Jo, Yoo Yeon Cho, EunAe Kim, Jung Hyeun Lim, Tae-Hoon Oh, In-Hwan Kim, Soo-Kil Kim, Hyung-Juhn Jang, Jong Hyun 2024-01-20T15:35:05Z 2024-01-20T15:35:05Z 2021-09-05 2011-12-01 0378-7753 https://pubs.kist.re.kr/handle/201004/129726 Effects of operating temperature on performance degradation of polymer electrolyte membrane fuel cells (PEMFCs) were investigated under the repetitive startup/shutdown cycling operation that induced the so-called 'reverse current condition'. With repeating the startup/shutdown cycle, polarization curves, electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), linear sweep voltammetry (LSV) were measured to examine in situ electrochemical degradation of the MEAs. To investigate physicochemical degradation of the MEAs, scanning electron microscopy (SEM), electron probe micro analysis (EPMA), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR) were employed before and after the startup/shutdown cycling operation. With increasing operating temperature from 40 to 65 and 80 degrees C under the repetitive reverse-current condition, the cell performance decayed faster since corrosion of the carbon support and dissolution/migration/agglomeration of Pt catalyst were accelerated resulting in increases in ohmic and charge transfer resistance and loss of EAS. (C) 2011 Elsevier B.V. All rights reserved. English ELSEVIER INLET RELATIVE-HUMIDITY CARBON CORROSION PEMFC DURABILITY CATALYST DAMAGE Degradation of polymer electrolyte membrane fuel cells repetitively exposed to reverse current condition under different temperature Article 10.1016/j.jpowsour.2011.08.035 1 JOURNAL OF POWER SOURCES, v.196, no.23, pp.9906 - 9915 JOURNAL OF POWER SOURCES 196 23 9906 9915 scie scopus 000296216600009 2-s2.0-80053564606 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article INLET RELATIVE-HUMIDITY CARBON CORROSION PEMFC DURABILITY CATALYST DAMAGE Polymer electrolyte membrane fuel cells Operating temperature Startup/shutdown cycle Carbon corrosion Durability