Cho, Min Kyung Park, Hee-Young Lee, So Young Lee, Byung-Seok Kim, Hyoung-Juhn Henkensmeier, Dirk Yoo, Sung Jong Kim, Jin Young Han, Jonghee Park, Hyun S. Sung, Yung-Eun Jang, Jong Hyun 2024-01-20T02:32:44Z 2024-01-20T02:32:44Z 2021-09-05 2017-01 0013-4686 https://pubs.kist.re.kr/handle/201004/123267 For intermediate-temperature polymer electrolyte membrane fuel cells (IT-PEMFCs), the effects of the cathode gas flow rate and the ionomer content are experimentally examined at 120 degrees C under conditions of low relative humidity (RH). The IT-PEMFC operation at low RH should be beneficial in developing compact systems with smaller humidifiers. First, analysis of the effect of gas flow rate at various current densities confirms that drying of the membrane electrode assembly (MEA) is an important factor in IT-PEMFC operation, whereas cathode flooding becomes significant in regions of high current density with low flow rates. Then, MEAs with various contents of Aquivion (TM) ionomer are fabricated, and the combined effect of drying and flooding is further investigated by IT-PEMFC tests at various RH conditions and current densities. The optimum ionomer content increases with decreasing current density at 20% RH or below, indicating that MEA drying becomes dominant over cathode flooding. (C) 2016 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD Effect of Catalyst Layer Ionomer Content on Performance of Intermediate Temperature Proton Exchange Membrane Fuel Cells (IT-PEMFCs) under Reduced Humidity Conditions Article 10.1016/j.electacta.2016.12.009 1 ELECTROCHIMICA ACTA, v.224, pp.228 - 234 ELECTROCHIMICA ACTA 224 228 234 N scie scopus 000392165800028 2-s2.0-85006293479 Electrochemistry Electrochemistry Article PERFLUOROSULFONIC ACID IONOMERS RELATIVE-HUMIDITY COMPOSITE MEMBRANES NAFION CONTENT MEAS COPOLYMERS DEPENDENCE RESISTANCE OPERATION TRANSPORT Intermediate-temperature polymer electrolyte membrane fuel cell Membrane electrode assembly Drying Relative humidity Gas flow rate