Poly(vinyl alcohol)-Based Hydrogel Anion Exchange Membranes for Alkaline Fuel Cell

Yuan, Caili; Li, Pan; Zeng, Lingping; Duan, Hanzhao; Wang, Jianchuan; Wei, Zidong

doi:10.1021/acs.macromol.1c00598

Cited by 35 publications

(32 citation statements)

References 60 publications

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“…The λ of QPDI-70, QPDI-85, and QPDI-100 at 80 °C is 17.29, 17.33, and 18.54, respectively, which helps the hydrated membrane diffuse hydroxide ions more effectively. Moreover, Figure c shows that at the same conductivity level, QPDI-a had a lower SR, which further indicates that the high rigid skeleton of the polymer limits the volume change of the polymer under the action of hydration, thus contributing to the swelling inhibition of the polymer. ,,,− ,− …”

Section: Resultsmentioning

confidence: 95%

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: 95%

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

et al. 2022

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“…The synthesis of N 1 ,N 6 -bis(6bromohexyl)-N 1 ,N 1 ,N 6 ,N 6 -tetramethylhexane-1,6-diaminium bromide (BQB) was conducted based on the reported procedures in the literature (Scheme S1). 46 2.3. Synthesis of BTB-x% and TB.…”

Section: Synthesis Of the Bqbmentioning

confidence: 99%

Tröger’s Base Microporous Anion Exchange Membranes with Hyperbranched Structure for Fuel Cells

Chen

Choo

Gao

et al. 2022

ACS Appl. Energy Mater.

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The application of anion exchange membranes (AEMs) in alkaline fuel cells is profoundly affected by its performance. In this work, Tröger’s base microporous AEMs with hyperbranched structure (QA-BTB-x%) are prepared by superacid catalysis. The introduction of the hyperbranched structure can enhance the free volume of the AEMs, which will improve the water uptake (WU) of the AEMs and thus promote the transport of OH–. By increasing the content of the branching agent from 0% to 8%, the WU of the AEMs gradually increased from 41.7% to 62.6% at 80 °C. The maximum OH– conductivity of the QA-BTB-5% AEMs can reach to 95.2 mS cm–1 in ultrapure water at 80 °C with a low swelling ratio (14.9% at 80 °C). Small angle X-ray scattering (SAXS), atomic force microscopy (AFM) and transmission electron microscopy (TEM) show that the QA-BTB-5% AEMs has a good microphase separation structure that is beneficial for OH– transport. After a long-term alkaline stability test, the QA-BTB-5% still has a high OH– conductivity. The maximum power density of the QA-BTB-5%-based single cell can reach to 548 mW cm–2 in H2/O2. All of the results demonstrate obvious performance enhancements of AEMs upon the introduction of hyperbranched structure into the polymer backbone.

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“…However, low ionic conductivity and poor stability, especially poor chemical stability, have always been the major problems that lie in the way of AEM development. To address the above problems, several strategies have been proposed, including the design of stable cation exchange groups, − alkaline-resistant polymer backbone (e.g., without the benzyl- ether group), − microphase separation, − semi-interpenetrating polymer network (IPN)/IPN structure, cross-linking, − blending, − and hybridization. − Encouraging results have been achieved, for instance, a cross-linked poly(norbornene) PTFE-supported membrane showed a high conductivity of 198 mS cm –1 @80 °C, with no significant decay after 1000 h under 1 mol L –1 KOH at 80 °C . The poly(aryl piperidinium) membrane was prepared by inducing the strong basic piperidinium cationic group onto the rigid hydrophobic aryl backbone without the ether bond, which showed conductivity of 170 mS cm –1 @80 °C and durability of over 2000 h …”

Section: Introductionmentioning

confidence: 99%

Dual-Cation Interpenetrating Polymer Network Anion Exchange Membrane for Fuel Cells and Water Electrolyzers

Zeng

et al. 2022

Macromolecules

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Anion exchange membranes (AEMs) play an important role in many electrochemical devices, such as alkaline AEM fuel cells and water electrolyzers, with the inherent anion transportation functionality. High ionic conductivity and excellent mechanical and chemical stability are indispensable for the development of AEMs. In addition, excellent comprehensive properties such as high mechanical strength and high ionic conductivity acquired simultaneously are quite important for their commercialization. Single-cation interpenetrating polymer network (IPN) AEMs, with their mechanical support phase and ion conduction phase interlaced, have been reported in our previous work and showed the potential for addressing the dilemma of conductivity and strength. To further increase the ion exchange capacity, both the polymer networks are ionized to fabricate a kind of dual-cation IPN membrane in this work. The resultant membrane cPVBMP-3.0 cQPPO shows excellent OH − conductivity (160.5 mS cm −1 at 80 °C) and good mechanical strength (>20 MPa). In a H 2 /air (CO 2 -free) single cell, a high peak power density of 576 mW cm −2 is achieved. In addition, a current density of 210 mA cm −2 at 1.80 V is observed in pure water electrolysis with a membrane electrode assembly electrolyzer.

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Poly(vinyl alcohol)-Based Hydrogel Anion Exchange Membranes for Alkaline Fuel Cell

Cited by 35 publications

References 60 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

Tröger’s Base Microporous Anion Exchange Membranes with Hyperbranched Structure for Fuel Cells

Dual-Cation Interpenetrating Polymer Network Anion Exchange Membrane for Fuel Cells and Water Electrolyzers

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