| 摘要 |
A polymer electrolyte fuel cell unit comprising (a) a polymer electrolyte membrane 2 , (b) a pair of gas-diffusible electrodes 3, 4 respectively attached to both surfaces of the polymer electrolyte membrane 2 , (c) a pair of porous, gas-diffusible, conductive graphite collectors 5, 5 in contact with the outside of the electrodes 3, 4 , and (d) a pair of metal separators 7, 7 for introducing a fuel gas and an oxygen-containing gas separately into the electrodes 3, 4 ; a porous, conductive buffer layers 6, 6 having flexibility and gas permeability being provided between the metal separators 7, 7 and the graphite collectors 5, 5 ; and said metal separator 7, 7 being provided with a conductive, corrosion-resistant coating 9, 9 having a thickness of 0.01 to 10 mum, whose polarization current is 10 muA/cm<SUP>2 </SUP>or less when measured by an electrochemical polarization evaluation method, at least on a surface in contact with said porous, conductive buffer layer 6, 6.
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