Membrane electrode assembly and method for producing same, and polymer electrolyte fuel cell comprising such membrane electrode assemblies

The membrane electrode assembly comprising a pair of opposing electrodes each having a catalytic layer, and a polymer electrolyte membrane sandwiched by the electrodes, part of the catalytic layers being projecting into the polymer electrolyte membrane is produced by (1) coating a catalytic layer of...

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Main Authors Sohma, Hiroshi, Nanaumi, Masaaki, Matsuo, Junji, Saito, Nobuhiro, Andou, Keisuke, Sugiyama, Yuichiro, Fukuda, Kaoru
Format Patent
LanguageEnglish
Published 24.10.2002
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Summary:The membrane electrode assembly comprising a pair of opposing electrodes each having a catalytic layer, and a polymer electrolyte membrane sandwiched by the electrodes, part of the catalytic layers being projecting into the polymer electrolyte membrane is produced by (1) coating a catalytic layer of one electrode with a solution of a polymer electrolyte in an organic solvent, (2) coating the resultant polymer electrolyte membrane with a catalyst slurry for the other electrode, while the amount of the organic solvent remaining in the polymer electrolyte membrane is 5-20 weight % based on the polymer electrolyte membrane, and (3) after drying, hot-pressing the polymer electrolyte membrane and the electrodes formed on both sides of the membrane.