Layered electrodes and membrane electrode assemblies employing the same

摘要

According to at least one aspect of the present invention, a layered catalyst having an active area is provided. In at least one embodiment, the layered electrode includes a first catalyst layer having a first noble metal concentration and a first ionomer concentration, and a second catalyst layer disposed next to the first catalyst layer, the second catalyst layer having a second noble metal concentration different from the first noble metal concentration and a second ionomer concentration different from the first ionomer concentration. In at least another embodiment, the metallic alloy includes a metallic alloy of platinum, nickel, and cobalt.

主权项

1. A membrane electrode assembly comprising:
an ionic exchange membrane; a first layer disposed over the ionic exchange membrane and containing a Pt—Ni—Co catalyst; and a second layer disposed over the first layer and containing a pure metallic Pt catalyst and not containing Ru, the Pt concentration in the Pt—Ni—Co catalyst being higher than that of the pure metallic Pt catalyst to produce a decreasing loading differential extending away from the ionic exchange membrane.