A comparative study of anion-exchange membranes tethered with different hetero-cycloaliphatic quaternary ammonium hydroxides

Dang, Hai-Son; Jannasch, Patric

doi:10.1039/c7ta06029g

Cited by 158 publications

(127 citation statements)

References 48 publications

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“…Multiple publications on PPO-based AEMs have calculated IEC values from 1 H NMR spectra that are within 10% of the values determined via a titration method, another common technique for IEC determination. 45,[48][49][50] Membranes were fabricated by dissolving ImPPO-χ (0.3 g) in NMP (~5.5. g) at room temperature.…”

Section: Membrane Preparationmentioning

confidence: 99%

Transport of Neutral and Charged Solutes in Imidazolium-Functionalized Poly(phenylene oxide) Membranes for Artificial Photosynthesis

Dischinger

Gupta

Carter

et al. 2019

Ind. Eng. Chem. Res.

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Anion exchange membranes (AEMs) play an essential role in artificial photosynthesis devices, which photoelectrochemically convert CO2 and water into useful products. AEMs allow the transport of charge carriers between electrodes while minimizing the transport of CO2 reduction products (e.g., ethanol). Fundamental transport studies in AEMs relevant to artificial photosynthesis are uncommon. Herein, we describe the preparation of an imidazoliumfunctionalized poly(phenylene oxide) membrane. Membrane transport properties were controlled by systematic variation of the degree of imidazolium functionalization, which induced changes in the membrane water volume fraction. Ethanol permeability and ionic conductivity increased with membrane water volume fraction. Consequently, membranes of relatively high ionic conductivity exhibited relatively high ethanol permeability, presenting a tradeoff in the transport properties desirable for artificial photosynthesis applications. This work seeks to enable optimization of AEMs for artificial photosynthesis through systematic study of membrane structure (water volume fraction) and its relevance to alcohol transport and electrolyte ion conductivity.

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Section: Membrane Preparationmentioning

confidence: 99%

Transport of Neutral and Charged Solutes in Imidazolium-Functionalized Poly(phenylene oxide) Membranes for Artificial Photosynthesis

Dischinger

Gupta

Carter

et al. 2019

Ind. Eng. Chem. Res.

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“…Anion conductive polymers are used to compliment cation conductive polymer in dialysis or they can be used by themselves giving specific advantages . High ionic conductivity and chemical stability are universal goals which can be improved through phase segregation from a block copolymer structure . Block copolymers form efficient ion channels which confines the mobile hydroxide ion to ion conductive phase leading to better chemical stability, compared to random copolymers.…”

Section: Introductionmentioning

confidence: 99%

“…1,2 High ionic conductivity and chemical stability are universal goals which can be improved through phase segregation from a block copolymer structure. [3][4][5][6][7] Block copolymers form efficient ion channels which confines the mobile hydroxide ion to ion conductive phase leading to better chemical stability, compared to random copolymers. Long alkyl side chains can improve the chemical stability of the tethered cation headgroup by facilitating ion channel formation.…”

mentioning

confidence: 99%

Anion conducting multiblock copolymers with different tethered cations

Kohl

2018

J. Polym. Sci. Part A: Polym. Chem.

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A multiblock copoly(arylene ether) polymer was used to quantitatively compare the ion conducting channels formed by three different, tethered cation head‐groups. The synthesis allowed for the formation of an exact number of tethers on each repeat unit. Three head‐groups, quaternary trimethylammonium (TMA), quinuclidium (ABCO), and tris(2,4,6‐trimethoxyphenyl)phosphonium (TTMPP) cation head‐groups were compared in terms of size of the conducting channels, ionic conductivity of the mobile hydroxide ion, mechanical properties, quantity of productive and unproductive water, and chemical stability of the membrane in base. The interdomain spacing showed that multiblock copolymers with larger cations formed larger ion conduction channels in the membrane. Larger cations resulted lower ion exchange capacity (IEC) even though the polymer backbone and tether arrangements were identical. TMA was the most stable cation after exposure to 1 M NaOH at 60 °C for 20 days. ABCO had a lower number of bound water molecules and a 22% loss in ion conductivity after treatment in 1 M NaOH at 60 °C for 20 days due to the higher hydroxide ion concentration in the ion conductive blocks. Membranes with TMA head‐groups also had the best mechanical properties. Two membrane preparation methods were compared. The presence of the cation head‐groups assists in phase segregation. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 1395–1403

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“…The excellent alkaline stability of spirocyclic QA cation was also confirmed by theoretical calculations . Based on their determination of alkaline stability of the small molecules, the aromatic polymers with pendent spirocyclic QA and piperidinium cations have been synthesized and used to prepare AEMs . Hickner's work indicated that the backbone of AEMs have effect on the alkaline stability of cations, and the AEM has aromatic backbone with ether groups is not stable in alkaline condition.…”

Section: Introductionmentioning

confidence: 86%

“…[34] Based on their determination of alkaline stability of the small molecules, the aromatic polymers with pendent spirocyclic QA and piperidi-nium cations have been synthesized and used to prepare AEMs. [34][35][36][37][38][39][40][41][42][43] Hickner's work indicated that the backbone of AEMs have effect on the alkaline stability of cations, [44] and the AEM has aromatic backbone with ether groups is not stable in alkaline condition. To date, there is few work on spirocyclic QAbased AEMs with an aliphatic backbone, and to understand the properties of this type of AEMs, a systematic study is needed.…”

Section: Introductionmentioning

confidence: 99%

Cross‐Linked Spirocyclic Quaternary Ammonium‐Based Anion Exchange Membrane with Tunable Properties for Fuel Cell Applications

Chu

Zhang

et al. 2019

ChemistrySelect

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The alkaline stability of anion exchange membranes (AEMs) is crucial to the performance of alkaline anion exchange membrane fuel cells (AEMFCs). Here, we have prepared and characterization of a series of new spirocyclic quaternary ammonium‐based AEMs with good alkaline stability. The AEMs was obtained by UV‐initiated polymerization of N, N‐diallylpiperidinium bromide ([DAPip][Br]), styrene and acrylonitrile. The water uptake, swelling ratio, IEC and conductivity of the AEMs increase with increasing the [DAPip][Br] content. The transparent and mechanically robust AEMs show high conductivities (7.99×10−2 S cm−1 at 80 °C) and good alkaline stability in 1 M KOH solution at 80 °C. The single cell with [DAPip][OH]20 showed a maximum power density of 93.9 mW cm−2. The spirocyclic quaternary ammonium‐based AEMs with an aliphatic backbone will open up new prospects for the preparation of AEMs with excellent alkaline stability and high conductivity.

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A comparative study of anion-exchange membranes tethered with different hetero-cycloaliphatic quaternary ammonium hydroxides

Abstract: Quaternary ammonium (QA) cations with high alkaline stability are crucial for the long term performance of anion-exchange membrane (AEM) fuel cells.

Cited by 158 publications

References 48 publications

Transport of Neutral and Charged Solutes in Imidazolium-Functionalized Poly(phenylene oxide) Membranes for Artificial Photosynthesis

Transport of Neutral and Charged Solutes in Imidazolium-Functionalized Poly(phenylene oxide) Membranes for Artificial Photosynthesis

Anion conducting multiblock copolymers with different tethered cations

Cross‐Linked Spirocyclic Quaternary Ammonium‐Based Anion Exchange Membrane with Tunable Properties for Fuel Cell Applications

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