| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fuel cell maintaining high power generation efficiency for a long period by restraining an increase of contact resistance of a separator made of stainless steel, and pollution of a solid polymer film caused by eluted metal ion. <P>SOLUTION: The solid polymer fuel cell is formed by using a ferrite group stainless steel, containing chromium by 15 to 40 mass% and molybdenum by 1 to 5 mass% as a separator pinching a solid polymer film of one unit, having a passive film of which a ratio of the number of elements Mo, Cr, Fe contained in the passive film; Mo/(Mo+Cr+Fe) is not higher than 0.3, and higher than the ratio Mo/(Mo+Cr+Fe) of the base material by 1.5 times or higher, formed on the surface thereof. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
