US Patent 7704919 - Gold coated platinum nanoparticles

http://www.freepatentsonline.com/7704919.html

This patent from Brookhaven Science Associates includes some basic claims to gold coated nanoparticles used as electrocatalysts for fuel cells. Claim 1 reads:

1. An oxygen-reducing electrocatalyst comprised of gold-coated metal particles bound to an electrically conductive support, said gold-coated metal particles comprising a noble metal-containing core at least partially encapsulated by an atomically thin outer shell of a gold alloy.