Effects of the crown ether cavity on the performance of anion exchange membranes

Chen, Jia Hui; Choo, Yvonne Shuen Lann; Wang, Xi Hao; Liu, Ying Jie; Yue, Xi Bin; Gao, Xue Lang; Gao, Wei; Zhang, Qiu Gen; Zhu, Ai Mei; Liu, Qing Lin

doi:10.1016/j.jcis.2023.04.011

Cited by 23 publications

(3 citation statements)

References 64 publications

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“…According to previous work, , the preparation of catalyst ink was detailed as follows: Water, isopropanol, an ionomer solution [quaternized poly(biphenyl piperidinium) dissolved in dimethyl sulfoxide], and a Pt/C catalyst (40 wt % Pt) were mixed and dispersed ultrasonically for 30 min. Then the catalyst ink was sprayed on the surfaces of QAPCE-1,4C and QAPCE-1.4P using an ultrasonic spraying machine.…”

Section: Methodsmentioning

confidence: 99%

Modification of Hydrophobic Diacid Units for Enhanced Poly(crown ether) Anion-Exchange Membrane Performance

Chen,

Lai,

Choo

et al. 2023

ACS Appl. Energy Mater.

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Ideal anion-exchange membranes (AEMs) for anion-exchange membrane fuel cells (AEMFCs) must possess high OH − conductivity, excellent alkaline resistance, good thermal stability, and improved dimensional stability. In this study, four types of poly(crown ether) (PCE) cross-linked AEMs containing different aromatic or alicyclic dicarboxylic acids were prepared for AEMFCs. The hydrophilic/hydrophobic polarity discrimination of AEMs can be adjusted by the introduction of various diacids into the polymer backbones. As a result, an obvious microphase-separated structure will form in AEMs, which may aid the movement of hydroxide ions. The as-prepared QAPCE-1.4P membranes with 1,4-phenylenediacetic acid as the dicarboxylic acid exhibit a distinct micromorphology separation, as confirmed by morphology characterization using small-angle X-ray scattering, atomic force microscopy, as well as transmission electron microscopy. The highest hydroxide ion conductivity of QAPCE-1.4P at 80 °C in ultrapure water is 133.25 mS cm −1 . Meanwhile, QAPCE-1.4P shows an improved dimensional stability at 80 °C with a swelling ratio of 10.83%. In addition, QAPCE-1.4P shows good chemical stability (96.1% ionic conductivity retention) even after being put in harsh alkali conditions at 80 °C for 40 days. Furthermore, the maximum power density of a single cell using QAPCE-1.4P as the polymer electrolyte membranes can reach 689 mW cm −2 in hydrogen/oxygen (80 °C).

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Section: Methodsmentioning

confidence: 99%

Modification of Hydrophobic Diacid Units for Enhanced Poly(crown ether) Anion-Exchange Membrane Performance

Chen,

Lai,

Choo

et al. 2023

ACS Appl. Energy Mater.

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“…Therefore, the use of ether-free bonded polymers in anion exchange membranes has received attention from researchers, such as polyolefins, 18,19 polybenzimidazoles, 20 poly(aryl piperidinium), 21–23 and crown ether polymers. 24,25 Li et al 26 reported a series of polyolefin copolymer-based AEMs at 80 °C for 20 days in 10 M NaOH solution, which exhibited excellent alkali stability; Zhu et al 27 studied the anion exchange membrane based on polybenzimidazole as the skeleton through the polycondensation reaction, which showed a high alkaline stability at 80 °C in 1 M NaOH for more than 1000 hours; Wang et al 28 fabricated AEMs containing a macrocyclic host–guest structure with dynamic self-protection. The membranes achieved a hydroxide conductivity of 114 mS cm −1 at 80 °C.…”

Section: Introductionmentioning

confidence: 99%

Synergistic functionalization of poly(p-terphenyl isatin) anion exchange membrane with quaternary ammonium and piperidine cations for fuel cells

Gu,

Zhang,

Wang

et al. 2024

Ind. Chem. Mater.

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“…The essential component of AEMFCs and AEMWE is the anion exchange membrane (AEM), which is designed for separating the cathode and anode of the battery, and it is crucial for ion transport [ 11 ]. It directly determines the performance of AEMFCs, including service life and power density [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Semi-Interpenetrating Network Anion Exchange Membranes by Thiol–Ene Coupling Reaction for Alkaline Fuel Cells and Water Electrolyzers

Jin

Zou

et al. 2023

Molecules

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In this work, a thiol–ene coupling reaction was employed to prepare the semi-interpenetrating polymer network AEMs. The obtained QP-1/2 membrane exhibits high hydroxide conductivity (162.5 mS cm−1 at 80 °C) with a relatively lower swelling ratio, demonstrating its mechanical strength of 42 MPa. This membrane is noteworthy for its improved alkaline stability, as the semi-interpenetrating network effectively limits the attack of hydroxide. Even after being treated in 2 M NaOH at 80 °C for 600 h, 82.5% of the hydroxide conductivity is maintained. The H2/O2 fuel cell with QP-1/2 membrane displays a peak power density of 521 mW cm−2. Alkaline water electrolyzers based on QP-1/2 membrane demonstrated a current density of 1460 mA cm−2 at a cell voltage of 2.00 V using NiCoFe catalysts in the anode. All the results demonstrate that a semi-interpenetrating structure is a promising way to enhance the mechanical property, ionic conductivity, and alkaline stability of AEMs for the application of alkaline fuel cells and water electrolyzers.

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Effects of the crown ether cavity on the performance of anion exchange membranes

Cited by 23 publications

References 64 publications

Modification of Hydrophobic Diacid Units for Enhanced Poly(crown ether) Anion-Exchange Membrane Performance

Modification of Hydrophobic Diacid Units for Enhanced Poly(crown ether) Anion-Exchange Membrane Performance

Synergistic functionalization of poly(p-terphenyl isatin) anion exchange membrane with quaternary ammonium and piperidine cations for fuel cells

Semi-Interpenetrating Network Anion Exchange Membranes by Thiol–Ene Coupling Reaction for Alkaline Fuel Cells and Water Electrolyzers

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