Aryl ether-free polymer electrolytes for electrochemical and energy devices

Park, Eun Joo; Jannasch, Patric; Miyatake, Kenji; Bae, Chulsung; Noonan, Kevin; Fujimoto, Cy; Holdcroft, Steven; Varcoe, John R.; Henkensmeier, Dirk; Guiver, Michael D.; Kim, Yu Seung

doi:10.1039/d3cs00186e

Cited by 24 publications

(2 citation statements)

References 722 publications

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Section: Electrochemical Oxidation Of Ionomersmentioning

confidence: 99%

“…Anion-exchange membrane water electrolyzers (AEMWEs) present a promising alternative, mirroring the principles of PEMWEs but eschewing expensive materials in favor of PGM-free catalysts and more cost-effective separator plates . However, the performance and durability of AEMWEs, which are fed with pure water, are notably inferior to their PEMWE counterparts. , The main cause of the poor performance of AEMWEs has been the subject of much recent work.…”

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confidence: 99%

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Addressing the Challenge of Electrochemical Ionomer Oxidation in Future Anion Exchange Membrane Water Electrolyzers

Lim,

Klein,

Lee

et al. 2024

ACS Energy Lett.

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Hydrogen production through anion-exchange membrane water electrolyzers (AEMWEs) offers cost advantages over proton-exchange membrane counterparts, mainly due to the good oxygen evolution reaction (OER) activity of platinum-group-metal-free catalysts in alkaline environments. However, the electrochemical oxidation of ionomers at the OER catalyst interface can decrease the local electrode pH, which limits AEMWE performance. Various strategies at the single-cell-level have been explored to address this issue. This work reviews the current understanding of electrochemical ionomer oxidation and strategies to mitigate it, providing our perspective on each approach. Our analysis highlights the competitive adsorption strategy as particularly promising for mitigating ionomer oxidation. This Perspective also outlines future directions for advancing high-performance alkaline AEMWEs and other energy devices using hydrocarbon ionomers.

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Section: Electrochemical Oxidation Of Ionomersmentioning

confidence: 99%

mentioning

confidence: 99%

Addressing the Challenge of Electrochemical Ionomer Oxidation in Future Anion Exchange Membrane Water Electrolyzers

Lim,

Klein,

Lee

et al. 2024

ACS Energy Lett.

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Polyphenylene‐Based Anion Exchange Membranes with Robust Hydrophobic Components Designed for High‐Performance and Durable Anion Exchange Membrane Water Electrolyzers Using Non‐PGM Anode Catalysts

Liu,

Miyatake,

Mahmoud

et al. 2024

Advanced Energy Materials

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Alkaline‐stable, highly conductive anion exchange membranes (AEMs) are attentively expected solid polymer electrolytes that contribute to achieving high performance and durability for anion exchange membrane water electrolyzers (AEMWEs). The technical challenges of AEMs mainly stem from the degradation of the polymer backbones, side chains, and anchoring cationic groups. Herein, new and stable AEMs (QTAF) are designed using 3,3′′‐dichloro‐2′,5′‐bis(trifluoromethyl)‐1,1′:4′,1′′‐terphenyl (TFP) monomers as the hydrophobic component incorporated into the polyphenylene backbone and 3,3′‐(2,7‐dichloro‐9H‐fluorene‐9,9‐diyl)bis(N,N‐dimethylpropane‐1‐amine) (AF) monomers as the hydrophilic component. After tuning the copolymer composition, the highest hydroxide ion conductivity (168.7 mS cm−1 at 80 °C) is achieved with the QTAF‐3.0 membrane. The QTAF‐3.0 membrane survives in harsh alkaline conditions (8 M KOH solution, 80 °C), with high conductivity (75.8 mS cm−1) after 810 h. A water electrolysis cell with QTAF‐3.0 membrane and non‐noble Ni0.8Co0.2O anode catalyst operates stably at a constant current density (1.0 A cm−2) for 1000 h with a negligible voltage increase rate of 1.1 µV h−1 after the initial voltage increase. The water electrolysis performance of the post‐tested QTAF‐3.0 cell is 1.83 V, only a 6.4% increase from the initial performance at 2.0 A cm−2, suggesting the high potential of the QTAF‐3.0 membrane for practical AEMWE applications.

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Ether‐Free Alkaline Polyelectrolytes for Water Electrolyzers: Recent Advances and Perspectives

Hu,

Wang,

Lee

2024

Angewandte Chemie

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Anion exchange membrane (AEM) water electrolyzers (AEMWEs) have attracted great interest for their potential as sustainable, environmentally friendly, low‐cost sources of renewable energy. Alkaline polyelectrolytes play a crucial role in AEMWEs, determining their performance and longevity. Because heteroatom‐containing polymers have been shown to have poor durability in alkaline conditions, this review focuses on ether‐free alkaline polyelectrolytes, which are more chemically stable. The merits, weaknesses, and challenges in preparing ether‐free AEMs are summarized and highlighted. The evaluation of synthesis methods for polymers, modification strategies, and cationic stability will provide insights valuable for the structural design of future alkaline polyelectrolytes. Moreover, the in‐situ degradation mechanisms of AEMs and ionomers during AEMWE operation are revealed. This review provides insights into the design of alkaline polyelectrolytes for AEMWEs to accelerate their widespread commercialization.

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Aryl ether-free polymer electrolytes for electrochemical and energy devices

Abstract: This review provides a depth of knowledge on the synthesis, properties and performance of aryl ether-free anion exchange polymer electrolytes for electrochemical and energy devices.

Cited by 24 publications

References 722 publications

Addressing the Challenge of Electrochemical Ionomer Oxidation in Future Anion Exchange Membrane Water Electrolyzers

Addressing the Challenge of Electrochemical Ionomer Oxidation in Future Anion Exchange Membrane Water Electrolyzers

Polyphenylene‐Based Anion Exchange Membranes with Robust Hydrophobic Components Designed for High‐Performance and Durable Anion Exchange Membrane Water Electrolyzers Using Non‐PGM Anode Catalysts

Ether‐Free Alkaline Polyelectrolytes for Water Electrolyzers: Recent Advances and Perspectives

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