Synthesis and properties of highly branched star-shaped sulfonated block polymers with sulfoalkyl pendant groups for use as proton exchange membranes

Xie, Hui; Tao, Dan; Ni, Jiangpeng; Xiang, Xiongzhi; Gao, Chunmei; Wang, Lei

doi:10.1016/j.memsci.2015.09.035

Cited by 65 publications

(23 citation statements)

References 39 publications

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“…Initially, membrane samples were preheated for 10 minutes at 150°C for moisture elimination. From the thermogram (Figure ), all the prepared membranes displayed two‐stage weight loss, and these results were consistent with previously reported branched polymers . The first weight loss is found between 230°C and 360°C, which is due to the desulfonation process .…”

Section: Resultssupporting

confidence: 88%

Highly branched poly(arylene ether)/surface functionalized fullerene‐based composite membrane electrolyte for DMFC applications

et al. 2019

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Summary Sulfonated branched polymer membranes have been gaining immense attention as the separator in energy‐related applications especially in fuel cells and flow batteries. Utilization of this branched polymer membranes in direct methanol fuel cell (DMFC) is limited because of large free volume and high methanol permeation. In the present work, sulfonated fullerene is used to improve the methanol barrier property of the highly branched sulfonated poly(ether ether ketone sulfone)s membrane without sacrificing its high proton conductivity. The existence of sulfonated fullerene with larger size and the usage of small quantity in the branched polymer matrix effectively prevent the methanol transportation channel across the membrane. The composite membrane with an optimized loading of sulfonated fullerene displays the highest proton conductivity of 0.332 S cm−1 at 80°C. Radical scavenging property of the fullerene improves the oxidative stability of the composite membrane. Composite membrane exhibits the peak power density of 74.38 mW cm−2 at 60°C, which is 30% larger than the commercial Nafion 212 membrane (51.78 mW cm−2) at the same condition. From these results, it clearly depicts that sulfonated fullerene‐incorporated branched polymer electrolyte membrane emerges as a promising candidate for DMFC applications.

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Section: Resultssupporting

confidence: 88%

Highly branched poly(arylene ether)/surface functionalized fullerene‐based composite membrane electrolyte for DMFC applications

et al. 2019

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“…Due to the robust aromatic backbone, the maximum tensile strengths of l‐SPI and Fb‐SPI membranes are higher than that of Nafion 117 membrane. And the tensile strengths of all Fb‐SPI membranes are higher than that of l‐SPI membrane, since Fb‐SPI membranes with special three‐dimensional network structures have more steric hindrance to restrain the chains’ mobility, and similar results was reported elsewhere ,. In addition, the maximum tensile strengths of Fb‐SPI membranes show a decreasing trend as the content of TFAPOB increases.…”

Section: Resultssupporting

confidence: 82%

“…And the temperature at the maximum mass loss speed of third‐step mass loss of l‐SPI and Fb‐SPI membranes is 572 °C and 584∼591 °C, respectively. These results demonstrate that the hydrophobic −CF 3 groups and three‐dimensional network increase the thermal stabilities of −SO 3 H groups and main chains of Fb‐SPI membranes . Therefore, sufficiently high decomposition temperature of −SO 3 H groups and main chains demonstrates that as‐prepared Fb‐SPI membranes are thermally stable enough for VRFB application because the operation temperature of VRFB is usually lower than 60 °C.…”

Section: Resultsmentioning

confidence: 73%

Fluorine‐Containing Branched Sulfonated Polyimide Membrane for Vanadium Redox Flow Battery Applications

et al. 2018

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A series of fluorine‐containing branched sulfonated polyimide (Fb‐SPI) membranes with different degrees of branching (0–12 %) were synthesized through polycondensation. The chemical structure of Fb‐SPI‐10 membrane was confirmed using ATR‐FTIR and 1H NMR spectroscopy. The physico‐chemical properties of Fb‐SPI membranes were systematically investigated and compared to linear SPI (l‐SPI) and Nafion 117 membranes. The vanadium‐ion permeabilities of Fb‐SPI membranes (2.45–0.99×10−7 cm2 min−1) are much lower than that of Nafion 117 (17.1×10−7 cm2 min−1) membranes. Besides, the chemical stability of Fb‐SPI membranes is superior to that of l‐SPI membranes. During 500‐time continuous cyclic charge‐discharge measurements, the VRFB assembled with a Fb‐SPI‐10 membrane shows higher coulombic efficiency (98.4–99.7 %), higher or close energy efficiency (69.0–79.7 %) from 40 to 80 mA cm−2, and higher or close capacity retention (52.8–100 %) from 40 to 70 mA cm−2 compared with a device using a Nafion 117 membrane. All of these results demonstrate that the as‐selected Fb‐SPI‐10 membrane has promising potential for VRFB applications.

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“…The single stack PEMFC delivered a maximum power density of 1.15 × 10 3 W m −2 operated at 70 °C and 50% RH, also outperformed NAFION. Xie et al synthesized two highly branched star‐shaped sulfonated block poly(arylene ether sulfone) (PAES) containing sulfoalkyl pendant groups . Both star‐shaped block copolymers, with hydrophilic segments surrounded by hydrophobic segments and with hydrophobic segments surrounded by hydrophilic segments, exhibited high proton conductivities of 42.0 and 30.0 S m −1 at 80 °C and 100% RH, higher than the random copolymers and NAFION 117.…”

Section: Achievements Of the Nanophase Separation Technologiesmentioning

confidence: 68%

Improving the Overall Characteristics of Proton Exchange Membranes via Nanophase Separation Technologies: A Progress Review

Yan

et al. 2017

Fuel Cells

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Proton exchange membrane (PEM) is one of the essential materials for proton exchange membrane fuel cells (PEMCF). The improvement of comprehensive characteristics of proton exchange membrane represents one of the most critical challenges for the large scale commercialization of proton exchange membrane fuel cells. In this paper, we review the recent developments of proton exchange membrane via nanophase separation technologies.

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Synthesis and properties of highly branched star-shaped sulfonated block polymers with sulfoalkyl pendant groups for use as proton exchange membranes

Cited by 65 publications

References 39 publications

Highly branched poly(arylene ether)/surface functionalized fullerene‐based composite membrane electrolyte for DMFC applications

Highly branched poly(arylene ether)/surface functionalized fullerene‐based composite membrane electrolyte for DMFC applications

Fluorine‐Containing Branched Sulfonated Polyimide Membrane for Vanadium Redox Flow Battery Applications

Improving the Overall Characteristics of Proton Exchange Membranes via Nanophase Separation Technologies: A Progress Review

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