The Japan Aerospace Exploration Agency (JAXA) isdeveloping a polymer electrolyte fuel cell (PEFC)system for aerospace missions. A fuel cell stack, gascirculator, and dehydrator were prepared. Wecombined these components and operated the fuel cellsystem without external humidification. Theperformance of the fuel cell was verified for 250 hourswhile it continuously generated 60 A. We then variedthe current level from 30 to 150 A, and continued thetest for 400 hours. We did not change gas flow orcirculation rate and observed a stable performance byour PEFC system without external humidification.
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