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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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