Jeon, Sunyeol Lee, Jisun Rios, Gema M. Kim, Hyoung-Juhn Lee, Sang-Yeop Cho, EunAe Lim, Tae-Hoon Jang, Jong Hyun 2024-01-20T18:34:13Z 2024-01-20T18:34:13Z 2021-09-05 2010-09 0360-3199 https://pubs.kist.re.kr/handle/201004/131146 Membrane-electrode assemblies (MEAs) were fabricated by the decal transfer method with various Nafion ionomer contents (10-40 wt%) and their single cell performance and electrochemical characteristics were examined in atmospheric air at relative humidities of 25-95%. At high humidity (95%), the MEA performance was the highest with a cathode ionomer content of 30 and 20 wt% at 0.6 and 0.4 V, respectively. The optimum ionomer content of the decal MEAs increased with decreasing humidity, because of the change in the oxygen transport rate (water flooding) and number of active sites (ionic resistance). The concentration overpotential gradually increased with relative humidity up to about 0.4 V at 0.8 A/cm(2), which was not considered in previous studies using pressurized air and oxygen. The combined effect of the electrochemical active surface area and ionic resistance of the cathodes on the activation overpotential was also investigated, focusing on intermediate and low humidity levels, using a newly developed impedance analysis method. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD COMPLEX CAPACITANCE ANALYSIS OXYGEN REDUCTION KINETICS GAS-DIFFUSION ELECTRODES CATALYST LAYER NAFION CONTENT AC-IMPEDANCE PLATINUM CARBON TEMPERATURE FABRICATION Effect of ionomer content and relative humidity on polymer electrolyte membrane fuel cell (PEMFC) performance of membrane-electrode assemblies (MEAs) prepared by decal transfer method Article 10.1016/j.ijhydene.2010.06.044 1 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.35, no.18, pp.9678 - 9686 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 35 18 9678 9686 scie scopus 000282347500019 2-s2.0-77956171496 Chemistry, Physical Electrochemistry Energy & Fuels Chemistry Electrochemistry Energy & Fuels Article COMPLEX CAPACITANCE ANALYSIS OXYGEN REDUCTION KINETICS GAS-DIFFUSION ELECTRODES CATALYST LAYER NAFION CONTENT AC-IMPEDANCE PLATINUM CARBON TEMPERATURE FABRICATION Decal transfer method Nafion ionomer Relative humidity Ionic resistance Polymer electrolyte membrane fuel cells (PEMFCs) Membrane-electrode assembly (MEA)