| 摘要 |
A fuel cell ( 1 ) comprises a cathode catalyst layer ( 3 ) and an anode catalyst layer ( 4 ) disposed on each surface of an electrolyte membrane ( 2 ), an oxidant gas passage ( 8 ) facing the cathode catalyst layer ( 3 ), and a fuel gas passage ( 9 ) facing the anode catalyst layer ( 9 ). The cathode catalyst layer ( 3 ) contains a metal catalyst ( 16 ). In a region (A), in which the differential electric potential between the cathode catalyst layer ( 3 ) and the electrolyte membrane ( 2 ) is larger than in another region, the metal catalyst ( 16 ) content of the cathode catalyst layer or the specific surface area of the metal catalyst ( 16 ) in the form of minute parti<img id="custom-character-00001" he="2.56mm" wi="46.20mm" file="US20070224477A1-20070927-P00999.TIF" alt="text missing or illegible when filed" img-content="character" img-format="tif"/>
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