Bent-twisted block copolymer anion exchange membrane with improved conductivity

Zhang, Kuibo; Gong, Shoutao; Zhao, Biying; Liu, Yanxiang; Qaisrani, Naeem Akhtar; Li, Lingdong; Zhang, Fengxiang; He, Gaohong

doi:10.1016/j.memsci.2017.12.044

Cited by 66 publications

(36 citation statements)

References 68 publications

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“…[34] More recent developments based on fluorinated block copolymers for anion exchange membranes with high free volume for hydroxide ion transport have been reported. [35] Surface modification for water-based separations…”

Section: Self-assembly Of Block Copolymers In Solutionmentioning

confidence: 99%

Block Copolymer Membranes

Nunes

2020

Sustainable Nanoscale Engineering

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Section: Self-assembly Of Block Copolymers In Solutionmentioning

confidence: 99%

Block Copolymer Membranes

Nunes

2020

Sustainable Nanoscale Engineering

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“…In order to compare with other materials, the stability factor (Κ), which is the ratio of conductivity at 80 °C after 12 days of immersion in strong alkaline condition to the original value at the same temperature was calculated according to Eq. (8).…”

Section: Introduction Of Imidazolium Group and Conversion Into Ohˉ Formmentioning

confidence: 99%

“…formation of hydrophobic/hydrophilic block co-polymers 8,17,18 , pore-filling of porous substrates with cationic electrolyte 19,20 , enhancement of the channel orientation by employing a DC electric field while casting the polymer solution 21 and the use of nanofibrous substrate to host cationic electrolytes 22 . Particularly, nanofibrous composite films were evaluated for fabrication of highly conductive and robust AEMs following the pioneering work for the preparation of nanofibrous composite PEMs by Pintauro and coworkers [23][24][25] .…”

mentioning

confidence: 99%

Highly conductive anion exchange membranes based on polymer networks containing imidazolium functionalised side chains

Abouzari‐Lotf

Jacob

Ghassemi

et al. 2021

Sci Rep

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Two novel types of anion exchange membranes (AEMs) having imidazolium-type functionalised nanofibrous substrates were prepared using the facile and potentially scalable method. The membranes’ precursors were prepared by graft copolymerization of vinylbenzyl chloride (VBC) onto syndiotactic polypropylene (syn-PP) and polyamide-66 (PA-66) nanofibrous networks followed by crosslinking with 1,8-octanediamine, thermal treatment and subsequent functionalisation of imidazolium groups. The obtained membranes displayed an ion exchange capacity (IEC) close to 1.9 mmol g–1 and ionic (OH-) conductivity as high as 130 mS cm–1 at 80 °C. This was coupled with a reasonable alkaline stability representing more than 70% of their original conductivity under accelerated degradation test in 1 M KOH at 80 °C for 360 h. The effect of ionomer binder on the performance of the membrane electrode assembly (MEA) in AEM fuel cell was evaluated with the optimum membrane. The MEA showed a power density of as high as 440 mW cm−2 at a current density is 910 mA cm−2 with diamine crosslinked quaternized polysulfone (DAPSF) binder at 80 °C with 90% humidified H2 and O2 gases. Such performance was 2.3 folds higher than the corresponding MEA performance with quaternary ammonium polysulfone (QAPS) binder at the same operating conditions. Overall, the newly developed membrane was found to possess not only an excellent combination of physico-chemical properties and a reasonable stability but also to have a facile preparation procedure and cheap ingredients making it a promising candidate for application in AEM fuel cell.

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“…IEC value, which reflects the amount of exchangable conductive group, to a great extent determines the water uptake and conductivity . CS, an alkalescence polymer, has many NH 2 groups (6.2 mmol g −1 theoretically) that can conduct OH − by the hydrolysis of NH 2 (NH 2 + H 2 O = NH 3 + + OH − ).…”

Section: Resultsmentioning

confidence: 99%

Simultaneously enhanced conductivity and dimensional stability of AAEM by crosslinked polymer microsphere with dense carrier sites

Liu

Sun

2018

J of Applied Polymer Sci

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The search for practically applicable alkaline anion exchange membrane (AAEM) has been of continuous interest during the past decades. One of the main obstacles for current AAEM lies in the trade‐off between hydroxide conductivity and dimensional stability. In this contribution, novel quaternary phosphonium polymer microsphere (QPPMS) with crosslinked structure and dense carrier sites is synthesized via precipitation polymerization method, followed by incorporating into chitosan (CS) to prepare composite membrane. Compared with CS, the incorporation of QPPMS endows composite membrane more than two times increased ion exchange capacity (IEC) from 0.39 to 1.2 mmol g−1, and highly enhanced water uptake from 90% to 124% with an enhancement of 37.8%. The constructed interfacial and intra‐QPPMS transfer pathways confer almost nine times augment of conductivity at 20°C under 98% relative humidity (RH). Most importantly, the increase of area swelling is limited to 25.0% (from 32% to 40%) due to the crosslinked structure of QPPMS, which is inconceivable for homogeneous membranes and inorganic filler‐based composite membranes. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46715.

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Bent-twisted block copolymer anion exchange membrane with improved conductivity

Cited by 66 publications

References 68 publications

Block Copolymer Membranes

Block Copolymer Membranes

Highly conductive anion exchange membranes based on polymer networks containing imidazolium functionalised side chains

Simultaneously enhanced conductivity and dimensional stability of AAEM by crosslinked polymer microsphere with dense carrier sites

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