Gyroid-Nanostructured All-Solid Polymer Films Combining High H⁺ Conductivity with Low H₂ Permeability

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Proton-exchange membrane fuel cells (PEMFCs) require membranes with high proton conductivity and low gas permeability.
• Current membranes often face trade-offs between these critical properties.

Purpose of the Study:

• To develop all-solid polymer films with enhanced proton conductivity and reduced hydrogen gas permeability.
• To explore gyroid nanostructures for improved membrane performance in fuel cells.

Main Methods:

• Crosslinking polymerization of zwitterionic monomers and polymerizable imide-type acids.
• Formation of bicontinuous cubic liquid-crystalline phases.
• Visualization of gyroid nanostructures using 3D electron mapping from synchrotron X-ray diffraction.

Main Results:

• Achieved high proton conductivity (order of 10⁻¹ S cm⁻¹).
• Demonstrated extremely low hydrogen gas permeability (order of 10⁻¹⁵ mol m m⁻² s⁻¹ Pa⁻¹).
• Properties attributed to ionic liquid-like layers along the gyroid minimal surface.

Conclusions:

• Gyroid-nanostructured polymer films offer a promising design for advanced fuel cell membranes.
• The developed materials address key requirements for improving PEMFC performance.
• This strategy contributes to the development of sustainable energy technologies.