Abstract
Polymer Electrolyte Fuel-Cell (PEFC) systems are being developed at JAXA for applications to transfer vehicles for short-term missions and larger spacecraft in the future. For space applications in a closed environment, we developed a system in which the fuel is perfectly consumed and the oxygen is recycled. We prepared a fuel-cell stack, gas circulator, and dehydrator; combined them; and operated the fuel-cell system without external humidification. Our system concept of the fuel cell operated under the closed environment was verified for 250 hours. We observed the stable average output voltage over 0.75 V while PEFC continuously generated 60 A. We then varied the current level from 30 to 150 A and continued the test for 400 hours. We operated fuel cell system with constant gas circulation rate at the various load level, and observed stable performance of our PEFC system in a closed gas circulation system without external humidification.
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