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It is necessary to keep the electrolyte membrane moistened to maintain the high conductivity of hydrogen ions.
For this purpose, the fuel and air are first humidified.
The PEFC is operated at temperatures below 100˚C. For this reason, water produced by humidification and power generation accumulate inside in the liquid state, preventing gas from reaching the catalyst layer sufficiently. To solve this problem, the surfaces of part of the component materials are treated to repel water so that water is discharged efficiently.