Improvement in the mechanical properties, proton conductivity, and methanol resistance of highly branched sulfonated poly(arylene ether)/graphene oxide grafted with flexible alkylsulfonated side chains nanocomposite membranes

Liu, Dong; Peng, Jinhua; Li, Zhuoyao; Liu, Bin; Wang, Lei

doi:10.1016/j.jpowsour.2017.12.057

Cited by 48 publications

(19 citation statements)

References 45 publications

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“…The increase in the PFPE-GO content from 0.1 to 2.0 wt % further decreased the water uptake values from 66.0% to 55.4% for the SPAES/PFPE-GO membranes and from 34.2 to 23.3% for the Nafion/PFPE-GO membranes, because the increase in the interfacial area between the polymer matrix (SPAES or Nafion) and the PFPE-GO having perfluoro polymer chains further restricts the chain motion and the free volume of polymer for water storage [49]. For example, in the case of SPAES/PFPE-GO, the entanglement interaction between the flexible perfluoroalkyl chains grafted in PFPE-GO and the SPAES backbone as well as the interaction between oxygen functional groups in GO and the sulfonic acid groups in SPAES affect the water absorption behavior [19].…”

Section: Resultsmentioning

confidence: 99%

“…Guiver et al reported remarkably increased mechanical properties of polymer composites by tuning interfacial interactions between 2D materials (GO and montmorillonite) and polymer matrix [18]. Wang et al reported an improvement in the mechanical properties and low methanol permeability of hydrocarbon-based PEM by the incorporation of flexible alkylsulfonated grafted GO [19]. Therefore, designing and fine tuning of carbon nanomaterials should be considered to achieve high performances of the polymer composite membranes [20,21,22,23,24].…”

Section: Introductionmentioning

confidence: 99%

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Sulfonated Poly(Arylene Ether Sulfone) and Perfluorosulfonic Acid Composite Membranes Containing Perfluoropolyether Grafted Graphene Oxide for Polymer Electrolyte Membrane Fuel Cell Applications

Lim

Kım

2018

Polymers

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Sulfonated poly(arylene ether sulfone) (SPAES) and perfluorosulfonic acid (PFSA) composite membranes were prepared using perfluoropolyether grafted graphene oxide (PFPE-GO) as a reinforcing filler for polymer electrolyte membrane fuel cell (PEMFC) applications. PFPE-GO was obtained by grafting poly(hexafluoropropylene oxide) having a carboxylic acid end group onto the surface of GO via ring opening reaction between the carboxylic acid group in poly(hexafluoropropylene oxide) and the epoxide groups in GO, using 4-dimethylaminopyridine as a base catalyst. Both SPAES and PFSA composite membranes containing PFPE-GO showed much improved mechanical strength and dimensional stability, compared to each linear SPAES and PFSA membrane, respectively. The enhanced mechanical strength and dimensional stability of composite membranes can be ascribed to the homogeneous dispersion of rigid conjugated carbon units in GO through the increased interfacial interactions between PFPE-GO and SPAES/PFSA matrices.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sulfonated Poly(Arylene Ether Sulfone) and Perfluorosulfonic Acid Composite Membranes Containing Perfluoropolyether Grafted Graphene Oxide for Polymer Electrolyte Membrane Fuel Cell Applications

Lim

Kım

2018

Polymers

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“…[33][34][35][36] Most cross-linkers used in AEMs contained one or more quaternary ammoniums to connect the polymer chains to increase the concentration of OH − , thus improving the ionic conductivity; however, ammoniums are easy to be attacked by OH − , resulting in decreased mechanical properties and alkaline stability. We have focused on developing proton/anion exchange membranes several years, 32,[37][38][39][40][41][42][43][44][45][46][47][48][49] herein, to improve the ionic conductivity of alkali-doped PBIs without scarifying mechanical robust and alkali stability. This paper introduced a novel kind of hyperbranched cross-linkers to PBI membranes ( Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Alkali‐doped hyperbranched cross‐linked polybenzimidazoles containing benzyltrimethyl ammoniums with improved ionic conductivity as alkaline direct methanol fuel cell membranes

Gao

Fang

et al. 2020

Int J Energy Res

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Summary Development of anion exchange membranes (AEMs) with good performance, such as high conductivity, good alkaline stability and mechanical strength, has been a hot topic for the fuel cell application. Here, a novel kind of hyperbranched cross‐linker decorated with quaternary ammonium groups was introduced to polybenzimidazole (PBI) membranes and QOPBI‐x membranes (where x is the weight ratio of the hyperbranched cross‐linker). Compared with the linear OPBI membrane (0.091 S cm−1), QOPBI‐x membranes displayed an improved ionic conductivity (up to 0.122 S cm−1) at 60°C after they were doped in 6 M KOH for 7 days. The KOH‐doped QOPBI‐x membranes also exhibited a high tensile strength (54.5‐61.7 MPa) and superior alkaline stability. There is almost no decline in the ionic conductivity after being immersed in a 6 M KOH solution for 30 days. In addition, the alkaline direct methanol fuel cell (ADMFC) performance based on the KOH‐doped OPBI and QOPBI‐x membranes is described. The QOPBI‐15 membrane displayed good performance (75.6 mW cm−2), which is 33.3% higher than the OPBI membrane (56.7 mW cm−2).

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“…In particular branched sulfonated polymer prepared with bisphenol fluorine monomer showed excellent stability in Fenton's reagent with outstanding proton conductivity . The performance of the branched polymer membranes can be further improved by mixing with suitable filler …”

Section: Introductionmentioning

confidence: 99%

“…7 The performance of the branched polymer membranes can be further improved by mixing with suitable filler. 9,10 Metal-organic frameworks (MOF) have been used in various fields such as catalysis, separation, adsorption, and drug delivery, etc. [11][12][13][14] Recently, MOFs were utilized as proton conductors in the field of energy material.…”

Section: Introductionmentioning

confidence: 99%

Improving the performance of sulfonated polymer membrane by using sulfonic acid functionalized hetero‐metallic metal‐organic framework for DMFC applications

et al. 2019

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Summary Proton transport played a crucial part in the fuel cells, sensors, and batteries. The electrolyte used in fuel cells should possess high proton conductivity and good chemical stability. Herein, taking advantage of the high proton conductivity of metal‐organic framework (MOF) and the good chemical stability of branched polymers, a new heterometallic mediated MOF (Zr‐Cr‐SO3H) is synthesized and utilized as a filler in the highly branched sulfonated polymer (BSP). In addition, Zr‐SO3H MOF is also prepared for comparison. Transmission electron microscope study shows that the prepared MOF particles are spherical in size and interconnected through nanosheets. The optimized quantity of MOFs inside the polymer matrix improves the water sorption, mechanical property, and proton conductivity. The composite membranes display an improved open‐circuit voltage than the pristine BSP membrane. By comparing the Zr‐SO3H MOF incorporated composite membrane, Zr‐Cr‐SO3H MOF incorporated composite membranes display higher proton conductivity and peak power density in a single‐cell test. In particular, the single‐cell fabricated with Zr‐Cr‐SO3H MOF incorporated composite membrane is able to reach the peak power density of 64.6 mWcm−2 at 60°C, which is 26% greater than the Nafion 212 membrane. Furthermore, this work offers a new strategy for the utilization of hetero‐metal MOF as a filler for proton exchange membrane applications.

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Improvement in the mechanical properties, proton conductivity, and methanol resistance of highly branched sulfonated poly(arylene ether)/graphene oxide grafted with flexible alkylsulfonated side chains nanocomposite membranes

Cited by 48 publications

References 45 publications

Sulfonated Poly(Arylene Ether Sulfone) and Perfluorosulfonic Acid Composite Membranes Containing Perfluoropolyether Grafted Graphene Oxide for Polymer Electrolyte Membrane Fuel Cell Applications

Sulfonated Poly(Arylene Ether Sulfone) and Perfluorosulfonic Acid Composite Membranes Containing Perfluoropolyether Grafted Graphene Oxide for Polymer Electrolyte Membrane Fuel Cell Applications

Alkali‐doped hyperbranched cross‐linked polybenzimidazoles containing benzyltrimethyl ammoniums with improved ionic conductivity as alkaline direct methanol fuel cell membranes

Improving the performance of sulfonated polymer membrane by using sulfonic acid functionalized hetero‐metallic metal‐organic framework for DMFC applications

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