The 60 wt% Pt–Ru catalysts supported on the activated carbons, Pt–Ru/AC, with a Pt:Ru ratio of 1:1 atomic were prepared using the pretreated activated carbons. The precursors of active metals were H2PtCl6 · H2O and RuCl3· xH2O from Alfa Aesar. Re-activated activated carbons were suspended and stirred in distilled water for 2 h, and the RuCl3·xH2O aqueous solution was added slowly to the activated carbon slurry followed by H2PtCl6 · H2O aqueous solution. These mixtures were reduced by modiGed borohydride method [4], and then washed repeatedly with distilled water till the pH of the Gltered water became lower than 7.5. Finally, dried at 120◦C for 12 h in the air condition.