Synthesis and properties of novel cross-linked composite sulfonated poly (aryl ether ketone sulfone) containing multiple sulfonic side chains for high-performance proton exchange membranes

Add time:09/04/2019    Source:sciencedirect.com

The synthesis and properties of novel cross-linked composite sulfonated poly (aryl ether ketone sulfone) containing multiple sulfonic side chains as proton exchange membranes were investigated. The multiple side-chain membranes were prepared by direct polycondensation and simple free radical reaction. The cross-linked composite membranes were prepared by solvent coating method. The prepared membranes showed lower water absorption and swelling ratio than that of Nafion 117. The S-Am-2.0/C exhibited the highest proton conductivity of 0.135 S cm−1 at 80 °C, while its swelling ratio was only 3.59% at the same temperature. Much lower methanol permeability coefficients in the range of 3.11 × 10−8 cm2 s−1–7.25 × 10−7 cm2 s−1 compared to Nafion 117 (2.29 × 10−6 cm2 s−1) were also observed for the prepared membranes. Moreover, the S-Am-2.0/C exhibited higher peak power density (121.09 mW cm−2) than that of main-chain type C-SPAEKS membrane (66.65 mW cm−2). The results indicate that the cross-linked composite membranes are good candidate for fuel cells.

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