| 摘要 |
A fuel cell includes a membrane electrode assembly ( 46 ) having a first reactant flow field ( 80 ) secured adjacent a first or second surface ( 48, 50 ) of the assembly ( 46 ) for directing flow of a first reactant adjacent the first or second surface of the assembly ( 46 ). The first reactant flow field ( 80 ) defines a plurality of two-pass circuits ( 82, 84, 86, 88 ), and each two-pass circuit ( 82 ) is in fluid communication with both a first reactant inlet ( 90 ) for directing the first reactant into the fuel cell ( 12 ), and with a first reactant outlet ( 92 ) for directing the first reactant out of the fuel cell ( 12 ). The plurality of two-pass circuits ( 82 ) facilitate water movement ( 112 ) toward the reactant inlet ( 90 ) to aid in passive maintenance of fuel cell ( 12 ) water balance.
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