High-performance radiation grafted anion-exchange membranes for fuel cell applications: Effects of irradiation conditions on ETFE-based membranes properties

Biancolli, Ana Laura G.; Bsoul-Haj, Saja; Douglin, John C.; Barbosa, Andrey S.; Sousa, Rogério Ramos de; Rodrigues, Orlando; Lanfredi, Alexandre J. C.; Dekel, Dario R.; Santiago, Elisabete I.

doi:10.1016/j.memsci.2021.119879

Cited by 31 publications

(33 citation statements)

References 75 publications

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“…Given the outstanding stability of 3g , an AEM containing 3g was prepared for testing in an AEMFC. High-density polyethylene (HDPE) membranes (10 μm thick) that were radiation-grafted with 3/4-vinylbenzyl chloride , were added to a toluene solution of 4 to obtain a tetramethoxy-substituted isoindolinium HDPE ( TMISO-HDPE ) AEM. The solution was heated to 65 °C for 3 days.…”

Section: Resultsmentioning

confidence: 99%

Isoindolinium Groups as Stable Anion Conductors for Anion-Exchange Membrane Fuel Cells and Electrolyzers

et al. 2022

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Anion-exchange membrane (AEM) fuel cells (AEMFCs) and water electrolyzers (AEMWEs) have gained strong attention of the scientific community as an alternative to expensive mainstream fuel cell and electrolysis technologies. However, in the high pH environment of the AEMFCs and AEMWEs, especially at low hydration levels, the molecular structure of most anion-conducting polymers breaks down because of the strong reactivity of the hydroxide anions with the quaternary ammonium (QA) cation functional groups that are commonly used in the AEMs and ionomers. Therefore, new highly stable QAs are needed to withstand the strong alkaline environment of these electrochemical devices. In this study, a series of isoindolinium salts with different substituents is prepared and investigated for their stability under dry alkaline conditions. We show that by modifying isoindolinium salts, steric effects could be added to change the degradation kinetics and impart significant improvement in the alkaline stability, reaching an order of magnitude improvement when all the aromatic positions are substituted. Density functional theory (DFT) calculations are provided in support of the high kinetic stability found in these substituted isoindolinium salts. This is the first time that this class of QAs has been investigated. We believe that these novel isoindolinium groups can be a good alternative in the chemical design of AEMs to overcome material stability challenges in advanced electrochemical systems.

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Section: Resultsmentioning

confidence: 99%

Isoindolinium Groups as Stable Anion Conductors for Anion-Exchange Membrane Fuel Cells and Electrolyzers

et al. 2022

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“…6). The most common relevant backbones cited in the literature used for AEMs are: polysulphone type [262][263][264][265][266] poly(ether ketone) type, [267][268][269][270] poly(ether imide) type, [271][272][273] poly(ether oxadiazole) type, [275][276][277] and poly(phenylene oxide) type, 274,[278][279][280][281][282] polyphenylene type, [283][284][285] fluorinated type, [286][287][288][289][290][291] polybenzimidazole type, [292][293][294][295][296][297][298] polyethylene type, [299][300][301][302][303][304][305][306] and polystyrene type. 264,…”

Section: Alkaline Water Electrolysermentioning

confidence: 99%

Water electrolysis: from textbook knowledge to the latest scientific strategies and industrial developments

et al. 2022

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“…144 Deficiencies of poly(aryl ether)s have motivated the pursuit and synthesis of other ether-less hydrocarbon backbones such as polystyrene, 145 polynorbornene, 146 polyethylene 147 and ethylene tetrafluoroethylene (ETFE) as shown in Figure 6. 148 These polymer systems have demonstrated good performance and are increasingly attractive especially as evidence mounts of poly(aryl ether) containing AAEMs suffering from deleterious reactions, including loss of specific functional groups or backbone chain scission. 99,64,65 Finally, poly(aryl piperidium) 149,150 and poly(benzimidazolium) 151 AAEMs have shown immense promise for enhanced longevity under alkaline conditions, which is likely due to increased hydroxide resistance provided by steric hinderance (i.e.…”

Section: Polymer Designmentioning

confidence: 99%

Tuning Material Properties of Alkaline Anion Exchange Membranes Through Crosslinking: A Review of Synthetic Strategies and Property Relationships

Clemens

Jayathilake

Karnes

et al. 2022

Preprint

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Alkaline anion exchange membranes (AAEMs) are an enabling component for next generation electrochemical applications, including alkaline fuel cells, alkaline water electrolyzers, CO2 electrochemical reduction, and flow batteries. While commercial systems, notably fuel cells, have traditionally relied on proton-exchange membranes (PEMs), hydroxide-ion conducting AAEMs hold promise as a way to reduce cost-per-device by enabling the use of less expensive non-platinum group electrodes and cheaper cell components. AAEMs have undergone significant material development over the past two decades resulting in substantial improvements in hydroxide conductivity, alkaline stability, and dimensional stability. Despite these advances, challenges still remain in the areas of durability, water management, high temperature performance, and selectivity. In this review we discuss crosslinking as a synthesis tool for tuning various AAEM material properties, such as water uptake, conductivity, alkaline stability, and selectivity, and we describe synthetic strategies for incorporating crosslinks during membrane fabrication.

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High-performance radiation grafted anion-exchange membranes for fuel cell applications: Effects of irradiation conditions on ETFE-based membranes properties

Cited by 31 publications

References 75 publications

Isoindolinium Groups as Stable Anion Conductors for Anion-Exchange Membrane Fuel Cells and Electrolyzers

Isoindolinium Groups as Stable Anion Conductors for Anion-Exchange Membrane Fuel Cells and Electrolyzers

Water electrolysis: from textbook knowledge to the latest scientific strategies and industrial developments

Tuning Material Properties of Alkaline Anion Exchange Membranes Through Crosslinking: A Review of Synthetic Strategies and Property Relationships

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