Ozonated Monolayer Graphene for Extended Performance and Durability in Hydrogen Fuel Cell Electric Vehicles

Area of Science:

• Materials Science
• Electrochemistry
• Chemical Engineering

Background:

• Proton exchange membrane fuel cells (PEMFCs) require membranes with low hydrogen crossover and high proton conductivity for efficiency and durability.
• Traditional methods to reduce hydrogen crossover often compromise proton conductivity, limiting fuel cell performance.
• Graphene-based materials offer potential for advanced membrane development due to their unique properties.

Purpose of the Study:

• To develop a novel graphene-based membrane for PEMFCs that mitigates hydrogen crossover without sacrificing proton conductivity.
• To investigate the use of UV-Ozone induced defects in graphene for enhanced membrane selectivity.
• To assess the durability and performance of the engineered graphene membrane under accelerated stress conditions.

Main Methods:

• Fabrication of a defect-engineered graphene material using UV-Ozone treatment.
• Characterization of the material's hydrogen/proton selectivity and hydrogen crossover rates.
• Testing membrane performance and durability in PEMFCs, including a 100-hour accelerated stress test (AST).

Main Results:

• Achieved a 27% increase in hydrogen/proton selectivity and a 24% decrease in H2 crossover.
• Demonstrated limited to no negative impact on the membrane's current output.
• Engineered membrane showed 39% greater durability than state-of-the-art GORE Select membranes, with no performance loss after AST.

Conclusions:

• UV-Ozone induced defects in graphene effectively enhance membrane selectivity for H2/H3O+ sieving.
• 2D material membranes are viable for industrial fuel cell applications, offering significant improvements over current technologies.
• This defect-engineered graphene membrane represents a scalable and durable solution for hydrogen fuel cell vehicles and clean energy generation.