A fuel cell collector plate can be provided with one or more various
channel constructions for the transport of reactants to the gas diffusion
layer and the removal of water therefrom. The outlet channel can be
arranged to have a reduced volume compared to the inlet channel, in both
interdigitated and discontinuous spiral applications. The land width
between an inlet channel and outlet channel can be reduced to improved
mass flow rate in regions of deleted reactant concentrations. Additionally
or alternatively, the depth of the inlet channel can be reduced in the
direction of flow to reduce the diffusion path as the concentration of
reactant is reduced.