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000884247 1001_ $$00000-0001-5100-9230$$aZhao, Yue$$b0$$eCorresponding author
000884247 245__ $$aA long side chain imidazolium-based graft-type anion-exchange membrane: novel electrolyte and alkaline-durable properties and structural elucidation using SANS contrast variation
000884247 260__ $$aLondon$$bRoyal Soc. of Chemistry$$c2020
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000884247 520__ $$aNewly designed styrylimidazolium-based grafted anion-exchange membranes (StIm-AEMs), in which imidazolium ionic groups are attached to styrene at the far side from the graft chains, were prepared by radiation-induced graft polymerization of p-(2-imidazoliumyl) styrene onto poly(ethylene-co-tetrafluoloethylene) (ETFE) films, followed by N-alkylation and ion-exchange reactions. StIm-AEM having an ion exchange capacity (IEC) of 0.54 mmol g−1 with a grafting degree (GD) of ∼18%, possesses practical conductivity (>50 mS cm−1) even with a very low water uptake (∼10%) and high stability over 600 h in a 1 M KOH solution at 80 °C. There exists a critical IEC (IECc) in the range of 0.7–0.8 mmol g−1 over which the membrane showed high water uptake, which resulted in pronounced susceptibility to hydrolysis. Using small-angle neutron scattering technique with a contrast variation method, we found the hydrophilic phase in StIm-AEMs with IECs lower and higher than IECc shows “reverse-micelles” with water domains dispersed in the polymer matrix and “micelles” with graft polymer aggregates dispersed in the water matrix, respectively. The further analysis of micelle structures using the hard-sphere liquid model and Porod limit analysis reveals that the interfacial structures of ionic groups are essential for the electrochemical properties and durability of StIm-AEMs. In addition, StIm-AEM with an IEC of 0.95 mmol g−1 and the maximum power density of 80 mW cm−2 in the hydrazine hydrate fuel cell test, exhibited long-term durability under constant current (8.0 mA) up to 455 h, which, thus far, is the best durability at 80 °C for platinum-free alkaline-type liquid fuel cells.
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000884247 7001_ $$0P:(DE-HGF)0$$aYoshimura, Kimio$$b1
000884247 7001_ $$00000-0003-2108-0612$$aMahmoud, Ahmed Mohamed Ahmed$$b2
000884247 7001_ $$0P:(DE-HGF)0$$aYu, Hwan-Chul$$b3
000884247 7001_ $$0P:(DE-HGF)0$$aOkushima, Shun$$b4
000884247 7001_ $$0P:(DE-HGF)0$$aHiroki, Akihiro$$b5
000884247 7001_ $$0P:(DE-HGF)0$$aKishiyama, Yoshihiro$$b6
000884247 7001_ $$0P:(DE-HGF)0$$aShishitani, Hideyuki$$b7
000884247 7001_ $$0P:(DE-HGF)0$$aYamaguchi, Susumu$$b8
000884247 7001_ $$0P:(DE-HGF)0$$aTanaka, Hirohisa$$b9
000884247 7001_ $$0P:(DE-HGF)0$$aNoda, Yohei$$b10
000884247 7001_ $$0P:(DE-HGF)0$$aKoizumi, Satoshi$$b11
000884247 7001_ $$0P:(DE-Juel1)130905$$aRadulescu, Aurel$$b12
000884247 7001_ $$0P:(DE-HGF)0$$aMaekawa, Yasunari$$b13$$eCorresponding author
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000884247 8564_ $$uhttps://juser.fz-juelich.de/record/884247/files/SM-ART-05-2020-000947.R1_Proof_hi-accepted.pdf$$yPublished on 2020-07-29. Available in OpenAccess from 2021-07-29.
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