Patent ID: 8623568

Claim:
A flow field plate for use in a fuel cell, comprising: a non-porous plate body including a flow field having a plurality of channels extending between a channel inlet end and a channel outlet end, a first flow distribution portion adjacent the channel inlet end for distributing a reactant gas to the plurality of channels, and a second flow distribution portion adjacent the channel outlet end for collecting the reactant gas from the plurality of channels; a first flow guide within the first flow distribution portion for establishing a first mass transport rate of the reactant gas to an adjacent catalyst, the first flow guide including a plurality of first protrusions; and a second flow guide within the second flow distribution portion for establishing a second, different mass transport rate of the reactant gas to the adjacent catalyst, the second flow guide including a plurality of second protrusions, the plurality of first protrusions collectively differing from the plurality of second protrusions in at least one of population density, surface area and volume.