that the presence of J-aggregates in the proton conduction channels maintains a good hydration, even if a drastic reduction of the RH of the reactant gases occurs, preventing the membrane from a dry-out effect.

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Blend membranes of sulfonated poly (ether ether ketone) and thermoplastic poly (urethane) for fuel cells

Cited by 12 publications

References 31 publications

A comparative study on sPEEK‐based composite membranes with various inorganic fillers using different preparation routes for DMFCs

A comparative study on sPEEK‐based composite membranes with various inorganic fillers using different preparation routes for DMFCs

Sodium p-Styrene Sulfonate–1-Vinylimidazole Copolymers for Acid–Base Proton-Exchange Membranes

Novel Polymeric Composite TPPS/s-PEEK Membranes for Low Relative Humidity PEFC

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