Preparation and evaluation of crosslinked sulfonated polyphosphazene with poly(aryloxy cyclotriphosphazene) for proton exchange membrane

Yan, Dong; Xu, Hulin; Fu, Fengyan; Zhu, Changjin

doi:10.1016/j.jechem.2016.03.013

Cited by 18 publications

(3 citation statements)

References 39 publications

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“…Selectivity is a significant value for PEM, which is defined as the ratio of proton conductivity to methanol permeability . The higher the selectivity of the membrane is, the better the membrane can perform as both a good conductor and a good separator in DMFCs .…”

Section: Resultsmentioning

confidence: 99%

Novel Proton Conducting Membranes from the Combination of Sulfonated Polymers of Polyetheretherketones and Polyphosphazenes Doped with Sulfonated Single‐Walled Carbon Nanotubes

Luo

Xu²,

et al. 2017

Macro Materials & Eng

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Intent on developing efficient proton exchange membranes used for direct methanol fuel cells as well as hydrogen fuel cells, a series of membranes based on sulfonated polyetheretherketone and sulfonated polyphosphazene‐graft copolymers is prepared by cross‐linking reaction because the former material has good enough mechanical property, while the latter is excellent in the proton transfer. The cross‐linked membranes combine the advantages of the two kinds of polymers. Among them, the membrane poly[(4‐trifluoromethylphenoxy)(4‐methylphenoxy)phosphazene]‐g‐poly {(styrene)11‐r‐[4‐(4‐sulfobutyloxy)styrene]33‐sulfonated poly(ether ether ketone)75 (CF3‐PS11‐PSBOS33‐SPEEK75) shows a proton conductivity at 0.143 S cm−1 under fully hydrated conditions at 80 °C and performs tensile strength about five times as much as did the sulfonated polyphosphazene membrane CF3‐PS11‐PSBOS33. Further doping of sulfonated single‐walled carbon nanotubes (S‐SWCNTs) into the cross‐linked membranes on the screening of additives gives composite membrane CF3‐PS11‐PSBOS33‐SPEEK75‐SWCNT possessing proton conductivity of 0.196 S cm−1, even higher than that of Nafion 117 and a tensile strength comparable to that of Nafion 117. However, this significance of the composite membrane in the proton conduction is not observed in the test with a H2/air fuel cell when it shows a maximal power density of 280 mW cm−2 at 80 °C, whereas 294 mW cm−2 is observed for CF3‐PS11‐PSBOS33‐SPEEK75.

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Section: Resultsmentioning

confidence: 99%

Novel Proton Conducting Membranes from the Combination of Sulfonated Polymers of Polyetheretherketones and Polyphosphazenes Doped with Sulfonated Single‐Walled Carbon Nanotubes

Luo

Xu²,

et al. 2017

Macro Materials & Eng

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“…However, it suffers from several shortcomings such as high fuel/gas diffusion, reduced mechanical property at elevated temperatures, poor recyclability, and significant manufacturing costs [10,11] . To explore alternative PEMs, worldwide researchers have focused on several sulfonated hydrocarbon polymers [12] , including sulfonated poly(aryl ether)s [13] , polyphosphazene [14] , polyimides [15] , poly(phenylene)s [16] , polystyrenes [17] , polybenzimidazoles [18] , etc. While much advancement has been achieved, there are still many challenges for these hydrocarbon-based PEMs to fully replace Nafion ® .…”

Section: Introductionmentioning

confidence: 99%

Tetra-alkylsulfonate functionalized poly(aryl ether) membranes with nanosized hydrophilic channels for efficient proton conduction

Zhou

Zhu

Lin

et al. 2020

Journal of Energy Chemistry

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“…34,35 Some acidic polymers, such as Nafion, 18 sulfonated polyarylene ether (SPAE), 36 sulfonated polyetheretherketone (SPEEK), 9 sulfonated polyethersulfone, 37 poly vinylphosphonic acid (PVPA) 38 and sulfonated polyimide (SPI), 39 have been used as proton conductors and showed acceptable performance. The sulfonated phenoxy polyphosphazene (POP) was another preferred candidates for proton conductor because it is easy to be synthesized 40 and modified such as sulfonation. Meanwhile, π-π interaction and strong hydrogen bonding network between phenoxy polyphosphazene (SPOP) and PBI would lead to good dispersion of SPOP in PBI, high proton conductivity, as well as better chemical stability under low humidity.…”

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confidence: 99%

Preparation and Properties of Covalently Crosslinked Polybenzimidazole High Temperature Proton Exchange Membranes Doped with High Sulfonated Polyphosphazene

Chuan-gang

Liu

Sun

et al. 2020

J. Electrochem. Soc.

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An insoluble sulfonated polyphosphazene (SPOP) with high degree of sulfonation is synthesized and used as the proton conductor in polybenzimidazole (PBI) high-temperature proton exchange membrane. Polyfunctional triglycidyl isocyanurate (TGIC) is used as covalent cross-linking agent to obtain a high proton conductivity at low cross-linking degrees. The composite membrane is characterized by Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscope (SEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD). SPOP has good compatibility with mPBI-TGIC, leading to uniform dispersion in the obtained membranes with neither phase separation nor agglomeration. As a highly efficient cross-linking agent, TGIC not only makes the composite membrane have good mechanical properties, thermal stability, anti-swelling and anti-oxidation properties at low crosslinking degrees, but also leads to high doping amount of SPOP, thus making the composite the membrane have a high proton conductivity. The conductivity of mPBI-TGIC(5%)/SPOP(50%) at 100% RH, 50% RH and 0 RH is 0.143, 0.076 and 0.044 S cm −1 at 180 °C, respectively. In addition, the composite membranes has good methanol resistance and selectivity, so the composite membrane can be applied in the direct methanol fuel cell.

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Preparation and evaluation of crosslinked sulfonated polyphosphazene with poly(aryloxy cyclotriphosphazene) for proton exchange membrane

Cited by 18 publications

References 39 publications

Novel Proton Conducting Membranes from the Combination of Sulfonated Polymers of Polyetheretherketones and Polyphosphazenes Doped with Sulfonated Single‐Walled Carbon Nanotubes

Novel Proton Conducting Membranes from the Combination of Sulfonated Polymers of Polyetheretherketones and Polyphosphazenes Doped with Sulfonated Single‐Walled Carbon Nanotubes

Tetra-alkylsulfonate functionalized poly(aryl ether) membranes with nanosized hydrophilic channels for efficient proton conduction

Preparation and Properties of Covalently Crosslinked Polybenzimidazole High Temperature Proton Exchange Membranes Doped with High Sulfonated Polyphosphazene

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