A Review of Nanostructured Ion‐Exchange Membranes

Shehzad, Muhammad Aamir; Yasmin, Aqsa; Ge, Xiaolin; Wu, Liang; Xu, Tongwen

doi:10.1002/admt.202001171

Cited by 31 publications

(17 citation statements)

References 198 publications

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“…Therefore, extending the theoretical framework and/or the establishment of a new one is strongly required for the rational design of NF-based IEMs with improved ionic transport properties. We be-lieve that such endeavors will position IEX-NFs as key building blocks for "Nanostructured Ion-Exchange Membranes" [161], with a significant expansion of their applications.…”

Section: Future and Outlookmentioning

confidence: 99%

De Novo Ion-Exchange Membranes Based on Nanofibers

2021

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The unique functions of nanofibers (NFs) are based on their nanoscale cross-section, high specific surface area, and high molecular orientation, and/or their confined polymer chains inside the fibers. The introduction of ion-exchange (IEX) groups on the surface and/or inside the NFs provides de novo ion-exchangers. In particular, the combination of large surface areas and ionizable groups in the IEX-NFs improves their performance through indices such as extremely rapid ion-exchange kinetics and high ion-exchange capacities. In reality, the membranes based on ion-exchange NFs exhibit superior properties such as high catalytic efficiency, high ion-exchange and adsorption capacities, and high ionic conductivities. The present review highlights the fundamental aspects of IEX-NFs (i.e., their unique size-dependent properties), scalable production methods, and the recent advancements in their applications in catalysis, separation/adsorption processes, and fuel cells, as well as the future perspectives and endeavors of NF-based IEMs.

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Section: Future and Outlookmentioning

confidence: 99%

De Novo Ion-Exchange Membranes Based on Nanofibers

2021

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“…Several macroscopic properties of PEMs including WU, SR, and proton conductivity have been discussed above, which are crucially affected by the inherent microscopic morphology of membranes . To obtain an insight into the nanoscale phase morphology of B-12.5-SPAEKS-graft- x membranes, the membranes were stained with lead ions in advance and then measured with small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) under a vacuum condition, and the results are depicted in Figure .…”

Section: Resultsmentioning

confidence: 99%

Highly Branched Poly(arylene ether ketone sulfone)s Bearing Flexible Sulfoalkyl Side Chains for Proton Exchange Membranes

Xie

Liu

Ringuette

et al. 2022

ACS Appl. Energy Mater.

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The crucial impact of the elevated degree of branching (DB) on improving the properties of proton exchange membranes (PEMs) has been demonstrated, yet PEMs (employing the B 3 monomer as the branching agent) with DB values exceeding 10% have not been reported. Herein, we report on the synthesis of a series of highly branched sulfonated poly(arylene ether ketone sulfone) copolymers bearing a 12.5% DB value for PEMs, namely, B-12.5-SPAEKS-x (where x represents the molar ratio of the monomer attaching the sulfoalkyl chain to the employed bisfluoride monomers). To accomplish this, a triphenol derivative was designed as the branching agent to reduce the possibility of macroscopic cross-linking during polymerization, and the flexible sulfoalkyl side chains were grafted to the polymer backbone to enhance the chain entanglement of the copolymers. Among all of the fabricated membranes, the B-12.5-SPAEKS-graft-40 membrane exhibited comparable proton conductivity (118.6 mS cm −1 ) and swelling change (20.7%) with those of Nafion 117 in a fully hydrated state at 80 °C, realizing the trade-off between the proton conductivity and dimensional stability. Furthermore, the proton conductivity of the B-12.5-SPAEKS-graft-50 membrane was evidently superior to that of Nafion 117 in both the fully hydrated state and high relative humidity conditions; therefore, a higher maximum power density of 529.5 mW cm −2 was achieved in the H 2 /air fuel cell.

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“…Oftentimes, the membrane or separator is a barrier toward electrons, while allowing the selective permeation of charged species such as ions or molecules. Characteristically, the membranes carry positive or negative fixed charges, which allow the passage of ions (Shin et al, 2017;Shehzad et al, 2021). Fuel cell membranes, such as proton exchange membranes (PEM) and anion exchange membranes (AEM) face substantial hurdles in cost and durability, quite apart from their task of maintaining high ion conductivity under various adverse environmental conditions such as elevated temperature and reduced humidity (Mustain et al, 2020;Jiao et al, 2021), but some approaches to achieving longer-term stability have been achieved (Liu et al, 2021b;Liu et al, 2022).…”

Section: Specialty Section: Membrane Formation and Structurementioning

confidence: 99%

Field Grand Challenge for Membrane Science and Technology

Guiver

2022

Front. Membr. Sci. Technol.

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A Review of Nanostructured Ion‐Exchange Membranes

Cited by 31 publications

References 198 publications

De Novo Ion-Exchange Membranes Based on Nanofibers

De Novo Ion-Exchange Membranes Based on Nanofibers

Highly Branched Poly(arylene ether ketone sulfone)s Bearing Flexible Sulfoalkyl Side Chains for Proton Exchange Membranes

Field Grand Challenge for Membrane Science and Technology

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