Kim, Jae Hong Cho, Eun Ae Jang, Jong Hyun Kim, Hyoung Juhn Lim, Tae Hoon Oh, In Hwan Ko, Jae Jun Oh, Seung Chan 2024-01-20T20:02:46Z 2024-01-20T20:02:46Z 2021-09-05 2010-01 0013-4651 https://pubs.kist.re.kr/handle/201004/131816 This work investigated the effect of cathode inlet relative humidity (RH) on the durability of proton exchange membrane fuel cells (PEMFCs) during startup-shutdown cycling via single-cell experiments. Electrochemical techniques, including measurements of polarization curves, electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and linear sweep voltammetry, were performed to examine the effect of cathode inlet RH on the degradation of PEMFCs. The performance was better for PEMFCs cycled at a lower cathode inlet RH than for those cycled at a higher cathode inlet RH on the order of 0 > 50 > 100%. The CV and EIS results showed that as the cathode inlet RH increased, the loss of electrochemically active surface area and the increase in the charge-transfer resistance (R(ct)) were faster during the startup-shutdown cycling. However, changes in ohmic resistance (R(ohm)) and hydrogen crossover current density were not detectable, revealing that severe membrane degradation did not occur regardless of the cathode inlet RH during startup-shutdown cycles. (C) 2009 The Electrochemical Society. [DOI:10.1149/1.3254170] All rights reserved. English ELECTROCHEMICAL SOC INC FUEL-CELLS CATALYST LAYER PERFORMANCE CARBON DEGRADATION ELECTRODES MECHANISM KINETICS PEFC Effects of Cathode Inlet Relative Humidity on PEMFC Durability during Startup-Shutdown Cycling I. Electrochemical Study Article 10.1149/1.3254170 1 JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.157, no.1, pp.B104 - B112 JOURNAL OF THE ELECTROCHEMICAL SOCIETY 157 1 B104 B112 scie scopus 000272387200032 2-s2.0-72549101396 Electrochemistry Materials Science, Coatings & Films Electrochemistry Materials Science Article FUEL-CELLS CATALYST LAYER PERFORMANCE CARBON DEGRADATION ELECTRODES MECHANISM KINETICS PEFC PEMFC