Electric Field-Assisted Filling of Sulfonated Polymers in ePTFE Backing Material for Fuel Cell

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Proton-exchange membranes (PEMs) are crucial for electrochemical devices.
• Composite membranes offer enhanced properties over single-component materials.
• Efficient pore filling in composite structures is key to performance.

Purpose of the Study:

• To fabricate a composite ePTFE-backed proton-exchange membrane.
• To investigate the effect of an externally supplied electric field on pore filling.
• To evaluate the performance of the resulting composite membrane.

Main Methods:

• Fabrication of composite membranes using ePTFE backing and sulfonated polyarylene ethers.
• Application of an external electric field during membrane fabrication.
• Morphological analysis using Scanning Electron Microscopy (SEM).
• Evaluation of membrane properties including dimensional stability, swelling ratio, water uptake, and proton conductivity.

Main Results:

• The electric field effectively filled pores in the ePTFE backing with sulfonated polyarylene ethers.
• SEM analysis confirmed improved polymer infiltration due to the electric field.
• The composite membrane exhibited good dimensional stability and a favorable swelling ratio.
• Water uptake, proton conductivity, and component efficiency increased with applied voltage.

Conclusions:

• An external electric field is an effective method for achieving uniform pore filling in ePTFE-backed composite membranes.
• The enhanced pore filling directly translates to improved proton conductivity and overall membrane performance.
• This fabrication technique offers a promising route for developing advanced proton-exchange membranes.