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Uniformity analysis at MEA and stack Levels for a Nexa PEM fuel cell system
Affiliation:1. Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 Bangi UKM, Selangor, Malaysia;2. Centre for Fuel Cell Technology, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), IIT-M Research Park, Chennai, 600113, India;3. Graphene & Advanced 2D Materials Research Group (GAMRG), School of Science and Technology, Sunway University, No. 5, Jalan Universiti, Bandar Sunway, 47500 Subang Jaya, Selangor, Malaysia;4. School of Engineering, Taylor''s University Lakeside Campus, Jalan Taylor''s, Subang Jaya, 47500, Selangor, Malaysia;1. School of Automotive Engineering, The State Key Laboratory of Mechanical Transmissions, Chongqing Automotive Collaborative Innovation Centre, Chongqing University, Chongqing 400044, China;2. School of Automotive Studies, Tongji University, No. 4800 Caoan Road, Shanghai 201804, China;3. China Automotive Technology and Research Center Co., Ltd., Tianjin 300300, China;4. Propulsion Research Institute of Chongqing Changan New Energy Vehicle Technology Co., Ltd, Chongqing 400000, China;1. Department of Materials Science and Engineering, China University of Petroleum (Beijing), Beijing 102249, China;2. Beijing Key Laboratory of Failure, Corrosion and Protection of Oil/gas Facilities, China University of Petroleum (Beijing), Beijing 102249, China;1. Department of Automotive Engineering, School of Transportation Science and Engineering, Beihang University, Beijing, 100191, China;2. Vehicle Energy & Safety Laboratory (VESL), Beihang University, Beijing, 100191, China;3. Department of Mechanical Engineering and Engineering Science, The University of North Carolina at Charlotte, Charlotte, NC, 28223, United States;4. North Carolina Motorsports and Automotive Research Center, The University of North Carolina at Charlotte, Charlotte, NC, 28223, United States
Abstract:The Nexa? power module is evaluated at membrane-electrode-assembly (MEA) and stack levels. The I–V Curves of the Nexa? PEM fuel cell system is measured using periodic current interruption to maintain isothermal stack temperature. The uniformity analysis is mainly performed on the load of 800 W for all MEAs in 10 individual Nexa? stacks. Statistical data show that the MEA voltage without an external load averages 224 mV higher than that with a load of 800 W. The MEA voltage difference is especially pronounced around the two cells at the air compressor side. The average difference is 8.8% and the highest difference is 13.1% between the minimum MEA voltage in the stack and the mean value. This voltage difference reveals a possibility to increase the product power capability and cut the cost per kilowatts by improving the weak performance electrodes or MEAs in the stack.
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