Flexible Bis-piperidinium Side Chains Construct Highly Conductive and Robust Anion-Exchange Membranes

Zhang, Jianjun; Yu, Weisheng; Liang, Xian; Zhang, Kaiyu; Wang, Huijuan; Ge, Xiaolin; Wei, Chengpeng; Song, Wanjie; Ge, Zijuan; Wu, Liang; Xu, Tongwen

doi:10.1021/acsaem.1c01783

Cited by 48 publications

(35 citation statements)

References 69 publications

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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%

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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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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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“…More hydrophilic ethylene glycol-based side chains are also added to achieve a more flexible spacer structure and induce microphase separation [ 28 ]. As a result, a membrane with piperidinium/ pyrrolidinium functionality and flexible ethylene oxide spacers has good conductivity and stability [ 29 , 30 , 31 , 32 ]. Different functional groups (piperidinium/pyrrolidinium) and architectures of the side chain, such as the pre-functionalized end of the spacer, are discussed in detail.…”

Section: Introductionmentioning

confidence: 99%

Novel Pyrrolidinium-Functionalized Styrene-b-ethylene-b-butylene-b-styrene Copolymer Based Anion Exchange Membrane with Flexible Spacers for Water Electrolysis

Delgado

Atanasov

et al. 2023

Membranes

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Anion exchange membranes (AEM) are core components for alkaline electrochemical energy technologies, such as water electrolysis and fuel cells. They are regarded as promising alternatives for proton exchange membranes (PEM) due to the possibility of using platinum group metal (PGM)-free electrocatalysts. However, their chemical stability and conductivity are still of great concern, which is appearing to be a major challenge for developing AEM-based energy systems. Herein, we highlight an AEM with styrene-b-ethylene-b-butylene-b-styrene copolymer (SEBS) as a backbone and pyrrolidinium or piperidinium functional groups tethered on flexible ethylene oxide spacer side-chains (SEBS-Py2O6). This membrane reached 27.8 mS cm−1 hydroxide ion conductivity at room temperature, which is higher compared to previously obtained piperidinium-functionalized SEBS reaching up to 10.09 mS cm−1. The SEBS-Py206 combined with PGM-free electrodes in an AWE water electrolysis (AEMWE) cell achieves 520 mA cm−2 at 2 V in 0.1 M KOH and 171 mA cm−2 in ultra-pure water (UPW). This high performance indicates that SEBS-Py2O6 membranes are suitable for application in water electrolysis.

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“…Recently, Lee reported a series of poly(alkyl-terphenyl piperidinium)-based AEMs, and the AEMFCs showed a maximum power density of 2.58 W cm –2 . However, it is a complex procedure for the fabrication of AEMFCs because there are many parameters, such as the gas pressure, catalyst, as well as the work temperature, that have an effect on the performance of AEMFCs. − Therefore, the preparation techniques for AEMs and AEMFCs need to be further improved, which we plan to do in our future work.…”

Section: Resultsmentioning

confidence: 99%

Polyfluorene/Poly(vinylbenzyl chloride) Cross-Linked Anion-Exchange Membranes with Multiple Cations for Fuel Cell Applications

Chen

et al. 2022

ACS Appl. Energy Mater.

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An ideal anion-exchange membrane (AEM) must possess good dimensional stability, excellent alkaline stability, and good ionic conductivity. In this study, polyfluorene/poly-(vinylbenzyl chloride) (PVBC) cross-linked AEMs with multiple cations are prepared. A cross-linked structure is introduced to enhance the mechanical strength (>30 MPa) and dimensional stability (swelling ratio < 15%) of these AEMs. All PHF x TP 100−x − PVBC-and PMF x TP 100−x −PVBC-based AEMs exhibit excellent alkaline stability after treating with 2 M KOH at 80 °C for 30 days, which is attributed to the ether-free backbone and cross-linked structure. The long hydrophobic alkyl side chains of PHF 10 TP 90 − PVBC favors the construction of microphase separation within the membrane, leading to higher conductivity and cell performance (64.56 mS cm −1 and 323 mW cm −2 , at 80 °C) than those of the PMF 10 TP 90 −PVBC (57.56 mS cm −1 and 100 mW cm −2 at 80 °C).The results indicate that polyfluorene/PVBC cross-linked AEMs with multiple cations are prospective membrane materials for fuel cells.

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Flexible Bis-piperidinium Side Chains Construct Highly Conductive and Robust Anion-Exchange Membranes

Cited by 48 publications

References 69 publications

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

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

Novel Pyrrolidinium-Functionalized Styrene-b-ethylene-b-butylene-b-styrene Copolymer Based Anion Exchange Membrane with Flexible Spacers for Water Electrolysis

Polyfluorene/Poly(vinylbenzyl chloride) Cross-Linked Anion-Exchange Membranes with Multiple Cations for Fuel Cell Applications

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