Abstract
The performance of a proton exchange membrane fuel cell (PEMFC) was evaluated at 80°C in 
with defined amounts of CO (25 to 250 ppm) and pure oxygen. Membrane electrode assemblies (MEAs) were made using Nafion™ 117 with carbon‐supported dispersed Pt, 
, and 
as anode catalysts, and Pt as a cathode catalyst. For comparison the MEAs were first characterized in 
. In 
steady‐state current‐voltage curves were obtained after a poisoning period. It was found that the performance of the cell depends strongly on the CO concentration and the anode catalyst used. For 
as anode catalyst, the maximum power density in 
was enhanced by a factor of four compared with a Pt anode catalyst. Using 
no difference in power density was found between pure 
and 
/100 ppm CO up to current densities of about 
.