Patent ID: 8865372

Claim:
A separator for a fuel cell that is capable of contacting either an anode or a cathode of an MEA (membrane electrode assembly) of a fuel cell and interposing a fluid diffusion layer, the separator comprising: a flow field channel for allowing a fluid to flow between the separator and the fluid diffusion layer, wherein the flow field channel is defined by ribs and is formed as a groove, a lamellar structure graphite foil; and a hydrophobic layer formed by impregnation on an interior side of the groove of the flow field channel, the interior side of the groove of the flow field channel having a roughness of decades of micrometers; wherein the hydrophobic layer is formed only on the interior side of the groove; and wherein the lamellar structure graphite foil comprises a stainless steel layer therewithin, and wherein the stainless steel layer has a portion that is directly contacting the hydrophobic layer.