Abstract
This article discusses the reformate tolerance of three different polymer electrolyte fuel cell (PEFC) anode catalysts, Pt, PtRu, and PtMo. In typical reformate streams, CO is present at ppm levels and has a significant poisoning effect on Pt catalysts, while PtRu and particularly PtMo anodes show improved CO tolerance; CO 2 is present in reformate at percentage levels, and the effects of dilution and/or poisoning can also effect PEFC performance. The mechanisms by which the three different anode catalysts are poisoned by CO and CO 2 are described along with comments on durability and alternative strategies to achieve reformate tolerance such as air bleed and higher temperature operation.
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