Sulfonated polystyrene fiber network-induced hybrid proton exchange membranes

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Proton exchange membranes (PEMs) are crucial for fuel cell performance.
• Nafion is a widely used PEM material, but its conductivity can be limited.
• Developing advanced PEMs with enhanced proton transport is an active research area.

Purpose of the Study:

• To fabricate and characterize a novel hybrid membrane for proton exchange membrane fuel cells (PEMFCs).
• To improve proton conductivity by incorporating sulfonated polystyrene (S-PS) electrospun fibers into a Nafion matrix.
• To investigate the relationship between fiber characteristics and membrane performance.

Main Methods:

• Fabrication of hybrid membranes by incorporating S-PS electrospun fibers into Nafion.
• Characterization of membrane structure and morphology.
• Measurement of proton conductivity of the hybrid membranes.
• Tuning of fiber diameters to control conductivity.

Main Results:

• The hybrid membranes exhibited enhanced proton conductivity compared to recast Nafion.
• Sulfonic acid groups aggregated at the S-PS/Nafion interface, creating efficient proton transport pathways.
• Proton conductivity was controllable by adjusting the diameter of the S-PS fibers.

Conclusions:

• Hybrid membranes incorporating ionic-conducting nanofibers offer a promising strategy for designing high-performance PEMs.
• The S-PS/Nafion hybrid membrane architecture facilitates facile proton transport.
• This approach provides a pathway for the rational design of advanced materials for fuel cell applications.