Tailoring the microphase separation structure of poly(crown ether) anion exchange membranes by introducing aliphatic chains

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

doi:10.1016/j.jpowsour.2023.233014

Cited by 8 publications

(4 citation statements)

References 62 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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“…The apparent morphology and the microscopic phase separation of the membranes are the key conditions for judging its densification as well as ion transport. 1,43,44 The overall yellowish-green color and transparency can be seen through the pictures of the membranes taken in Figure 2a. As can be seen in Figure 2b−d, the membrane is very flexible and maintains good integrity after vigorous kneading.…”

Section: Micromorphological Analysismentioning

confidence: 99%

Fluorinated Poly(thiophene-based aryl piperidinium) Anion-Exchange Membranes Containing Dual Cation–Dipole Interactions for Alkaline Fuel Cells

Li,

Gao,

et al. 2024

ACS Sustainable Chem. Eng.

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At present, in order to expand and extend the application scope of anion-exchange membrane fuel cells (AEMFCs) in response to the global development of green energy, the design and development of anion exchange membranes (AEMs) that combine high electrochemical performance and long life is a matter of great urgency. In this paper, a series of QPTPTMT-x AEMs with different contents of 2,2,2-trifluoro-1-(5-methoxythiophen-2-yl)ethan-1-one (TMTE) were prepared by first synthesizing TMTE monomers and then introducing them into the polyaryl piperidine skeleton via an ultrastrong acid-catalyzed reaction. With the introduction of TMTE monomers, the F atom provides strong hydrophobicity, while the S heteroatom is present to facilitate intermolecular interactions. On the other hand, –CF3 and O atoms interact together with cations to produce dual cation–dipole interactions. The comprehensive performance of QPTPTMT-x AEMs produces great improvement. Particularly, QPTPTMT-20 AEM with the lowest ion-exchange capacity and swelling ratio achieved the best ionic conductivity of 180.1 mS cm–1 at 80 °C while possessing a tensile strength of 72 MPa. After immersion in 3 M NaOH for 1080 h, the conductivity retention of the AEMs was still 94.4%. Last, the membranes were prepared into membrane electrode assemblies for single-cell performance testing. The QPTPTMT-20 AEM demonstrated a peak power density of 416 mW cm–2 at 80 °C.

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“…[4][5][6] Nevertheless, PEMFC advancement has not been devoid of challenges, particularly owing to the pervasive reliance on expensive platinum group metals (PGMs) as the eletrocatalysts. 5,[7][8][9][10] In this context, anion exchange membrane fuel cells (AEMFCs) have attracted considerable attention as a promising alternative to their PEMFC counterparts. The rationale behind this burgeoning interest is rooted in the superior oxygen reduction kinetics and the cost-effectiveness of catalysts attributed to the high-pH working conditions within AEMFCs, which collectively position them as viable substitutes for PEMFCs.…”

Section: Introductionmentioning

confidence: 99%

“…1–3 Within the domain of fuel cell technologies, proton exchange membrane fuel cells (PEMFCs) are advantageous in terms of power density and cell durability due to the utilization of high-performance Nafion membranes. 4–6 Nevertheless, PEMFC advancement has not been devoid of challenges, particularly owing to the pervasive reliance on expensive platinum group metals (PGMs) as the eletrocatalysts. 5,7–10 In this context, anion exchange membrane fuel cells (AEMFCs) have attracted considerable attention as a promising alternative to their PEMFC counterparts.…”

Section: Introductionmentioning

confidence: 99%

Four-arm star-shaped high-performance poly(aryl piperidine) anion exchange membranes for fuel cells

Han,

Gong,

Zhang

et al. 2024

J. Mater. Chem. A

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Tailoring the microphase separation structure of poly(crown ether) anion exchange membranes by introducing aliphatic chains

Cited by 8 publications

References 62 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

Fluorinated Poly(thiophene-based aryl piperidinium) Anion-Exchange Membranes Containing Dual Cation–Dipole Interactions for Alkaline Fuel Cells

Four-arm star-shaped high-performance poly(aryl piperidine) anion exchange membranes for fuel cells

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