Effects of cathode channel configurations on the performance of an air-breathing PEMFC |
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| Affiliation: | 1. Mechanical Engineering School, South-West Jiaotong University, Chengdu, Sichuan 610031, China;2. Fuel Cell Research Center, Korea Institute of Energy Research, P.O. Box 103, Yusong, Daejeon 305-343, Republic of Korea;1. Electrochemical Innovation Lab, Department of Chemical Engineering, UCL, London, WC1E 7JE, United Kingdom;2. Intelligent Energy, Charnwood Building, Holywell Park, Ashby Road, Loughborough Leicestershire, LE11 3GB, United Kingdom;1. Department of Energy System Engineering, Atilim University, 06830 Incek, Ankara, Turkey;2. Teksis Ileri Teknolojiler, METU Technopolis, 06800 Ankara, Turkey;3. Chemical Engineering Department, Middle East Technical University, 06531 Ankara, Turkey;1. MERLin, School of Chemical Engineering, The University of New South Wales, NSW, 2052, Australia;2. MERLin, School of Chemistry, University of Sydney, NSW, 2006, Australia;1. Department of Mechanical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Republic of Korea;2. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405, USA;3. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0245, USA;4. Center for Hydrogen & Fuel Cell Research, Korea Institute of Science and Technology, 14-gil 5 Hwarang-ro, Seongbuk-gu, Seoul 02792, Republic of Korea;1. Institute of Thermal Engineering, School of Mechanical Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;2. Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing 100044, China |
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| Abstract: | A mathematical model is developed for evaluating the effects of various channel dimensions on the performance of an air-breathing polymer electrolytes membrane fuel cell (PEMFC). The model, which is based on Nguyen's model, has been extended to include the natural convection to consider buoyancy effect in the channels, electro-chemical reaction in the catalyst layer, and concentration overpotential due to mass transportation limitation. Results from the model indicate that the concentration loss is more serious in natural convection than in forced convection, especially at small channel width, and the performance of air-breathing PEMFC could be improved by increasing the channel width to some extend. Results also show that the temperature, channel size, and air flow rate influence each other, and the performance cannot be improved infinitely by increasing the channel size, and thus the cathode flow field should be optimized. This model provides insights into many design issues of air-breathing fuel cell, and can be easily used as an optimal design tool for air-breathing PEMFC. |
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