4.5 Review

Different Approaches for the Preparation of Composite Ionic Liquid-Based Membranes for Proton Exchange Membrane Fuel Cell Applications-Recent Advancements

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Summary: In this study, the imidazolium ionic liquid of (Kevlar/bmimCl/SEBS)5 membrane was immobilized in flexible proton exchange membranes (PEMs) using spin coating technology. The well-ordered distribution of components in the multilayered microstructure reduced proton conduction resistance. The stretching and folding operations had negligible effects on the microstructure and properties of the prepared PEMs, and the proton conductivities were improved compared to pristine membranes. The tensile stress values of the folding and stretching membranes were also satisfactory.

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Summary: This article focuses on water management in proton exchange membrane fuel cells (PEMFCs), introducing the latest research and progress on membrane electrode assembly (MEA) components and summarizing the influencing factors on their properties. The properties of each component play a significant role in fuel cell performance, with strong interactions between some properties. Clarifying the influence mechanisms of various properties and their interactions on fuel cell performance is crucial for designing high-performance FCs.

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A Critical Review on the Use of Ionic Liquids in Proton Exchange Membrane Fuel Cells

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Summary: This paper provides a comprehensive review on the incorporation of ionic liquids (ILs) into polymer blends and their utilization as proton exchange membranes (PEM). It discusses various conventional polymers that incorporate ILs and presents the methods of synthesis of IL/polymer composite membranes. The paper concludes that the presence of certain ILs can increase the conductivity of the PEM and enhance the performance of PEMFCs, but highlights the challenges of leakage and limited long-term thermal and mechanical stability.

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Phosphorylated chitosan/poly(vinyl alcohol) based proton exchange membranes modified with propylammonium nitrate ionic liquid and silica filler for fuel cell applications

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Fengxiang Liu et al.

Summary: Poly(ionic liquid)s with ion-pair aggregates are recognized as excellent modifiers for high-temperature proton exchange membranes. In this study, a bulky ionic liquid, N-(4-chlorobutyl)-N'-(5-Pentenyl)-1,4-diazoniabicyclo-[2.2.2]-octane bromide ([CPDOc]Br-2), was synthesized and incorporated into polybenzimidazole (PBI) polymer as side groups. Through an in-situ free radical reaction, the cross-linked networks and poly(ionic liquid) were formed simultaneously during the membrane fabrication. Finally, the anions were exchanged into H2PO4- with base-acid doping. As a result, the PBI-CPDOc30 membrane with low PA uptake (139%) exhibited the highest conductivity (0.121 S cm(-1) at 170 degrees C), higher than that of PBI (0.083 S cm(-1)) with a PA uptake of 221%. Moreover, the PBI-CPDOc20 membrane exhibited a PA retention of up to 81% after the 400-hour test at 160 degrees C.

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Protic ionic liquids/poly(vinylidene fluoride) composite membranes for fuel cell application

Isabel Vazquez-Fernandez et al.

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Enhanced Performance of Polymer Electrolyte Membranes via Modification with Ionic Liquids for Fuel Cell Applications

Jonathan Teik Ean Goh et al.

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New polymer electrolyte membrane for medium-temperature fuel cell applications based on cross-linked polyimide Matrimid and hydrophobic protic ionic liquid

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SnO2 nanoparticles dispersed carboxylated Poly(arylene ether sulfones) nanocomposites for proton exchange membrane fuel cell (PEMFC) applications

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Applications of poly ionic liquids in proton exchange membrane fuel cells: A review

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Novel double cross-linked membrane based on poly (ionic liquid) and polybenzimidazole for high-temperature proton exchange membrane fuel cells

Fengxiang Liu et al.

Summary: Novel double cross-linked composite membranes were successfully fabricated using diazoniabicyclo-type poly (ionic liquid) with trimethoxysilane groups ([TSPDO]BrCl) and norbornene-type polybenzimidazole (NbPBI). The membranes exhibited enhanced thermal stability, mechanical properties, and proton conductivity, with the NbPBI-TSPDO30 membrane showing the highest proton conductivity at 170 degrees C. Furthermore, the membranes displayed improved PA retention rates under different temperature and humidity conditions.

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A review of proton exchange membranes based on protic ionic liquid/polymer blends for polymer electrolyte membrane fuel cells

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Summary: Protic ionic liquids are receiving increasing research attention due to their versatile properties, particularly as ideal electrolytes for proton exchange membrane fuel cells. Blending various polymers with protic ILs to form solid films for PEMFCs has been explored. Five conventional polymers combined with protic ILs are discussed in detail, along with other polymers used in PEMs based on protic ILs, to provide comprehensive coverage in this area of research.

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