Novel cross-linked poly(vinyl alcohol)-based electrolyte membranes for fuel cell applications

Area of Science:

• Materials Science
• Polymer Chemistry
• Electrochemistry

Background:

• Polymer electrolyte membranes (PEMs) are crucial components in fuel cells.
• Developing cost-effective and high-performance PEMs is an ongoing research challenge.
• Poly(vinyl alcohol) (PVA) and sulfonated poly(ether sulfone) (SPES) are promising materials for PEMs.

Purpose of the Study:

• To synthesize and characterize novel polymer electrolyte membranes (PEMs) by blending chemically cross-linked PVA and SPES.
• To investigate the effect of SPES concentration on the properties of the blend membranes.
• To evaluate the potential of these blend membranes for fuel cell applications.

Main Methods:

• Chemically cross-linked PVA and SPES were synthesized.
• SPES was prepared via post-sulfonation using chlorosulfonic acid.
• PVA-SPES blend membranes were fabricated with varying SPES concentrations.
• Structural analysis was performed using FTIR, SEM, and XRD.
• Ion-exchange capacity, water uptake, and proton conductivity were measured.

Main Results:

• The PVA-SPES-20 blend membrane exhibited superior ion-exchange capacity and water uptake compared to other compositions.
• The PVA-SPES-20 membrane demonstrated a proton conductivity of 0.0367 S cm^-1 at 30 °C.
• This represents a significant improvement over pristine PVA, which showed a conductivity of 0.0259 S cm^-1.

Conclusions:

• The developed PVA-SPES blend membranes show enhanced properties suitable for fuel cell applications.
• The PVA-SPES-20 composition is identified as a promising candidate for further development.
• This study contributes to the advancement of materials for efficient and durable fuel cells.