| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a electrolyte polymer membrane which has excellent oxidation resistance and almost equal heat resistance to a conventional one, a membrane electrode structure with the electrolyte polymer membrane, and a solid polymer fuel cell with the membrane electrode structure. <P>SOLUTION: The polymer electrolyte membrane 1 comprises a sulfocation product of a polymer having an aromatic group in a main chain and/or a side chain, and an antioxidant, wherein the antioxidant has a plurality of phenol groups and is composed of only carbon atoms and hydrogen atoms excluding the oxygen atoms of the phenol groups. The membrane is a composite polymer electrolyte membrane 6 which consists of the polymer electrolyte membrane 4 comprising the sulfonation product of a polymer having an aromatic group in the main chain and/or a side chain and a pair of buffer layers 5 and 5' sandwiching the polymer electrolyte membrane 4. The buffer layer 5 comprises an ionic conductive substance and an antioxidant. The antioxidant has a plurality of phenol groups and is composed of only carbon atoms and hydrogen atoms excluding the oxygen atoms of the phenol groups. The pair of buffer layers 5 and 5' has totally a thickness less than the polymer electrolyte membrane 4 does. <P>COPYRIGHT: (C)2003,JPO |
