US Patent 7589043 - Carbon/Pt nanocatalyst for fuel cells

http://www.freepatentsonline.com/7589043.html

This patent from Samsung SDI teaches a material to improve the energy conversion efficiency of fuel cells based on platinum nanoparticles coated on carbon support material. Claim 1 reads:

1. A supported catalyst comprising:

a carbon-based catalyst support; and

a multi-layer structure of metal catalyst particles having an average diameter of 3.5 to 5 nm on the carbon-based catalyst support and wherein an amount of metal catalyst particles is 80 to 90 parts by weight based on 100 parts by weight of the supported catalyst.