PtCo catalysts with composition varying bet~veen Pts0Coz0 and Ph0Cog0 were prepared by electrochemical underpotential codeposition. The lYmaetallic catalysts were subjected to 1000 electrochemical cycles in 0.5 M HC104 at room temperature. The activity and stability of these electrodes for oxygen reduction was determined, in conjunction with the characterization of these catalysts with energy dispersive X-ray spectroscopy, X-ray photoelectron speclroscopy, and transmission electron microscopy. Although Pt-rich electrodes had better activity in the initial stages of potential cycling, highe~ Co ato~nic ratios led to higher stalYdity and higher oxygen reduction reaction (ORR) activity after electrochemical cycling. Ph0Cog0 turned out to be the best ehictfode among the alloys considered, in teems of ORR activity and stability, wl~lch is linked to a higher concentration of Co on the surface.

Summary: An increase in produced hydrogen peroxide concentration in exhaled breath (EB)

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