Lee, Sang-Yeop Kim, Sang-Uk Kim, Hyoung-Juhn Jang, Jong Hyun Oh, In-Hwan Cho, Eun Ae Hong, Seong-Ahn Ko, Jaejun Lim, Tae-Won Lee, Kwan-Young Lim, Tae-Hoon 2024-01-20T23:03:54Z 2024-01-20T23:03:54Z 2021-09-03 2008-06-01 0378-7753 https://pubs.kist.re.kr/handle/201004/133401 Water removal from proton exchange membrane fuel cells (PEMFC) is of great importance to improve start-up ability and mitigate cell degradation when the fuel cell operates at subfreezing temperatures. In this study, we report water removal characteristics under various shut down conditions including a dry gas-purging step. In order to estimate the dehydration level of the electrolyte membrane, the high frequency resistance of the fuel cell stack was observed. Also, a novel method for measuring the amount of residual water in the fuel cell was developed to determine the amount of water removal. The method used the phase change of liquid water and was successfully applied to examine the water removal characteristics. Based on these works, the effects of several parameters such as purging time, flow rate of purging gas, operation current, and stack temperature on the amount of residual water were investigated. (C) 2008 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV REPETITIVELY BROUGHT BIPOLAR PLATE DEGRADATION TEMPERATURES PERFORMANCE PEMFCS MODEL Water removal characteristics of proton exchange membrane fuel cells using a dry gas purging method Article 10.1016/j.jpowsour.2008.01.009 1 JOURNAL OF POWER SOURCES, v.180, no.2, pp.784 - 790 JOURNAL OF POWER SOURCES 180 2 784 790 scie scopus 000256392700015 2-s2.0-43049125787 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article REPETITIVELY BROUGHT BIPOLAR PLATE DEGRADATION TEMPERATURES PERFORMANCE PEMFCS MODEL cold start-up dry gas purging freeze-thaw cycles proton exchange membrane fuel cell (PEMFC)