Exploring highly soluble ether-free polybenzimidazole as anion exchange membranes with long term durability

Guo, Maolian; Ban, Tao; Wang, Yajie; Zhang, Yiyang; Zhang, Jingsong; Zhu, Xiuling

doi:10.1016/j.memsci.2022.120299

Cited by 44 publications

(33 citation statements)

References 53 publications

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“…With increase in quaternary ammonium, the bright areas were gradually concentrated, and worm-like structures appeared in QPDI-100 (Figure f), showing a more apparent separation of the hydrophilic and hydrophobic phases, which may be due to the introduction of more flexible long chains of quaternary ammonium salts. The hydrophilic quaternary ammonium salt is more conducive to the formation of ionic agglomeration in the cavity formed by the rigid skeleton . The microphase separation was further confirmed by SAXS, as shown in Figure b.…”

Section: Resultsmentioning

confidence: 66%

High Conductive Anion Exchange Membranes from All-Carbon Twisted Intrinsic Microporous Polymers

et al. 2022

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This study obtained solution-tractable anion-selective membranes with intrinsic porous and highly ionic conductive capabilities by a convenient route. We used the coplanar structure of 9,9-dimethylxanthene to construct a rigid twisted intrinsic microporous all-carbon skeleton PDI with up to 363.4 m 2 g −1 of Brunauer−Emmett−Teller surface, and the pore was filled with a quaternary ammonium salt containing long flexible alkyl chains, which produced an efficient means of OH − transport. The conductivity of the resulting polymer (QPDI-100) is reached as high as 205 mS cm −1 at 80 °C. The size stability was determined to be good at high conductance and swelling ratio is less than 15% at 80 °C. QPDI-a exhibited good stability under alkaline conditions, and 90% of the conductivity of QPDI-100 was retained after being immersed in 1 M NaOH solution at 60 °C for 40 days. The power density of H 2 −O 2 fuel cells at 60 °C was 437.7 mW cm −2 . The prepared intrinsic porous anion exchange membranes (AEMs) demonstrate potential for the development of anion exchange membrane fuel cells. This membrane design strategy paves the way for a new generation of AEMs for the purposes of electrochemical energy conversion and storage.

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Section: Resultsmentioning

confidence: 66%

High Conductive Anion Exchange Membranes from All-Carbon Twisted Intrinsic Microporous Polymers

et al. 2022

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“…It can be noted that the peak power density is about 286 mW cm –2 at a current density of 400 mA cm –2 at 80 °C. As shown in Figure b, the single cell performances of the reported AEMs grafted with cations with a N -spirocyclic structure are compared, and the peak power densities for SEBS-p-ASU-TMA-40 reach the general level. ,,,,− This result indicates that the SEBS-p-ASU-TMA-40 membrane is a potential material in the application of AEMFCs. To further evaluate the in situ durability of the AEMFC, the MEA with the SEBS-p-ASU-TMA-40 anion exchange membrane is operated at a constant current of 200 mA cm –2 at 60 °C, and the result is shown in Figure c.…”

Section: Resultsmentioning

confidence: 92%

“…(a) H 2 /O 2 AEMFC performance for the SEBS-p-ASU-TMA-40 membrane at 80 °C. (b) Peak power densities for SEBS-p-ASU-TMA-40 and other AEMs reported in the literature. ,,,,− (c) AEMFC durability test based on SEBS-p-ASU-TMA-40 under a constant current density of 200 mA cm –2 at 60 °C.…”

Section: Resultsmentioning

confidence: 99%

SEBS-Based Anion Exchange Membrane Grafted with N-Spirocyclic Quaternary Ammonium Cations for Fuel Cells

Sang

Liu

Wang

et al. 2022

ACS Appl. Energy Mater.

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To balance the water absorption, alkali stability, and ion conductivity of anion exchange membranes, we synthesize high-performance anion exchange membranes (AEMs) based on 3-(3-(piperidin-4-yl)propyl)-6azaspiro[5.5]undecan-6-ium bromide (p-ASU), 3-amino-6-azaspiro[5.5]undecan-6-ium (a-ASU), and trimethylamine (TMA). By fully grafting ASU and TMA cations onto poly(styrene-b-(ethylene-co-butylene)-b-styrene) (SEBS), obvious microphase separation structures are well-developed in the anion exchange membranes. The swelling ratio of SEBS-ASU-TMA membranes is less than 39% on account of the introduction of larger sterically hindered ASU cations. In addition, the SEBS-p-ASU-TMA-40 membrane with an alkyl spacer chain exhibits a higher efficiency for ion transport channels and higher ionic conductivity compared to SEBS-a-ASU-TMA-40 without the alkyl spacer chain. The SEBS-p-ASU-TMA-40 attained a OH − conductivity of 96.6 mS cm −1 at 80 °C. Furthermore, stable N-spirocyclic quaternary ammonium cations contributed to the good chemical stability of SEBS-p-ASU-TMA-40, which exhibits 17% degradation in OH − conductivity after 1000 h of alkali stability testing. The H 2 /O 2 fuel cell assembled by SEBS-p-ASU-TMA-40 exhibits a maximum power density of 286 mW cm −2 at 80 °C.

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“…Acid-doped PBI membranes have been extensively studied in the fields of fuel cells, gas separation, pervaporation dehydration of acetic acid and OSN. 17–28,40–43 They possessed excellent properties and allowed operations at high temperatures up to 200 °C without dehydration; however, low mechanical properties at high doping levels and acid leaching at extreme temperatures might occur. Chen et al developed a cross-linked PBI membrane with the aid of an aqueous potassium persulphate (K 2 S 2 O 8 ) solution.…”

Section: The Chemistry Of Polybenzimidazoles (Pbis)mentioning

confidence: 99%

“…22–25 On the other hand, PBI and quaternized-PBI can serve as a framework in forming highly anion conducting anion exchange membranes (AEMs) with outstanding alkaline resistance. 26–28 Comparing with conventional acidic fuel cells, AEM fuel cells have the most significant advantage of the much faster kinetics of the oxygen reduction reaction under alkaline operating conditions, which allows the use of non-precious metal catalysts (Ag, Ni, Co). The resultant AEM membranes can critically dominate the OH − transport while limiting the fuel crossover.…”

Section: Introductionmentioning

confidence: 99%

Polybenzimidazoles (PBIs) and state-of-the-art PBI hollow fiber membranes for water, organic solvent and gas separations: a review

Chung

Weber²,

Chung

2022

J. Mater. Chem. A

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Exploring highly soluble ether-free polybenzimidazole as anion exchange membranes with long term durability

Cited by 44 publications

References 53 publications

High Conductive Anion Exchange Membranes from All-Carbon Twisted Intrinsic Microporous Polymers

High Conductive Anion Exchange Membranes from All-Carbon Twisted Intrinsic Microporous Polymers

SEBS-Based Anion Exchange Membrane Grafted with N-Spirocyclic Quaternary Ammonium Cations for Fuel Cells

Polybenzimidazoles (PBIs) and state-of-the-art PBI hollow fiber membranes for water, organic solvent and gas separations: a review

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