A polymer electrolyte membrane includes a poly(benzoxazole) polymer doped with at least one acid. The polymer electrolyte membrane is manufactured by impregnating poly(benzoxazole) with an acid and has better ionic conductivity at high temperatures and better mechanical properties than a conventional poly(benzoxazole) polymer electrolyte membrane. In addition, the polymer electrolyte membrane has equivalent thermal stability to a conventional polymer electrolyte membrane.

 
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< Proton-conducting polymer membrane comprising polymers containing phosphonic acid groups and its use in fuel cells

< Membrane electrode assembly and polymer electrolyte fuel cell therewith

> Membrane-electrode assembly for solid polymer electrolyte fuel cell and method of producing the same

> Fuel cell stack having catalyst coated proton exchange member
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