Kim, Kun-Ho Lee, Kwan-Young Lee, Sang-Yeop Cho, EunAe Lim, Tae-Hoon Kim, Hyoung-Juhn Yoon, Sung Pil Kim, Sae Hoon Lim, Tae Won Jang, Jong Hyun 2024-01-20T18:03:57Z 2024-01-20T18:03:57Z 2021-09-04 2010-12 0360-3199 https://pubs.kist.re.kr/handle/201004/130897 For PEMFC operation water management is very important to provide both sufficient proton conductivity and mass transport Therefore in this study the effect of the relative humidity (38-87%) on cell performance is examined for PEMFC MEAs with various Nafion ionomer contents The MEAs were fabricated using a CCM (catalyst coated membrane) spraying method As the relative humidity of the cathodes (RHC) increases the cell volt ages at 04 and 1 2 A/cm(2) increased for a MEA with 20 wt% ionomer This can be explained in terms of the expansion of active sites with enhanced ionic conductivity (activation overpotential) In contrast with a higher RHC value the cell voltages for 35 wt% ionomer (more hydrophilic) gradually decreased as a result of slower gas transport (concentration overpotential) For MEAs with intermediate ionomer contents 25 and 30 wt%, the cell voltages at 04 A/cm2 showed maximum values at a RHC of 67% at which point the mass transport begins to be the more dominant factor The highest unit cell performance was observed in a MEA with an ionomer content of 25 wt% at a RHC of 59% and in a MEA at 20 wt% ionomer content at a higher humidity of 87% (C) 2010 Professor T Nejat Veziroglu Published by Elsevier Ltd All rights reserved English PERGAMON-ELSEVIER SCIENCE LTD ELECTROLYTE FUEL-CELLS CATALYST LAYER MEMBRANE WATER KINETICS The effects of relative humidity on the performances of PEMFC MEAs with various Nafion (R) ionomer contents Article 10.1016/j.ijhydene.2010.04.082 1 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.35, no.23, pp.13104 - 13110 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 35 23 13104 13110 scie scopus 000284743900053 2-s2.0-78049453756 Chemistry, Physical Electrochemistry Energy & Fuels Chemistry Electrochemistry Energy & Fuels Article; Proceedings Paper ELECTROLYTE FUEL-CELLS CATALYST LAYER MEMBRANE WATER KINETICS PEMFC (polymer electrolyte membrane fuel cell) MEA (membrane electrode assembly) Relative humidity Nafion (R) ionomer CCM (catalyst coated membrane) spraying method