Platinum is the most efficient electrocatalyst for accelerating the oxygen reduction reaction in fuel cells. It is also expensive. Palladium-cobalt particles have been used to replace platinum to catalyze this reaction, leading to a much lower cost electrocatalyst.
Ternary alloys of palladium, cobalt, and a third transition metal are formed into nanoparticles, bound to a conducting medium, and applied as the anode in a fuel cell to reduce oxygen. Palladium-cobalt alloys may also incorporate two additional transition metals to make a four-component, or quaternary, alloy. These alloys are deployed on the anode of fuel cells as electrocatalysts for the oxygen reduction reaction. Nickel and iron are preferred transition metal components.
Applications and Industries
Fuel cell catalysts; oxygen-reduction; heterogeneous catalysis
The palladium-cobalt nanoparticles have the same catalytic activity as the highly expensive platinum nanoparticles making them a cheaper alternative to platinum.