Abstract

Hydrogen fuel cell systems (FCSs) represent very promising on-board power generators in hybrid electric vehicles, as they can effectively exploit both the environmental benefits of the fuel and the high efficiency of the electro-chemical device. In this chapter, FCSs based on PEM fuel cell stacks and fuelled by pure hydrogen are described taking into account the specific application in the transportation field. All sub-systems necessary to operate a PEM fuel cell stack (reactant feeding, water and thermal fluxes management) are detailed, evidencing the main design issues to be defined for a reliable working in conditions compatible with vehicular requirements. The role of the auxiliary components in reducing the stack efficiency and dynamic performance of the whole system is discussed, while a brief discussion about expected costs of FCS concludes this chapter.

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