| abstract |
PROBLEM TO BE SOLVED: To provide an electrolyte membrane which is i) excellent in methanol permeation prevention property, iii) has no or reduced area change, and iv) has excellent proton conductivity. Provide a fuel cell, particularly a polymer electrolyte fuel cell, and more specifically, a direct methanol solid polymer fuel cell. SOLUTION: This is an electrolyte membrane in which pores of a porous substrate are filled with a first polymer having proton conductivity, wherein the porous substrate is at least selected from the group consisting of polyimides and polyamides. The above problem is solved by an electrolyte membrane having one kind of second polymer; and a fuel cell using the electrolyte. |