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Abstract
The ensemble site requirements for the oxidative adsorption of methanol and ethanol on platinum based membrane electrode assemblies in operating liquid feed fuel cells were measured by CO stripping voltammetry. At 30 °C and 0.2 V vs reference hydrogen electrode (RHE), the COads coverage from directly dosed CO (COCO), methanol (COMeOH), and ethanol (COEtOH) are 94%, 49%, and 39%, respectively. At 50 °C the COMeOH and COEtOH approach equality. The ratio of COEtOH/COMeOH was simulated with assumed ensemble site requirements of 3 and 2 for ethanol and methanol respectively. Experimental and simulated ratios of 0.79 and 0.78 suggest that high surface area fuel cell Pt catalysts at 30 °C have adsorption properties similar to that of a Pt (100) surface. Potential dependent infrared spectroscopy of COMeOH and COEtOH from flash evaporated aqueous alcohols delivered to a 50 °C fuel cell show lower COEtOH relative to COMeOH with Stark tuning rates below 10 cm–1/V.
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