A new flow field design for polymer electrolyte-based fuel cells |
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| Affiliation: | 1. Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India;2. Department of Energy Technology, Aalborg University, Pontoppidanstraede 101, Denmark;1. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong Special Administrative Region, China;2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;3. Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong Special Administrative Region, China;1. Institute of Engineering Thermophysics and New Energy, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, Sichuan, China;2. Shenzhen Key Laboratory of New Lithium-ion Batteries and Mesoporous Materials, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, China;1. Department of Mechanical Engineering, Kun Shan University, No. 949, Da Wan Rd., Yung-Kang City, Tainan Hsien 710, Taiwan, ROC;2. Department of Systems and Naval Mechatronic Engineering, National Cheng Kung University, Tainan, Taiwan, ROC;3. Advanced Technology Division, Shun On Electronic Company Limited, Hsinchu, Taiwan, ROC |
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| Abstract: | ![]()
We present a new flow field design, termed convection-enhanced serpentine flow field (CESFF), for polymer electrolyte-based fuel cells, which was obtained by re-patterning conventional single serpentine flow fields. We show theoretically that the CESFF induces larger pressure differences between adjacent flow channels over the entire electrode surface than does the conventional flow field, thereby enhancing in-plane forced flow through the electrode porous layer. This characteristic increases mass transport rates of reactants and products to and from the catalyst layer and reduces the amount of liquid water that is entrapped in the porous electrode, thereby minimizing electrode flooding over the entire electrode surface. We applied this new flow field to a single direct methanol fuel cell and demonstrated experimentally that the new flow field resulted in substantial improvements in both cell performance and operating stability as opposed to the conventional serpentine flow field design. |
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