Macromolecular crosslinked poly(aryl piperidinium)-based anion exchange membranes with enhanced ion conduction for water electrolysis

Wang, Xiuqin; Fang, Zeyang; Zhang, Min; Xie, Shilei; Xie, Dong; Liu, Peng; Wang, Shoushan; Cheng, Faliang; Xu, Tongwen

doi:10.1016/j.memsci.2024.122717

Cited by 13 publications

(3 citation statements)

References 40 publications

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“…The second-fastest decomposition temperature (T FD 2) was about 420 °C, and this is due to the decomposition of the polymer backbone [ 30 ]. It is shown that the thermal decompositions of ImPSF-PEGx membranes can meet the practical requirements of the electrolyzer [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

“…The second-fastest decomposition temperature (T FD 2) was about 420 • C, and this is due to the decomposition of the polymer backbone [30]. It is shown that the thermal decompositions of ImPSF-PEGx membranes can meet the practical requirements of the electrolyzer [47]. The thermal stability of an AEM determines its upper temperature limit while functioning in an anion exchange membrane water electrolyzer (AEMWE) system.…”

Section: Mechanical and Thermal Stabilitymentioning

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: Mechanical and Thermal Stabilitymentioning

confidence: 99%

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

Gao,

Jin,

et al. 2024

Polymers

View full text Add to dashboard Cite

show abstract

“…Therefore, it is imperative to enhance conductivity while maintaining a low swelling ratio. Over the past decade, a number of polymer structures have been developed with the objective of facilitating microphase separation in the membrane [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ], such as graft structure [ 14 ], comb structure [ 12 , 13 ] and block structure [ 15 , 17 ]. These structures can facilitate microphase separation and construction of ion channels in the membrane, thereby achieving high conductivity at low IEC.…”

Section: Introductionmentioning

confidence: 99%

Anion Exchange Membrane with Pendulous Piperidinium on Twisted All-Carbon Backbone for Fuel Cell

Zhang,

Song,

Sun

et al. 2024

Membranes

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As a central component for anion exchange membrane fuel cells (AEMFCs), the anion exchange membrane is now facing the challenge of further improving its conductivity and alkali stability. Herein, a twisted all-carbon backbone is designed by introducing stereo-contorted units with piperidinium groups dangled at the twisted sites. The rigid and twisted backbone improves the conduction of hydroxide and brings down the squeezing effect of the backbone on piperidine rings. Accordingly, an anion exchange membrane prepared through this method exhibits adapted OH− conductivity, low swelling ratio and excellent alkali stability, even in high alkali concentrations. Further, a fuel cell assembled with a such-prepared membrane can reach a power density of 904.2 mW/cm2 and be capable of continuous operation for over 50 h. These results demonstrate that the designed membrane has good potential for applications in AEMFCs.

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Tuning the Performance of Poly(quaterphenyl piperidinium) Anion‐Exchange Membranes by Monomer Configuration

Bakvand,

Pan,

Allushi

et al. 2024

Advanced Energy Materials

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Poly(arylene piperidinium)s are attractive anion exchange membranes (AEMs) for alkaline membrane fuel cells and water electrolyzers because of their high chemical stability and hydroxide conductivity. Here, ether‐ and fluorine‐free hydroxide conducting poly(quaterphenyl piperidinium) membranes with very similar ion exchange capacity (IEC), but different ratios of meta to para connectivity in the quaterphenyl units, are synthesized and explored. Ionic clustering, water uptake, and the hydroxide conductivity of the AEMs increase gradually with increasing backbone flexibility, i.e., the fraction of meta connectivity. At 80 °C, the AEMs with para,para‐ and meta,meta‐quaterphenyl units, respectively, reach a conductivity of 96 and 178 mS cm−1, respectively, at a water uptake of 37 and 209%, respectively. Alkaline stability evaluations reveal high alkaline stability, increasing with backbone flexibility. Under very harsh conditions, the cationic loss increases with chain stiffness and occurs mainly through Hofmann β‐elimination, but also increasingly via nucleophilic methyl substitution. Copolymerization of quaterphenyls provides properties in between the corresponding homopolymers. In conclusion, it is demonstrated that the configuration of the quaterphenyl monomer can be efficiently tailored to manipulate the chain flexibility of highly alkali‐stable AEMs for control over the water uptake and ionic conductivity in a wide range without changing the ionic content of the membranes.

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Macromolecular crosslinked poly(aryl piperidinium)-based anion exchange membranes with enhanced ion conduction for water electrolysis

Cited by 13 publications

References 40 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

Anion Exchange Membrane with Pendulous Piperidinium on Twisted All-Carbon Backbone for Fuel Cell

Tuning the Performance of Poly(quaterphenyl piperidinium) Anion‐Exchange Membranes by Monomer Configuration

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