Numerical study for in-plane gradient effects of cathode gas diffusion layer on PEMFC under low humidity condition |
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| Affiliation: | 1. Department of Climate Change Energy Engineering, Yonsei University, Seoul, 03722, South Korea;2. Blue Economy Strategy Institute Co. Ltd., Focus Building, 23-13, Hyoryeong-ro, 60-gil, Seocho-gu, Seoul, 06721, South Korea;3. Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, 03722, South Korea;4. Department of Mechanical Engineering, Seoul National University, Seoul, 08826, South Korea;5. Mechanical Engineering Department, Chung-Ang University, Seoul, 06974, South Korea;1. Tianjin Key Lab of Refrigeration Technology, Tianjin University of Commerce, Tianjin 300134, China;2. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, MOE, Tianjin University, Tianjin 300350, China;3. Department of Hydrogen Energy Systems, Graduate School of Engineering, Kyushu University, Fukuoka 819-0395, Japan;1. Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong University, Shanghai 200240, PR China;2. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, PR China;3. Shanghai Zhizhen New Energy Equipment Co., Ltd., Shanghai 201306, PR China;1. State Key Laboratory of Engines, Tianjin University, Tianjin, 300350, China;2. Chongqing Chang''an New Energy Automobile Technology Co. Ltd., Chongqing, 401120, China;1. Department of Mechanical Engineering, Seoul National University, Seoul, 08826, Republic of Korea;2. Department of Clean Fuel & Power Generation, Korea Institute of Machinery and Materials, Daejeon, 34103, Republic of Korea |
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| Abstract: | A numerical study about in-plane porosity and contact angle gradient effects of cathode gas diffusion layer (GDL) on polymer electrolyte membrane fuel cell (PEMFC) under low humidity condition below 50% relative humidity is performed in this work. Firstly, a numerical model for a fuel cell is developed, which considers mass transfer, electrochemical reaction, and water saturation in cathode GDL. For water saturation in cathode GDL, porosity and contact angle of GDL are also considered in developing the model. Secondly, current density distribution in PEMFC with uniform cathode GDL is scrutinized to design the gradient cathode GDL. Finally, current density distributions in PEMFC with gradient cathode GDL and uniform cathode GDL are compared. At the gas inlet side, the current density is higher in GDL with a gradient than GDL with high porosity and large contact angle. At the outlet side, the current density is higher in GDL with a gradient than GDL with low porosity and small contact angle. As a result, gradient cathode GDL increases the maximum power by 9% than GDL with low porosity and small contact angle. Moreover, gradient cathode GDL uniformizes the current density distribution by 4% than GDL with high porosity and large contact angle. |
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| Keywords: | PEMFC (Polymer electrolyte membrane fuel cell) GDL (Gas diffusion layer) Current density distribution In-plane gradient |
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