Abstract
Optimum air bleed level was selected based on both voltage decay rate and fluoride release rate from the endurance tests. Reverse water-gas shift reaction was found to be negligible for a standard proton exchange membrane fuel cell with a Pt-Ru anode. The effect of transient high CO was investigated. It was found that a fuel cell suffered a recoverable voltage loss without long term adversary effect when it was exposed to transient high CO (20 to 200 ppm) for a short period of time. However, fuel cells suffered a permanent loss in CO mitigation capability when they were exposed to high CO for hours. This was attributed to the formation of RuOx as a result of high anode overpotential.
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