clcctric vehicles, the prevention of any drop in energy conversion efficiency is essential. This is also important in order to create cost reductions to allow for practical mass production. Therefore, controlling the effects of CO is necessary. As for the appropriate approach for the prevention of CO poisoning, the utilization of a combination of methods appears most practical. This combination would include, installation of shifter and/ or CO selective oxidizer to the reformer, reducing the CO concentrations in the reformed gas to a given level, and modification of the PEFC anode electrocatalyst, providing an appropriate level of CO tolerance in the PEFC. In other words, it is vital for successful CO control to establish well-balanced measures in both the reformer and PEFC itself.

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