The Japan Aerospace Exploration Agency (JAXA) is developing a polymer electrolyte fuel cell (PEFC) system for aerospace missions. A fuel cell stack, gas circulator, and dehydrator were prepared. We combined these components and operated the fuel cell system without external humidification. The performance of the fuel cell was verified for 250 hours while it continuously generated 60 A. We then varied the current level from 30 to 150 A, and continued the test for 400 hours. We did not change gas flow or circulation rate and observed a stable performance by our PEFC system without external humidification.
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