Eom, KwangSup Cho, EunAe Nam, Suk-Woo Lim, Tae-Hoon Jang, Jong Hyun Kim, Hyoung-Juhn Hong, Bo Ki Yang, Yoo Chang 2024-01-20T14:02:22Z 2024-01-20T14:02:22Z 2021-09-04 2012-09-01 0013-4686 https://pubs.kist.re.kr/handle/201004/128881 To examine durability of metallic bipolar plates (Bps) under reverse current conditions, the degradation of PEMFC employing graphite, bare 316L, and CrN-coated 316L BPs is investigated via a 1.4V pulse cycling test. After 20 cycles, the average voltage decay rate at 160 mA cm(-2) is 6.8, 16.8, and 12.0 mV cycle(-1) for the single cell using graphite, bare 316L, and CrN-coated 316L BPs, respectively. SEM, EPMA, and TEM analyses of the cathodes that experienced an extraordinary high voltage of 1.4 V show that carbon corrosion and Pt migration/agglomeration occur similarly for the single cells, irrespective of the bipolar plate material. In contrast, in the membrane tested with bare 316L and CrN-coated 316L, Fe and Cr are detected; the amounts of Fe and Cr in the membrane are higher for bare 316L than for CrN-coated 316L. The membrane contamination results in a decrease in the ionic conductivity of the membranes, which mainly contributes to the faster performance decay of the single cells employing bare 316L and CrN-coated 316L bipolar plates. Thus, if automotive PEMFCs using metallic BPs are exposed to reverse current conditions upon start/stop cycles, metal contamination of the membrane could accelerate the performance decay in addition to the cathode degradation, such as carbon corrosion and Pt migration/agglomeration. (C) 2012 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD OXYGEN PARTIAL-PRESSURE STAINLESS-STEEL CORROSION BEHAVIOR PEMFC DURABILITY CATHODE CONDUCTIVITY ENVIRONMENT MECHANISM HYDROGEN Degradation behavior of a polymer electrolyte membrane fuel cell employing metallic bipolar plates under reverse current condition Article 10.1016/j.electacta.2012.06.024 1 ELECTROCHIMICA ACTA, v.78, pp.324 - 330 ELECTROCHIMICA ACTA 78 324 330 scie scopus 000308259500043 2-s2.0-84864283265 Electrochemistry Electrochemistry Article OXYGEN PARTIAL-PRESSURE STAINLESS-STEEL CORROSION BEHAVIOR PEMFC DURABILITY CATHODE CONDUCTIVITY ENVIRONMENT MECHANISM HYDROGEN Polymer electrolyte membrane fuel cell Bipolar plate Degradation 1.4 V pulse cycling Stainless steel bipolar plate