Investigation and Characterization of the Effects of PEEK Sulfonation Parameters on Proton Exchange Membrane Properties for Direct Methanol Fuel Cells

May 12, 2026Fuel Cells

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The aim is to examine how different sulfonation parameters affect the properties of sPEEK membranes for direct methanol fuel cells.
Synthesis of sPEEK membranes with varying PEEK/acid ratios (4%, 5%, 8%, 10%, and 12% wt) via solution casting.
Characterization of molecular weight, ion exchange capacity, and degree of sulfonation for all membranes.
Performance testing of membranes in direct methanol fuel cells at specific conditions (3 M methanol, 80°C).
sPEEK membranes demonstrated increased peak current densities: 62 mA cm−2 for sPEEK12, down to 43 mA cm−2 for sPEEK4.
Power densities ranged with sPEEK12 at 27 mW cm−2 to sPEEK4 at 17 mW cm−2, indicating variability with sulfonation.
Overall performance suggests that controlled sulfonation enhances proton conductivity and membrane effectiveness in fuel cells.

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Investigates sulfonation effects on membrane properties for fuel cells, indicating improvements in performance.

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KHOSHNOUDI et al. (2026) studied this question.

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