Densely quaternized anion exchange membranes synthesized from Ullmann coupling extension of ionic segments for vanadium redox flow batteries

Yu, Chengtao; Lin, Qilang; Zheng, Yuying; Yu, Yan; Chen, Dongyang

doi:10.1007/s40843-018-9299-y

Cited by 21 publications

(10 citation statements)

References 49 publications

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“…Recently, anion exchange membranes (AEMs) based on quaternary ammonium (QA)-grafted polymers (including polysulfone [19][20][21], poly(arylene ether sulfone) [22][23][24][25], poly(arylene ether ketone) [26,27], cardo-polyetherketone [28], poly(fluorenyl ether) (PFE) [29][30][31] and poly(arylene ether benzonitrile) [32]) and imidazolium-functionalized polymers (such as poly(vinylimidazole) [33,34], poly(phenylene oxide) [35][36][37] and poly(arylene ether ketone) [38]) have been adopted for VRFB applications. Like sulfonated poly(arylene ether)-type membranes, most AEMs are derived from hydrocarbon-based backbones, which are relatively cheap compared with Nafion.…”

Section: Introductionmentioning

confidence: 99%

Anion exchange membranes based on long side-chain quaternary ammonium-functionalized poly(arylene piperidinium)s for vanadium redox flow batteries

et al. 2021

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Section: Introductionmentioning

confidence: 99%

Anion exchange membranes based on long side-chain quaternary ammonium-functionalized poly(arylene piperidinium)s for vanadium redox flow batteries

et al. 2021

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“…Different from PEMs, due to the Donnan effect between cationic groups and vanadium ions, AEMs usually have better vanadium resistance, which makes it possible to further improve the coulomb efficiency and capacity attenuation of VRFB. Chen et al 27 prepared a series of quaternary ammonium-functionalized AEMs based on fluorinated poly(aryl ether ketone)s (QA-OMPFEKs). The representative QA-OMPFEK-20 (1.66 mmol g −1 ) has good ion selectivity, and the coulomb efficiency of the single battery assembled by it reaches 94.0% at a current density of 40 mA cm −2 , which is much higher that of Nafion 212 (88.4%).…”

Section: ■ Introductionmentioning

confidence: 99%

Efficiency and Oxidation Performance of Densely Flexible Side-Chain Piperidinium-Functionalized Anion Exchange Membranes for Vanadium Redox Flow Batteries

Tao

Wang

Cai

et al. 2021

ACS Appl. Energy Mater.

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In order to improve the performance of vanadium redox flow batteries (VRFBs), a series of anion exchange membranes (PAES-8mPip-x) containing multiple flexible side-chain piperidinium structures were selected for use as ionic membranes for VRFBs. The relationship between their battery performance and chemical structure was systematically investigated, and their oxidation stability and degradation mechanism in strong oxidizing solution were studied in detail. These membranes exhibited high SO4 2– conductivity as well as low area specific resistance due to the incorporation of densely flexible side-chain piperidinium. Their SO4 2– conductivity and area-specific resistance are in the range of 9.6–18.1 mS cm–1 and 0.19–0.34 Ω cm2 at 20 °C, respectively. The single battery assembled with the representative PAES-8mPip-0.25 displayed high efficiencies, and its coulombic efficiency, voltage efficiency, and energy efficiency were 94.78, 90.15, and 85.44% at a current density of 60 mA cm–2, respectively, which were higher than those of Nafion 212 (94.19, 89.08, and 83.90%) at the same testing condition. What is more, it was found that these AEMs had good stability in strong oxidizing solution. Although their polymer backbone was degraded to a certain extent in 1.5 mol L–1 VO2 +/3 mol L–1 H2SO4 at 40 °C, the flexible piperidinium in side chains did not undergo significant chemical degradation. Related research results provide a scientific basis for the design of high-performance anion membrane materials for VRFBs.

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“…The characterization protocols and instruments are described in our previous work on the development of ionclustered AEMs [42]. .…”

Section: Physical Characterizationmentioning

confidence: 99%

Fluorinated poly(fluorenyl ether)s with linear multi-cationic side chains for vanadium redox flow batteries

Chen

Wang

et al. 2020

Sci. China Mater.

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The cationic group distribution along the polymeric backbones of anion exchange membranes (AEMs) has significant influence on their microscopic morphology and anion conductivity. To develop high-performance AEMs for vanadium redox flow batteries (VRFBs), a series of poly (fluorenyl ether) samples bearing di-and tri-quaternary ammonium side chains with similar ion exchange capacities (IECs) were synthesized by grafting cationic alkyl chains with tertiary amine-containing poly(fluorenyl ether) precursors. The experimental results indicate that the introduction of the multi-cationic side chains facilitates the formation of microphase-separated morphologies and enhances anion conductivity. Moreover, the number of spacer atoms between the quaternary ammonium groups on the side chains affects the water uptake of the membranes, thus complicating the relationship between the density of cationic group distribution and anion conductivity. The poly(fluorenyl ether)s with dicationic side chains and six spacing atoms (DQA-PFE-C6) showed the highest anion conductivity. A VRFB assembled with DQA-PFE-C6 exhibited a maximum power density of 239.80 mW cm −2 at 250 mA cm −2 , which is significantly higher than a VRFB assembled with Nafion 212. Therefore, side chain engineering is an effective chemical approach to enhance the properties of AEMs for VRFB applications.

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Densely quaternized anion exchange membranes synthesized from Ullmann coupling extension of ionic segments for vanadium redox flow batteries

Abstract: ), leading to improved Coulombic and energy efficiencies in Vanadium redox flow batteries (VRFBs). Therefore, the Ullmann coupling extension is a valuable approach for the development of high performance anion exchange membranes for VRFBs.

Cited by 21 publications

References 49 publications

Anion exchange membranes based on long side-chain quaternary ammonium-functionalized poly(arylene piperidinium)s for vanadium redox flow batteries

Anion exchange membranes based on long side-chain quaternary ammonium-functionalized poly(arylene piperidinium)s for vanadium redox flow batteries

Efficiency and Oxidation Performance of Densely Flexible Side-Chain Piperidinium-Functionalized Anion Exchange Membranes for Vanadium Redox Flow Batteries

Fluorinated poly(fluorenyl ether)s with linear multi-cationic side chains for vanadium redox flow batteries

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