Non-uniform agglomerate cathode catalyst layer model on the performance of PEMFC with consideration of water effect |
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| Affiliation: | 1. School of Energy Science and Engineering, Central South University, Changsha, Hunan 410083, China;2. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, IL 61801, USA;1. Jordan University of Science and Technology, Department of Chemical Engineering, Box 3030, Irbid 22110, Jordan;2. Sultan Qaboos University, Department of Petroleum and Chemical Engineering, Box 33, P.C 123, Muscat Oman;1. Department of Electrical Engineering, Kermanshah University of Technology, Kermanshah, Iran;2. Electrical Engineering Faculty, Sahand University of Technology, Tabriz, Iran;1. School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;2. Innovation and Technology Department, GE Grid Solution, Stafford, ST17 4LX, UK;1. Research Unit: Industrial Systems Study and Renewable Energy (ESIER), National Engineering School of Monastir (ENIM), University of Monastir, Tunisia;2. Artois University, EA4025, Laboratory of Electrical Systems and Environment (LSEE), Bethune, F-62400, France;1. School of Resource and Environmental Engineering, Anhui University, Hefei 230601, China;2. CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China |
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| Abstract: | We focus on the effect of cathode catalyst layer physical structure on the cell performance of proton exchange membrane fuel cell (PEMFC). At low polarization, high inlet humidification predicts better cell performance because of the more active surface in the CL. As polarization is extended near the mass transfer limited regime, high humidification only renders a flooded electrode and inferior cell performance. Catalyst layer with better capillary water transport parameters performs better than that with inferior water repulsion capability. Permeation in the gas diffusion layer (GDL) is important for efficient oxygen diffusion in mass transfer influenced regime. On the other hand, the permeability in catalyst layer only has secondary effect.The distribution of material properties in the CL is studied for the MEA fabrication strategy. The CL is divided into three sub-layers with changing material properties. With water effect considered, better performance is obtained for higher porosity near the GDL, higher electrolyte fraction in the agglomerate near the membrane. The effect of agglomerate particle size differs in the ohmic and mass transfer controlled regimes. Larger agglomerate size near GDL is preferred in the ohmic limited regime, while smaller size near GDL performs better if operated at mass transfer controlled regime. |
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| Keywords: | PEMFC MEA Non-uniform catalyst layer Agglomerate model Liquid saturation Water content |
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