Improvement the hydroxide conductivity and alkaline stability simultaneously of anion exchange membranes by changing quaternary ammonium and imidazole contents

Yang, Kai; Ni, Hongzhe; Du, Xinming; Shui, Tianen; Shen, Hongcheng; Xu, Jingmei; Liu, Yao; Li, Chenyang; Gao, Yepeng; Wang, Zhe

doi:10.1002/er.6698

Cited by 8 publications

(5 citation statements)

References 87 publications

(81 reference statements)

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“…The ion exchange capacity (IEC) is referred to the number of ions that may be exchanged in an AEM. Theoretically, a high ionic conductivity can be realized by raising the IEC; however, undesirable WU and membrane volume changes will occur with an extremely high IEC, further diminishing the mechanical properties and dimensional stability of the membrane. , According to Table , the content of QA and IEC value increase correspondingly with the increase of the contents of VBC and PQ 10 . As for QVP x – y AEMs, the strong bonds among IPN make it possible for the low WU and SR (even under high IEC conditions).…”

Section: Resultsmentioning

confidence: 99%

Tripartite Cationic Interpenetrating Polymer Network Anion Exchange Membranes for Fuel Cells

Zhao

Yang

Zhang

et al. 2023

ACS Appl. Energy Mater.

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To facilitate large-scale commercial applications of anion exchange membrane fuel cells, high ionic conductivity and long-term durability of anion exchange membranes (AEMs) are crucial. Herein, poly(styrene-co-4-vinylbenzyl chloride) (PSVBC) without aryl ether linkages was synthesized by the radical bulk polymerization using styrene (St) and 4-vinylbenzyl chloride (VBC) as monomers. Then, using PSVBC as the framework material and secondary anion carrier, and polyquaternium-10 (PQ 10 ) as the main anion carrier, the tripartite cationic full-interpenetrating polymer network (F-IPN QPSVBC-PQ 10 ) AEMs were fabricated by the chemical crosslinking method. Upon preparation, the AEMs with distinctive nano-sized microphase separation can maintain a suitable swelling capability, assuring stable mechanical properties, dimensional stability, alkaline stability, and oxidation resistance, surpassing their semi-interpenetrating polymer network QPSVBC-PQ 10 AEM counterpart. Specifically, the ionic conductivity and peak power density of the optimally formulated AEM were 81.89 mS/cm and 119.31 mW/cm 2 , respectively. Meanwhile, 91.06% of the initial mass and 88.37% of the original ionic conductivity were maintained after successive 10-day oxidation test and 30-day alkali resistance test. In summary, the unique design of tripartite cationic F-IPN QPSVBC-PQ 10 AEMs without aryl ether linkages is undoubtedly beneficial to further promote the development of high-performance anion exchange membranes.

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Section: Resultsmentioning

confidence: 99%

Tripartite Cationic Interpenetrating Polymer Network Anion Exchange Membranes for Fuel Cells

Zhao

Yang

Zhang

et al. 2023

ACS Appl. Energy Mater.

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“…Research conducted in the last few years in the area of AEM development for alkaline fuel cells has produced exciting membrane materials with improved alkaline stability. − The advances made in cation stability are enabling new materials to be investigated for AEMs and, with their associated hydroxide conductivities, supporting AEM electrochemical devices as alternatives to commercialized proton exchange membranes. AEMs for use in electrochemical devices including alkaline fuel cells have significant advantages over proton exchange membranes because they have potential to utilize platinum group metal (PGM) free catalysts, and the oxidation–reduction reaction kinetics are faster under high pH conditions. − However, device performance and operational lifetime are dependent on the ionic conductivity and chemical durability of the membrane material.…”

Section: Introductionmentioning

confidence: 99%

Effect of Block Length on the Properties of Multiblock Polysulfone-Poly(diallylpiperidinium hydroxide) Anion Exchange Membranes

et al. 2023

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Research in anion exchange membranes (AEM)s has continued with the development of materials bearing base stable cations. Designing AEMs that microphase separate into hydroxide conductive, hydrophilic domains within a hydrophobic and mechanically robust matrix has been shown to be successful for improving AEM performance. A series of multiblock polysulfone-poly(diallylpiperidinium hydroxide) copolymers (PSf-PDApipOH) of similar hydrophobic/hydrophilic composition was prepared in which the molecular weight of the hydroxide conducting PDApipOH segments was varied. The variable hydrophilic segment molecular weight was designed to assess the impact on microphase separation, hydroxide conductivity, and water management. The multiblock copolymers investigated were prepared by condensation polymerization of preformed 4-fluorophenyl sulfone terminated poly(diallylpiperidinium hexafluorophosphate) (PDApipPF6) oligomers with polysulfone monomers. The structure–property relationship between the molecular weight of the conductive PDApipOH segments and AEM performance was demonstrated by evaluation of the microphase separation, water uptake, and hydroxide conductivity. Membranes fabricated from the polysulfone-poly(diallylpiperidinium hexafluorophosphate) (PSf-PDApipPF6) multiblock copolymers were shown to form well-connected conductive domains by SAXS and atomic force microscopy experiments. The PSf-PDApipOH membranes were highly conductive with the maximum hydroxide conductivity reaching 62.9 mS·cm–1 at 60 °C and 95% relative humidity. Furthermore, it was demonstrated that the conductivity increased with increasing PDApipOH segment molecular weight.

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“…In the research work of anion exchange membranes, the introduction of trimethylamine as a quaternization reagent to form QA‐type transport sites is a common method to improve the conductivity of anion exchange membranes. Meanwhile, a large number of studies have shown that the increase of ionic conductivity would greatly increase the water uptake (WU) and swelling rate of the membrane, and reduce the dimensional stability of the membrane 8–10 . Therefore, further balancing ionic conductivity and mechanical properties is a key issue we must face in our work.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, a large number of studies have shown that the increase of ionic conductivity would greatly increase the water uptake (WU) and swelling rate of the membrane, and reduce the dimensional stability of the membrane. [8][9][10] Therefore, further balancing ionic conductivity and mechanical properties is a key issue we must face in our work.…”

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confidence: 99%

A novel anion exchange membrane based on silicone/polyphenylene oxide with excellent ionic conductivity for AEMFC

Liu

Wang

Sui

et al. 2022

Polymers for Advanced Techs

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To achieve good stability of anion‐exchange membranes. We report an organic–inorganic composite anion exchange membrane based on polyphenylene oxide (PPO) and 3‐[2‐(2‐aminoethylamino)ethylamino]propyl‐trimethoxysilane to improve dimensional stability and mechanical stability without affecting ionic conductivity. The successful synthesis of the membranes was confirmed by FT‐IR, 1H NMR, and EDX. The SiOSi three‐dimensional network cross‐linked structure was formed inside the anion‐exchange membranes by added inorganic fillers. It suppressed the swelling behavior of the membrane after water uptake, with water uptake rate of 48.2%–55.6% and swelling rate of 3.1%–14.2%. It improved the mechanical strength of the membranes with tensile strength of 33.5–37.8 MPa as the ratio of the membrane structure varied. Meanwhile, the flexible chain segments in the polymer structure contributed to the formation of microscopic phase separation structures, and the constructed ion‐conducting channels enabled QPPO‐Si‐5 to reach the highest hydroxide ion conductivity of 78.7 mS/cm at 80°C (ion exchange capacity [IEC] value of 1.2 mmol/g). QPPO‐Si‐1 exhibited better long‐term chemical stability, retaining 48.3% of the initial conductivity (30.8 mS/cm) after 600 h of alkali stability testing at 80°C in 1 M KOH solution. In conclusion, the results of this study provide a facile synthetic strategy with improved membrane's comprehensive performance.

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Improvement the hydroxide conductivity and alkaline stability simultaneously of anion exchange membranes by changing quaternary ammonium and imidazole contents

Abstract: A series of cross-linked anion exchange membranes (AEMs) base on poly (aryl ether ketone)s (PAEKS) with different contents of trimethylamine and

Cited by 8 publications

References 87 publications

Tripartite Cationic Interpenetrating Polymer Network Anion Exchange Membranes for Fuel Cells

Tripartite Cationic Interpenetrating Polymer Network Anion Exchange Membranes for Fuel Cells

Effect of Block Length on the Properties of Multiblock Polysulfone-Poly(diallylpiperidinium hydroxide) Anion Exchange Membranes

A novel anion exchange membrane based on silicone/polyphenylene oxide with excellent ionic conductivity for AEMFC

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