Proton exchange membranes based on poly(2,5-benzimidazole) and sulfonated poly(ether ether ketone) for fuel cells

► Poly(2,5benzimidazole) and sulfonated poly(ether ether ketone) blend membranes are first reported. ► High conductivities of the blend membranes. ► High thermal stability of the blend membranes. ► High acid/water uptake of the blend membranes.