Lee, Jaeseung Gundu, Mohamed Hassan Lee, Nammin Lim, Kisung Lee, Seung Woo Jang, Seung Soon Kim, Jin Young Ju, Hyunchul 2024-01-19T17:34:27Z 2024-01-19T17:34:27Z 2021-09-05 2020-04-14 0360-3199 https://pubs.kist.re.kr/handle/201004/118729 A novel cathode flow-field design suitable for a passive air-cooled polymer electrolyte membrane (PEM) fuel cell stack is proposed to enhance the water-retaining capability under excess dry air supply conditions. The innovative cathode flow-field is designed to supply more air to the cooling channels and further enables deceleration of the reactant air in the gas channels and acceleration of the coolant air in the cooling channels simultaneously along the air flow path. Therefore, the design facilitates the waste heat removal through the cooling channels while the water removal by the reactant air is minimized. The conceptual cathode flow-field design is validated using a three-dimensional PEM fuel cell model. The detailed simulation results clearly demonstrate that the new cathode flow-field design exhibits superior water-retaining capability compared with a conventional cathode flow-field design (parallel flow channel configuration) under typical air-cooled fuel cell operating conditions. This study provides a new strategy to design cathode flow-fields to alleviate notorious membrane dehydration and unstable performance issues in a passive air-cooled PEM fuel cell stack. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD WATER TRANSPORT PERFORMANCE TEMPERATURE Innovative cathode flow-field design for passive air-cooled polymer electrolyte membrane (PEM) fuel cell stacks Article 10.1016/j.ijhydene.2019.07.128 1 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.45, no.20, pp.11704 - 11713 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 45 20 11704 11713 scie scopus 000524128500029 2-s2.0-85070494599 Chemistry, Physical Electrochemistry Energy & Fuels Chemistry Electrochemistry Energy & Fuels Article WATER TRANSPORT PERFORMANCE TEMPERATURE Passive air-cooled fuel cell Cathode flow-field Membrane dehydration Water transport Heat removal