Adsorbed CO Stark tuning rates have been studied for the first time in direct methanol fuel cells on Pt black
catalysts supported only on the polymer electrolyte (Nafion) in membrane electrode assemblies. The bipolar
peaks resulting from the Stark shift of CO absorbance peaks are inverted, indicating an anomalous increase
in the reflectivity where CO infrared absorption occurs. The vibrational Stark tuning data suggests that CO
oxidation occurs on the perimeter of COads islands, which is consistent with the formation of CO within and
above Pt double layer potentials as reported by Kunimatsu. This is expected since methanol is continuously
delivered to the anode at all potentials in direct methanol fuel cells.
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