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 7 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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Poly(Arylene Alkylene)s with Tetrazole Pendants for Alkaline Ion‐Solvating Polymer Electrolytes

Xia,

Rajappan,

Chen

et al. 2024

ChemSusChem

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Alkaline ion‐solvating membranes derived from a tetrazole functionalized poly(arylene alkylene) are prepared, characterized and evaluated as electrode separators in alkaline water electrolysis. The base polymer, poly[[1,1′‐biphenyl]‐4,4′‐diyl(1,1,1‐trifluoropropan‐2‐yl)], is synthesized by superacid catalyzed polyhydroxyalkylation and subsequently functionalized with tetrazole pendants. After equilibration in aqueous KOH, the relatively acidic tetrazole pendants are deprotonated to form the corresponding potassium tetrazolides. The room temperature ion conductivity is found to peak at 19 mS cm−1 in 5 wt. % KOH, and slightly declines with increasing KOH concentration to 13 mS cm−1 in 30 wt. % KOH. Based on an overall assessment of the mechanical properties, conductivity and electrode activity, 30 wt. % KOH is applied for alkaline electrolysis cell tests. Current densities of up to 1000 mA cm−2 were reached with uncatalyzed Ni‐foam electrodes at a cell voltage of less than 2.6 V, with improved gas barrier characteristics compared to that of the several times thicker Zirfon separator.

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Partially PEG‐Grafted Poly(Terphenyl Piperidinium) Anion Exchange Membranes with Balanced Properties for Alkaline Fuel Cells

Chu,

Shao,

Zhang

et al. 2024

Macromol. Rapid Commun.

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Poly(ethylene glycol) (PEG) or oligo (ethylene glycol) (OEG) grafted anion exchange membranes (AEMs) exhibit improved ionic conductivity, high alkaline stability, and subsequent boosted AEM fuel cell performance, but too much PEG/OEG side chains may can result in a reduction in the ion exchange capacity (IEC), which can have adverse effects on ion transport. Here, a series of partially PEG‐grafted poly(terphenyl piperidinium) with different side chain length are synthesized using simple postpolymerization modification to produce AEMs with balanced properties. The polar and flexible PEG side chains are responsible for the controlled water uptake and swelling, superior hydroxide conductivity (122 mS cm−1 at 80 °C with an IEC of 1.99 mmol g−1), and enhanced alkaline stability compared to the reference sample without PEG grafts (PTP). More importantly, the performance of AEM fuel cell (AEMFC) with the membrane containing partial PEG side chains surpasses that with PTP membrane, demonstrating a highest peak power density of 1110 mW cm−2 at 80 °C under optimized conditions. This work provides a novel approach to the fabrication of high‐performance AEM materials with balanced properties for alkaline fuel cell application.

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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 7 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

Poly(Arylene Alkylene)s with Tetrazole Pendants for Alkaline Ion‐Solvating Polymer Electrolytes

Partially PEG‐Grafted Poly(Terphenyl Piperidinium) Anion Exchange Membranes with Balanced Properties for Alkaline Fuel Cells

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