Jung, Jeawoo Chung, Young-Noon Park, Hee-Young Han, Jonghee Kim, Hyoung-Juhn Henkensmeier, Dirk Yoo, Sung Jong Kim, Jin Young Lee, So Young Song, Kwang Ho Park, Hyun S. Jang, Jong Hyun 2024-01-19T22:04:22Z 2024-01-19T22:04:22Z 2021-09-03 2018-08 0360-3199 https://pubs.kist.re.kr/handle/201004/121123 The effects of varying the applied voltage and relative humidity of feed gases in degradation tests of polymer electrolyte membrane fuel cells (PEMFCs) were analyzed using electrochemical impedance spectroscopy (EIS). A transmission line model that considers the proton-transport resistance in the cathode catalyst layer was used to analyze impedance spectra obtained from degraded PEMFCs. As the applied cell voltage was increased from 1.3 to 1.5 V to induce accelerated degradation, the cell performance decayed significantly due to increased charge- and proton-transfer resistance. The PEMFC degradation was more pronounce at higher relative humidity (RH), i.e. 100% RH, as compared with that observed under 50% RH. Furthermore, changes in the charge transfer resistance of the electrode accompanied changes in the ionic conductivity in the PEMFC catalyst layer. Although the initial ionic and charge-transfer resistances in the catalyst layer were lower under higher RH conditions, the impedance results indicated that the performance degradation was more significant at higher water contents in the electrode due to the consequential carbon corrosion, especially when higher voltages, i.e. 1.5 V, were applied to the PEMFC single cell. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD Electrochemical impedance analysis with transmission line model for accelerated carbon corrosion in polymer electrolyte membrane fuel cells Article 10.1016/j.ijhydene.2018.06.093 1 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.43, no.32, pp.15457 - 15465 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 43 32 15457 15465 N scie scopus 000441854300052 2-s2.0-85049871531 Chemistry, Physical Electrochemistry Energy & Fuels Chemistry Electrochemistry Energy & Fuels Article CATHODE CATALYST LAYER IONIC-CONDUCTIVITY REACTION-KINETICS OXYGEN REDUCTION DEGRADATION SPECTROSCOPY PLATINUM PERFORMANCE ASSEMBLIES RESISTANCE Polymer electrolyte membrane fuel cell Electrochemical impedance spectroscopy Transmission line model Cathode degradation Ionic resistance