Abstract
Improved CO tolerance in PEM fuel cells was achieved by periodically varying the anodic overvoltage to convert CO to CO2 directly on the anode. The conversion was controlled by a feedback control algorithm, which used current pulsing and time- varying flow rate parameters as the control variables. Single cell performance data was obtained with 1 and 3 percent CO in a synthetic reformate mixture at 50 C using conventional catalysts and a Nafion 115 membrane. Favorable comparisons are made to 20 ppm CO in H2 for conventional operation and to representative DMFC performance. Durability remains a challenge, but preliminary data with less degradation is presented.
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