Microwatt Fuel Cell for Long-Term and Wide Ambient Temperature Range Operation [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 660.6 Biotechnology
• Thông tin xuất bản: Washington, D.C : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of the Assistant Secretary for Defense Programs ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2018
• Mô tả vật lý: Size: p. 233-244 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 256247
• Chủ đề: 1. 08 hydrogen; 2. 30 direct energy conversion; 3. Fuel cell; 4. Microwatt

Tóm tắt

 A small microwatt fuel cell stack and system was designed, fabricated, and tested for passive operation with pure H<
 sub>
 2<
 /sub>
  and O<
 sub>
 2<
 /sub>
  to provide continuous power for multiple decades with uncontrolled fluctuating ambient conditions. The stack was designed to operate with dead ended gas flows with water removal via passive membrane diffusion to notches in the bipolar plates. Additional requirements for decades long operation is minimizing H<
 sub>
 2<
 /sub>
  and O<
 sub>
 2<
 /sub>
  consumption, specifically membrane cross-over
  to minimize cross-over, stacks were built with layered membranes of 100 �m and 400 �m. Here, the stack spatial water concentration level was monitored during operation by in situ neutron imaging to evaluate the passive water management design. Operation was verified by testing at temperatures ranging from -55 �C to 80 �C, including periodic pulses in power.