Ultrathin anion exchange membranes with an improved OH<sup>−</sup> transfer rate for high-performance AEMFCs

Xu, Tongwen; Song, Wanjie; Liang, Xian; Zhang, Huaqing; Liu, Xiang; Zhang, Xin; Wu, Liang; Ge, Xiaolin

doi:10.1039/d2ta05681j

Cited by 30 publications

(22 citation statements)

References 49 publications

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“…The conductivity of QABP-2 membrane (hydrophobicity ether-free backbone) displayed ∼1.24 times higher than that of BQAPPO (less hydrophobicity ether backbone) under the same IEC value and side chains. 90 These results further explain why the conductivity of aryl-ether-free alkaline membranes is generally higher than aryl-ether-containing alkaline membranes. Membrane stability is jointly affected by the skeleton, anion groups, and linkers.…”

Section: Relationship Between the Polymer Backbone And Membranementioning

confidence: 78%

Section: Types Of Alkaline Membranesmentioning

confidence: 99%

“…(a) General scheme of acid-catalyzed Friedel–Crafts polycondensations and representative chemical structure. − ,, (b) Chemical structure of poly(carbazole) membrane and related H 2 /O 2 fuel cell and water electrolytic performance. (c) Chemical structure of QABP-2 and related fuel cell performance. Reproduced with permission from refs and .…”

Section: Types Of Alkaline Membranesmentioning

confidence: 99%

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Alkaline Membranes toward Electrochemical Energy Devices: Recent Development and Future Perspectives

et al. 2023

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Anion-exchange membranes (AEMs) that can selectively transport OH–, namely, alkaline membranes, are becoming increasingly crucial in a variety of electrochemical energy devices. Understanding the membrane design approaches can help to break through the constraints of undesired performance and lab-scale production. In this Outlook, the research progress of alkaline membranes in terms of backbone structures, synthesis methods, and related applications is organized and discussed. The evaluation of synthesis methods and description of membrane stability enhancement strategies provide valuable insights for structural design. Finally, to accelerate the deployment of relevant technologies in alkaline media, the future priority of alkaline membranes that needs to be addressed is presented from the perspective of science and engineering.

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Section: Relationship Between the Polymer Backbone And Membranementioning

confidence: 78%

Section: Types Of Alkaline Membranesmentioning

confidence: 99%

Section: Types Of Alkaline Membranesmentioning

confidence: 99%

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Alkaline Membranes toward Electrochemical Energy Devices: Recent Development and Future Perspectives

et al. 2023

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“…It should be noted that it has a low SR between 20 and 80 °C, which is lower than most of the state-of-art AEMs (Figure 3d, Figure S7, Supporting Information). [8,13,14,[20][21][22][23][24][25][26] The AEM is robust with a tensile strength of 41.5 MPa and an elongation at break of 50% at dry state (in I − form, Figure 4a, PPTQ-I). The AFM phase image show homogeneous microphase separation, in which ionic channels (dark regions) are useful for anion transportation (in I − form, Figure 4b).…”

Section: Resultsmentioning

confidence: 99%

N‐Methylquinuclidinium‐Based Anion Exchange Membrane with Ultrahigh Alkaline Stability

Zeng

Wen

et al. 2023

Advanced Materials

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Anion exchange membrane (AEM) water electrolysis is a promising technology for hydrogen production from renewable energy sources. However, the bottle‐neck of its development is the poor comprehensive performance of AEM, especially the stability at high concentrated alkaline condition and temperature. Herein, we propose a new cationic group N‐methylquinuclidinium with enhanced alkaline stability and hereby a full‐carbon chain poly(aryl quinuclidinium) AEM was prepared. Compared with reported AEMs, it shows ultra‐high comprehensive alkaline stability (no chemical decomposition, no decay of conductivity) in 10 M NaOH aqueous solution at 80°C for more than 1800 h, excellent dimensional stability (swelling ratio: < 10% in pure water, < 2% in 10 M NaOH) in OH− form at 80°C, high OH− conductivity (∼139.1 mS/cm at 80°C) and high mechanical properties (tensile strength: 41.5 MPa, elongation at break: 50%). The water electrolyser using our AEM exhibits a high current density (1.94 A/cm2 at 2.0 V) when assembled with nickel‐alloy foam electrodes, and high durability when assembled with nickel foam electrodes.This article is protected by copyright. All rights reserved

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“…Membrane thickness of 10 μm can be achieved with tensile strength of 45.7 MPa in recent research. [126] In the operating environment, the AEMs are exposed to moisture and mechanical stress, whereas, excessive water absorption has impact on its mechanical characteristics as mentioned in the section of ion exchange capacity. Lots of initiatives have been made to address this issue.…”

Section: Mechanical Stabilitymentioning

confidence: 99%

Challenges and Strategies of Anion Exchange Membranes in Hydrogen‐electricity Energy Conversion Devices

Liu

et al. 2023

Chemistry A European J

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Alkaline hydrogen-electricity energy conversion technologies, involving anion exchange membrane fuel cells (AEMFCs) and anion exchange membrane water electrolyzers (AEMWEs) are more appealing than the acidic counterparts due to the elimination of precious metal catalysts. However, the physicochemical properties of anion exchange membrane (AEMs), i.e., ionic conductivity, mechanical strength, stability, etc., are inferior to that of proton exchange membranes (PEMs), thus hindering these alkaline technologies from practical employment. To promote their development, we summarize the main challenges and the corresponding strategies of AEMs for the application of AEMFCs and AEMWEs in this review. The hydroxide transportation mecha-nism, ion exchange capacity, hydration and microscopic morphology that are relevant to the ionic conductivity are discussed firstly. Following the ionic conductivity, another obstacle, stability of AEMs is comprehensively described in terms of alkaline stability, mechanical stability and electrochemical stability. Upon integrating into the devices, water management, carbonation effect and membrane-electrode interface that are critical to the cell performance are highlighted as well. This review is anticipated to provide insights into the AEM design for hydrogen-electric energy conversion devices, thus accelerating the widespread commercialization of these promising technologies.

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Ultrathin anion exchange membranes with an improved OH⁻ transfer rate for high-performance AEMFCs

Abstract: Anion exchange membranes (AEMs) as the key component of alkaline anion exchange membrane fuel cells (AEMFCs) are closely related to its performance. Reducing membrane thickness as much as possible on...

Cited by 30 publications

References 49 publications

Alkaline Membranes toward Electrochemical Energy Devices: Recent Development and Future Perspectives

Alkaline Membranes toward Electrochemical Energy Devices: Recent Development and Future Perspectives

N‐Methylquinuclidinium‐Based Anion Exchange Membrane with Ultrahigh Alkaline Stability

Challenges and Strategies of Anion Exchange Membranes in Hydrogen‐electricity Energy Conversion Devices

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Ultrathin anion exchange membranes with an improved OH− transfer rate for high-performance AEMFCs

Abstract: Anion exchange membranes (AEMs) as the key component of alkaline anion exchange membrane fuel cells (AEMFCs) are closely related to its performance. Reducing membrane thickness as much as possible on...

Cited by 30 publications

References 49 publications

Alkaline Membranes toward Electrochemical Energy Devices: Recent Development and Future Perspectives

Alkaline Membranes toward Electrochemical Energy Devices: Recent Development and Future Perspectives

N‐Methylquinuclidinium‐Based Anion Exchange Membrane with Ultrahigh Alkaline Stability

Challenges and Strategies of Anion Exchange Membranes in Hydrogen‐electricity Energy Conversion Devices

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Ultrathin anion exchange membranes with an improved OH⁻ transfer rate for high-performance AEMFCs