Abstract
Proton exchange membrane fuel cells exposed to 300 ppm C2H2 were studied in situ with chronopotentiometry, chronoamperometry, cyclic voltammetry and gas chromatography. Fuel cells significantly lost and fully regained performance at all tested cell potentials. The performance changes were due to the presence of C2H2 or reaction products on the Pt catalyst surface. Two cyclic voltammetry peak potentials were identified and respectively ascribed to reduced acetylene species or CO (0.57 to 0.76 V vs HRE), and adsorbed C2H2 (1.04-1.1 vs HRE). Gas analysis partially confirmed the existence of these species because only C2H2, CO2 and CO were identified and revealed an increase in C2H2 conversion from ~1 to 100 % in the 0.55 to 0.85 V cell voltage range.
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