NOVELTY - The fuel cell component comprises a substrate (12), a flow field layer (16) disposed adjacent to the substrate, and a diffusion medium layer (14). The flow field layer includes radiation-cured reactant flow channels (20) and radiation-cured coolant channels for a fuel cell, and is disposed between the substrate and the diffusion medium layer and/or disposed on the diffusion medium layer opposite to the substrate. The diffusion medium layer has a microtruss structure. The microtruss structure includes first truss elements extending along a first direction and second truss elements.    USE - Used as a fuel cell component such as a diffusion media, separator plates and membrane reinforcement, where the fuel cell such as a polymer electrolyte membrane fuel cell is useful for electric vehicles and portable devices.    ADVANTAGE - The fuel cell component is rapid and economical to fabricate, enhances durability of the fuel cell, and reduces size and development time of the fuel cell.    DETAILED DESCRIPTION - The fuel cell component comprises a substrate (12), a flow field layer (16) disposed adjacent to the substrate, and a diffusion medium layer (14). The flow field layer includes radiation-cured reactant flow channels (20) and radiation-cured coolant channels for a fuel cell, and is disposed between the substrate and the diffusion medium layer and/or disposed on the diffusion medium layer opposite to the substrate. The diffusion medium layer has a microtruss structure. The microtruss structure includes first truss elements extending along a first direction, second truss elements extending along a second direction, and third truss elements extending along a third direction. The first, second, and third truss elements interpenetrate each other at nodes (18) to form a continuous, three-dimensional self-supporting structure. The flow field layer further includes first channel walls extending along one direction, second channel walls extending along another direction, support ligaments, and first and second flow field layers. The first and second channel walls interpenetrate each other at junctions to form the reactant flow channels and the coolant channels. The diffusion medium layer and/or the flow field layer has an electrically conductive coating. The support ligaments are defined by self-propagating polymer ligament waveguides, are disposed between the channel walls and the substrate and/or the diffusion medium layer, and militate against a flexing of the first and second channel walls. The first and second channel walls are defined by first and second self-propagating polymer wall waveguides respectively. The diffusion medium layer includes first and second diffusion medium layers. The substrate is disposed between the first and second flow field layers. The substrate and the first and second flow field layers are disposed between the first and second diffusion medium layers. Each of the diffusion medium layers has microporous layers. Each of the microporous layers has electrodes placed opposite to the diffusion medium layer. One of the electrodes has a polymer electrolyte membrane. The first flow field layer has electrically conductive walls formed by coating an electrically conductive material on removable cores. The substrate is integral with the first flow field layer. One of the diffusion medium layers has a membrane electrode assembly flow disposed on the diffusion medium layers.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic side cross-sectional view of a fuel cell component.    Substrate (12)    Diffusion medium layer (14)    Flow field layer (16)    Nodes (18)    Radiation-cured reactant flow channels. (20)