Cold-start characteristics of polymer electrolyte fuel cells [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 621.812 Power and speed control devices
• Thông tin xuất bản: Los Alamos, N.M. : Oak Ridge, Tenn. : Los Alamos National Laboratory ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2010
• Mô tả vật lý: Medium: ED : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 257032
• Chủ đề: 1. 30; 2. 36; 3. Et al; 4. Evaluation; 5. Heat transfer; 6. Ionic conductivity; 7. Membranes; 8. Neutrons; 9. Performance; 10. Proton exchange membrane fuel cells; 11. Reaction kinetics

Tóm tắt

In this paper, we investigate the electrochemical reaction kinetics, species transport, and solid water dynamics in a polymer electrolyte fuel cell (PEFC) during cold start. A simplitied analysis is developed to enable the evaluation of the impact of ice volume fraction on cell performance during coldstart. Supporting neutron imaging data are also provided to reveal the real-time water evolution. Temperature-dependent voltage changes due to the reaction kinetics and ohmic loss are also analyzed based on the ionic conductivity of the membrane at subfreezing temperature. The analysis is valuable for the fundamental study of PEFC cold-start.