A plate (11) is made from an electrically conductive material impermeable to all fluids used in the fuel cell assembly. The plate has a useful surface (S) over which gases used in electrochemical reaction in a fuel cell are distributed, and a recess that is defined by forming a peripheral section (P) thicker than the useful surface. A flexible graphite foil (11C) is applied over the entire surface of the recess, and having a distribution channel (111) for one fluid in the fuel cell. The distribution channel is completely formed in the graphite foil, and does not contact the useful surface.
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