Highly compatible acid-base blend membranes based on sulfonated poly(ether ether ketone) and poly(ether ether ketone-alt-benzimidazole) for fuel cells application

▸ SPEEK/PEEK-alt-BI blend membranes were prepared. ▸ The two polymers have good compatibility owing to their similar structure and ionic interaction of polymer chains. ▸ The comprehesive performances of SPEEK membranes were significantly improved by introducing PEEK-alt-BI. ▸ The blend membranes show promising selectivities of proton conductivity to methanol permeability.