Polymer blends as proton-exchange membrane materials for fuel cells

Blends of sulfonated poly(ether ketone ketone) (SPEKK) and poly(ether imide) (PEI) are being considered as proton-exchange membranes (PEMs) to achieve high conductivities while maintaining the mechanical stability required for use in fuel cells. Proton conductivity comparable to Nafion has been obtained. Variables such as the SPEKK sulfonation level, the blend composition and the membrane casting procedure affect the blend microstructure and the fuel cell performance.