Approach to make a high performance membrane electrode assembly (MEA) for a PEM fuel cell
View Patent ↗An electrically conductive fluid distribution element for use in a fuel cell having a conductive non-metallic porous media having a surface with an electrically conductive metal deposited along one or more metallized regions. The metallized regions are arranged to contact a membrane electrode assembly (MEA) in a fuel cell assembly, and thus improve electrical conductance at contact regions between the MEA and the fluid distribution media. Methods of making such a fluid distribution element and operating fuel cell assemblies are also provided.
1. A fluid distribution element for a fuel cell having a membrane electrode assembly (MEA), the element comprising:
a layer of electrically conductive porous media comprising carbon and one or more metallized regions on a surface of said layer confronting the MEA, said one or more metallized regions comprising an electrically conductive metal deposited on surfaces of pores of said porous media, and wherein said one or more metallized regions contact a major surface of the MEA and form respective electrically conductive paths between the MEA through said interconnected pores of said porous media to at least one bipolar plate, wherein said surface of said layer is a first surface and said layer further comprises a second surface opposite to said first surface, wherein said second surface contacts an impermeable electrically conductive separator element, wherein said second surface has one or more metallized regions comprising an electrically conductive metal.
2. The element of claim 1 , wherein each of said metallized regions provides a reduced electrical resistivity through said respective electrically conductive paths as compared to a non-metallized region of porous media.
3. The element of claim 1 , wherein said one or more metallized regions have an ultra-thin thickness, wherein said ultra-thin thickness is less than about 40 nm.
4. The element of claim 1 , wherein a thickness of each of said metallized regions is less than about 10 nm.
5. The element of claim 1 , wherein a thickness of each of said metallized regions is between about 5 nm to about 10 nm.
6. The element of claim 1 , wherein said porous media is selected from the group consisting of: paper, woven cloth, non-woven cloth, fiber, and foam.
7. The element of claim 1 , wherein said electrically conductive metal of said metallized regions comprises a noble metal.
8. The element of claim 1 , wherein said metallized regions comprise a compound of said electrically conductive metal.
9. The element of claim 1 , wherein said metallized regions comprise a metal selected from the group consisting of: Ru, Rh, Pd, Ag, Ir, Pt, Os, Ti, Cr, Sn, Au, and mixtures thereof.
10. The element of claim 1 , wherein said electrically conductive metal comprises Au.