| 摘要 |
PROBLEM TO BE SOLVED: To provide a stainless steel separator for a low temperature fuel cell capable of preventing great increase in contact resistant even after a long- term operation of the fuel cell and effective in improvement of power generation efficiency. SOLUTION: In this stainless steel separator, a conductive ceramics layer is formed on the surface of a stainless steel plate facing a fuel electrode in the fuel cell, and a passivation film is formed on the surface of the stainless steel plate facing an oxidation electrode. As the conductive ceramics layer, TiN, TiC, CrC, TaC, B4 C, SiC, WC, TiN, ZrN, CrN, HfC and the like are available, and the conductive ceramics layer is formed by sputtering, vacuum evaporation and the like. Desirably, the surface of the stainless steel plate facing the oxidation electrode is coated with a passivation film by immersion in nitric acid after roughening process based on alternating electrolysis etching. |
