Novel self-cross-linked multi-imidazolium cations long flexible side chains triblock copolymer anion exchange membrane based on ROMP-type polybenzonorbornadiene

Cheng, Changwen; He, Xiaohui; Huang, Shengmei; Zhang, Feng; Guo, Yan; Wen, Yufei; Wu, Bin; Chen, Defu

doi:10.1016/j.ijhydene.2020.04.276

Cited by 40 publications

(13 citation statements)

References 79 publications

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“…Earlier, radiation grafted AEMs having 2,3-dimethylimidazolium head-groups prepared by a simplified method demonstrated insufficient chemical stability in 1 M KOH at 60 °C 47 . Thus, it is highly interesting to further improve the conductivity and alkaline stability of radiation grafted AEM taking into consideration that such parameters are highly affected not only by well-defined morphology of the membrane and chemical structures but also by the alkaline media [37][38][39][40]48 .…”

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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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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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“…As shown in Figure B, the disappearance of the signal at 1567 cm –1 from the cyclic CC of norbornene groups indicates the complete reaction of norbornene groups . Meanwhile, the new bands at 1658 and 1679 cm –1 can be attributed to the noncyclic CC stretching vibration absorption formed by the ROMP of norbornene groups, further demonstrating the success of ROMP . As illustrated in Scheme , the resulting membranes display similar membrane structure and cross-link density owing to the living nature of ROMP.…”

Section: Resultsmentioning

confidence: 79%

“…56 Meanwhile, the new bands at 1658 and 1679 cm −1 can be attributed to the noncyclic C�C stretching vibration absorption formed by the ROMP of norbornene groups, further demonstrating the success of ROMP. 57 As illustrated in Scheme 1, the resulting membranes display similar membrane structure and cross-link density owing to the living nature of ROMP. More importantly, the number of ionizable groups or the ionic concentration can be tuned precisely.…”

Section: Design and Synthesis Ofmentioning

confidence: 97%

Role of Ionic Concentration and Distribution in Anionic Conductivity: Case Study on a Series of Cobaltocenium-Containing Anion Exchange Membranes with Precise Structure Control

Yang

Yan

et al. 2022

Macromolecules

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Three new anion exchange membranes (AEMs) (P1, P2, P3) with varied numbers (1, 2, 3) of cobaltocenium substituents were synthesized by ring-opening metathesis polymerization (ROMP). The living polymerization characteristic of ROMP endows the resulting AEMs with tunable ionic concentration and precise structure control, which provide an ideal model to investigate the influence of ionic concentration and substituent on the ion-conducting property of AEMs. According to Mohr titration and the alternating-current impedance method, the as-prepared AEMs demonstrated an obvious ionic concentration and substituent influence on ionic conductivity in an ordering of P2 > P3 > P1. In addition, the hydrophilic/hydrophobic microphase separation structures of the three AEMs were observed by atomic force microscopy (AFM), transmission electron microscopy (TEM), and small-angle X-ray scattering (SAXS). To further verify the relationship between ionic concentration, substituent, and ionic conductivity, molecular simulation was also used to calculate the ionic diffusivity of the three AEMs, and the result of simulation computation was consistent with the experimental result. Moreover, a tentative anion exchange membrane fuel cell (AEMFC) performance test also indicates the corresponding sequence of P2 > P3 > P1. The current work may provide an effective method for the rational design and preparation of AEMs, as well as guidance in investigating the structure−property relationship.

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“…80 Also, the length of alkyl spacer (on the side chain) may inuence ion conductivity and alkaline stability of the AEM. 81 It has been reported that graing multiple cations on the polymer backbone can form hydrophilic/hydrophobic micro-phase separation and decrease the functional degree of the copolymer, which can restrain the degradation of the polymer backbone. 82 Studies of the relationship between the degree of functionalization and the structure of the side chain (in terms of charge number and charge arrangement) have been performed, notably on PPObased AEMs with different kinds of quaternary ammonium side chains (triple, double and single-cation per cation side chain) and have found that multiple cation AEMs exhibited a higher ionic conductivity and lower water uptake due to the phase separation of the hydrophobic domains at low degree of functionalization and larger ionic clusters induced by the presence of the side chains.…”

Section: Anion Exchange Membranes (Aems)mentioning

confidence: 99%

Alkaline membrane fuel cells: anion exchange membranes and fuels

Hren

Božič²,

Fakin

et al. 2021

Sustainable Energy Fuels

209

103

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Novel self-cross-linked multi-imidazolium cations long flexible side chains triblock copolymer anion exchange membrane based on ROMP-type polybenzonorbornadiene

Cited by 40 publications

References 79 publications

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

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

Role of Ionic Concentration and Distribution in Anionic Conductivity: Case Study on a Series of Cobaltocenium-Containing Anion Exchange Membranes with Precise Structure Control

Alkaline membrane fuel cells: anion exchange membranes and fuels

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