Hybrid anion exchange membranes with self‐assembled ionic channels

Liang, Na; Tu, Yufei; Xu, Jing; Chen, Dongzhi; Zhang, Hongwei

doi:10.1002/adv.21831

Cited by 6 publications

(2 citation statements)

References 38 publications

(54 reference statements)

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“…The fundamental purpose of this study was to synthesize AEMs with high hydroxide ion conductivities and good dimensional stabilities. It has long been known that the ion conductivities of AEMs are commonly governed by three factors: the ion intrinsic mobility, ion-exchanging group density, and nanochannel morphology. − Generally, higher concentrations of quaternary functional groups, which yield higher IECs, result in excessive WU . On the other hand, one of the necessities of anion transportation and nanochannel continuity is the appropriate water content in AEMs, but the dimensional stability was reduced by excessive WU .…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Hydroxide Conduction by Incorporation of Metal–Organic Frameworks into a Semi-Interpenetrating Network

et al. 2019

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In order to overcome the trade-off barrier between conductivity and stability in anion exchange membranes and also to investigate the effect of the metal–organic framework (MOF) to resolve this limitation, two membranes (semi-interpenetrating network (semi-IPN) and semi-IPN MOF) were prepared through using the solution casting method. The membranes were characterized by FT-IR, 1H NMR, BET, scanning electron microscopy, and thermogravimetric analysis. Moreover, the effect of metal–organic frameworks was accurately investigated on the membrane features such as ion exchange capacity, water uptake, swelling ratio, hydroxide ion conductivity, thermal and mechanical properties, methanol crossover, single-cell performance, and alkaline stability. The results indicated that the enhancement of ion exchange capacity (1.92 mequiv·g–1 vs 2.40 mequiv·g–1) caused by increased quaternary functional groups resulted in higher water uptake (48% vs 73%). In contrast, the cross-linked networks along with the robust metal–organic frameworks prevented the membranes from the excessive swelling ratio (a swelling ratio of 7%). Finally, the robust, porous, and hydrophilic Cr-MIL-101-NH2 frameworks via the construction of well-connected hydrophilic nanochannels significantly enhanced and facilitated hydroxide ion conductivities (0.07 S cm–1vs 0.01 S cm–1 at 30 °C). This strategy is a promising method to resolve the trade-off issue between hydroxide ion conductivity and swelling in anion exchange membranes.

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Section: Resultsmentioning

confidence: 99%

Enhancement of Hydroxide Conduction by Incorporation of Metal–Organic Frameworks into a Semi-Interpenetrating Network

et al. 2019

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“…Apart from increasing the IEC, construction of ion transport channels has been verified to be an efficient approach to promote ion conduction. The main methods include microphase separation, − interpenetrating polymer networks, − nanocomposites, − and so forth. As one of the most representative methods, microphase separation introduces a continuous phase which is functionalized with ion exchange groups, leading to high conductivity and good mechanical properties at low IEC.…”

Section: Introductionmentioning

confidence: 99%

Achieving High Conductivity at Low Ion Exchange Capacity for Anion Exchange Membranes with Electrospun Polyelectrolyte Nanofibers

Duan

Cheng

Zeng

et al. 2020

ACS Appl. Energy Mater.

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There has been a "trade-off" between ion exchange capacity (IEC) and mechanical properties in anion exchange membranes. Thinking out of the box, high ion conductivity was realized with only a small amount of ion exchange groups (means low IEC) in this work, by way of constructing highly effective ion channels with electrospun polyelectrolyte nanofibers. At a low IEC of 1.02 mmol g −1 , the conductivity of quaternized poly(2,6-dimethyl-1,4-phenylene oxide) nanofiber (QPPONF)/poly(vinyl alcohol) (QPPONF/PVA) composite membranes achieved was 51.5 mS cm −1 at 60 °C, which was much higher than that of the homogenous QPPO casting membrane (20.3 mS cm −1 at 60 °C, IEC = 1.04 mmol g −1 ). Moreover, 70 wt % QPPONF/PVA composite membrane exhibits an excellent peak power density of 791 mW cm −2 in the H 2 /O 2 fuel cell test.

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Highly durable poly(arylene piperidinium) composite membranes modified with polyhedral oligomeric silsesquioxane for fuel cell and water electrolysis application

Thuc

Jeon

et al. 2022

Journal of Membrane Science

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Hybrid anion exchange membranes with self‐assembled ionic channels

Cited by 6 publications

References 38 publications

Enhancement of Hydroxide Conduction by Incorporation of Metal–Organic Frameworks into a Semi-Interpenetrating Network

Enhancement of Hydroxide Conduction by Incorporation of Metal–Organic Frameworks into a Semi-Interpenetrating Network

Achieving High Conductivity at Low Ion Exchange Capacity for Anion Exchange Membranes with Electrospun Polyelectrolyte Nanofibers

Highly durable poly(arylene piperidinium) composite membranes modified with polyhedral oligomeric silsesquioxane for fuel cell and water electrolysis application

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