Method Fpr Preparing an Enhanced Proton Exchange Membrane and Enhanced Proton Exchange Membrane

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This patent presents a novel method for producing enhanced proton exchange membranes (PEMs) for use in fuel cells by co-grafting styrene and methacrylonitrile (MAN) onto a base polymer film (such as ETFE). The incorporation of MAN significantly improves the membrane’s oxidative and chemical stability during operation without compromising its proton conductivity. The process is cost-effective and allows for fine-tuning of membrane properties by adjusting the composition.

Use CasesContent extracted from patent full text and abstract with AI.

• Polymer electrolyte membrane fuel cells (PEMFCs) for electric vehicles
• Stationary power generation using fuel cell technology
• Portable fuel cell systems for backup power and electronics
• Hydrogen-powered transportation systems
• Electrochemical sensors and separators requiring stable ion-conductive membranes
• Alternative to expensive perfluorinated membranes (like Nafion) in various electrochemical applications

BenefitsContent extracted from patent full text and abstract with AI.

• Dramatically increased chemical and oxidative stability, leading to longer membrane lifespan in fuel cells
• Comparable or improved performance to commercial PEMs (e.g., Nafion) at reduced cost
• Tunability of membrane properties (conductivity, stability, hydration) by adjusting MAN and cross-linker content
• Cost-effective alternative to state-of-the-art PEMs, enabling more affordable fuel cell commercialization
• Lower water uptake and improved dimensional stability of membranes
• Enhanced mechanical and interfacial properties in membrane electrode assemblies (MEAs)
• Resilience to pinhole formation and gas crossover, improving safety and durability

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Patent Abstract

A novel approach based on the increase of the intrinsic oxidative stability of uncrosslinked membranes is addressed. Hence, the co-grafting of styrene with methacrylonitrile (MAN), which possesses a protected a-position and strong dipolar pendant nitrile group, onto 25 µm ETFE base film is disclosed. Styrene / MAN co-grafted membranes were compared to styrene based membrane in durability tests in single H2/O2 fuel cells. It is shown that the incorporation of MAN dramatically improves the chemical stability. The membrane preparation based on the copolymerization of styrene and MAN shows encouraging results and offers the opportunity of tuning the MAN and crosslinker content to enhance the oxidative stability of the resulting fuel cell membranes.