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For use in a fuel cell, constituted by plural cells, a separator that can reduce fluctuations in electromotive force across respective cells. An electrically conductive member 3, as a separator, and a processing electrode 16, having patterned electrode projections 20, are immersed in an electrolytic

For use in a fuel cell, constituted by plural cells, a separator that can reduce fluctuations in electromotive force across respective cells. An electrically conductive member 3, as a separator, and a processing electrode 16, having patterned electrode projections 20, are immersed in an electrolytic solution facing each other. Current is fed between member 3 and electrode 16 for electrolytic processing to dissolve the portion of the member 3 facing projections 20, thus forming a gas path 30 having a surface roughness Rz on this bottom surface 30e not larger than 1 .mu.m. Using the separator having the gas path with extremely smooth bottom surface, the gas flow in each cell proceeds in a reduced fluctuation to reduce fluctuations in the electromotive force.

대표청구항

1. A separator of a fuel cell,wherein said separator comprises a plate having a recessed gas path in which flows a gas containing an active material, and wherein said gas path has a bottom surface in the plate possessing a surface roughness not larger than 1 .mu.m in terms of Rz.

1. A separator of a fuel cell,wherein said separator comprises a plate having a recessed gas path in which flows a gas containing an active material, and wherein said gas path has a bottom surface in the plate possessing a surface roughness not larger than 1 .mu.m in terms of Rz.