Highly conductive and robustly stable anion exchange membranes with a star-branched crosslinking structure

Su, Xin; Nan, Songbo; Wei, Wei; Xu, Shicheng; He, Ronghuan

doi:10.1016/j.memsci.2023.121843

Cited by 24 publications

(6 citation statements)

References 51 publications

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“…The WU values of AEMs significantly impact the ionic conduction, but excess WU can dilute the ionic concentration within the membrane, leading to severe swelling issues [ 42 ]. Therefore, it is crucial to design a membrane with good water absorption and a restrained swelling ratio.…”

Section: Resultsmentioning

confidence: 99%

“…The IEC values of the ImPSF and ImPSF-PEGx membranes were almost identical to the theoretical IEC values, indicating the complete conversion of chloromethyl to imidazolium groups. The WU values of AEMs significantly impact the ionic conduction, but excess WU can dilute the ionic concentration within the membrane, leading to severe swelling issues [42]. Therefore, it is crucial to design a membrane with good water absorption and a restrained swelling ratio.…”

Section: Ion Exchange Capacity Water Uptake and Swelling Ratiomentioning

confidence: 99%

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A Hydrophilic Polyethylene Glycol-Blended Anion Exchange Membrane to Facilitate the Migration of Hydroxide Ions

Gao,

Jin,

et al. 2024

Polymers

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As one of the most important sources for green hydrogen, anion exchange membrane water electrolyzers (AEMWEs) have been developing rapidly in recent decades. Among these components, anion exchange membranes (AEMs) with high ionic conductivity and good stability play an important role in the performance of AEMWEs. In this study, we have developed a simple blending method to fabricate the blended membrane ImPSF-PEGx via the introduction of a hydrophilic PEG into the PSF-based ionic polymer. Given their hydrophilicity and coordination properties, the introduced PEGs are beneficial in assembling the ionic groups to form the ion-conducting channels. Moreover, an asymmetric structure is observed in ImPSF-PEGx membranes with a layer of finger-like cracks at the upper surface because PEGs can act as pore-forming agents. During the study, the ImPSF-PEGx membranes exhibited higher water uptake and ionic conductivity with lower swelling ratios and much better mechanical properties in comparison to the pristine ImPSF membrane. The ImPSF-PEG1000 membrane showed the best overall performance among the membranes with higher ionic conductivity (82.6 mS cm−1 at 80 °C), which was approximately two times higher than the conductivity of ImPSF, and demonstrated better mechanical and alkaline stability. The alkaline water electrolyzer assembled by ImPSF-PEG1000 achieved a current density of 606 mA cm−2 at 80 °C under conditions of 1 M KOH and 2.06 V, and maintained an essentially unchanged performance after 48 h running.

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Section: Resultsmentioning

confidence: 99%

Section: Ion Exchange Capacity Water Uptake and Swelling Ratiomentioning

confidence: 99%

A Hydrophilic Polyethylene Glycol-Blended Anion Exchange Membrane to Facilitate the Migration of Hydroxide Ions

Gao,

Jin,

et al. 2024

Polymers

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“…9 Therefore, AEMs based on the PAP backbone are more conducive to achieving a balance between conductivity and stability. Multiple strategies and structures are designed to regulate the microstructure of AEMs, such as increasing the free volume, 1,10–13 crosslinking, 14–17 comp-shaped structures 18,19 and long side chains. 20–22 Bulky or branched structural units can increase the inner free volume of AEMs, but also increase the membrane rigidity and brittleness.…”

Section: Introductionmentioning

confidence: 99%

Adjusting the perfluorinated side chain length in dual-grafted anion exchange membranes for high performance fuel cells

Gong,

Han,

Zhang

et al. 2024

J. Mater. Chem. A

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“…Inducing microphase separation for the creation of well-defined ion transport channels could achieve high conductivity of the membrane while maintaining good stability. Several side chain-type membranes have been reported, including comb-shaped structures, , multicationic side chains, − tail chains, − and ether-containing side chains. ,− Zhao et al explored the effects of terminal cations in side chains on the conductivity and stability of membranes, and the PTP-C5-MPi membrane containing piperidinium terminal cations shows the highest conductivity and long-term stability . The multicationic side chain strategy often leads to extremely high IECs.…”

Section: Introductionmentioning

confidence: 99%

Completely Methylene-Free Side Chain Enables Significant Microphase Separation at Medium IECs for Fuel-Cell Anion Exchange Membranes

Gong,

Liu,

Qaisrani

et al. 2024

ACS Appl. Mater. Interfaces

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The introduction of hydrophobic side chain structures in anion exchange membranes (AEMs) to facilitate ion transport has been widely studied; however, low or moderate hydrophobic hydrocarbon and semifluorinated side chains are insufficient to induce a high degree of microphase separation. Herein, we design and prepare poly(aryl piperidinium) AEMs with completely methylene-free perfluorinated side chains, which can maximize the thermodynamic incompatibility between main- and side chains, thus enhancing microphase separation at medium ion exchange capacities (IECs). According to the molecular dynamics study, the methylene-free perfluorinated side chain leads to better hydration of cations. The hydroxide conductivity of the methylene-free perfluorinated side chain-grafted PAP-pF-1 membrane reaches 124.9 mS cm–1 at 80 °C, and the PAP-sF-1 with semifluorinated side chains and PAP-CH-1 with hydrocarbon side chains show lower conductivity (116.8 and 104.0 mS cm–1). The H2/O2 fuel cell using the PAP-pF-1 membrane demonstrates a remarkable peak power density (1651 mW cm–2 at 80 °C) and durability (greater than 300 h). This work provides a novel insight into enhancing microphase separation in AEMs; it opens up new possibilities for developing high-performance AEMs.

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Highly conductive and robustly stable anion exchange membranes with a star-branched crosslinking structure

Cited by 24 publications

References 51 publications

A Hydrophilic Polyethylene Glycol-Blended Anion Exchange Membrane to Facilitate the Migration of Hydroxide Ions

A Hydrophilic Polyethylene Glycol-Blended Anion Exchange Membrane to Facilitate the Migration of Hydroxide Ions

Adjusting the perfluorinated side chain length in dual-grafted anion exchange membranes for high performance fuel cells

Completely Methylene-Free Side Chain Enables Significant Microphase Separation at Medium IECs for Fuel-Cell Anion Exchange Membranes

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