Abstract: Carbon nanotubes prepared by a catalytic pyrolysis method were oxidized and homogeneously deposited with Pt and
Pt/Ru nanoparticles on their surfaces. The experimental results show that the catalysts of Pt deposited on carbon nanotubes of the proton exchange
membrane fuel cell are easily poisoned by CO and lose their activity, which make the fuel cell voltage decrease sharply with decreasing of
current density. But their ability to resist CO poisoning improves when Pt/Ru deposited on carbon nanotubes as catalysts, this
suggests that Ru can oxidize CO adsorbed on the surfaces of Pt into CO₂, so the catalyst ability to resist CO poisoning increases.

Key words: carbon nanotubes, platinum, ruthenium, proton exchange membrane fuel cell