The effects of Nafion ionomer content in PEMFC MEAs prepared by a catalyst-coated membrane (CCM) spraying method |
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Authors: | Kun-Ho Kim Kwan-Young Lee Hyoung-Juhn Kim EunAe Cho Sang-Yeop Lee Tae-Hoon Lim Sung Pil Yoon In Chul Hwang Jong Hyun Jang |
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Affiliation: | 1. Center for Fuel Cell Research, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea;2. Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Republic of Korea;3. Corporate Research and Development Division, Hyundai-Kia Motors, Gyeonggi-do 446-912, Republic of Korea |
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Abstract: | We analyzed the effects of ionomer content on the proton exchange membrane fuel cell (PEMFC) performance of membrane electrode assemblies (MEAs) fabricated by a catalyst-coated membrane (CCM) spraying method in partially humidified atmospheric air and hydrogen. When high loading Pt/C catalysts (45.5 wt.%) were used, we observed that catalytic activity was not directly proportional to electrochemical active surface area (EAS). This suggests that ionic conductivity through ionomers in catalyst layers is also an important factor affecting MEA performance. In addition, the effects of mass transport were experimentally evaluated by manipulating the air stoichiometry ratio at the cathodes. MEA performance was more sensitive to flow rates under conditions of higher ionomer content. Due to the combined effect of EAS, ionic conductivity, and mass transfer characteristics (all of which varied according to the ionomer content), an MEA with 30 wt.% ionomer content at the cathode (25 wt.% at the anode) was shown to yield the best performance. |
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Keywords: | Catalyst-coated membrane (CCM) spraying method Nafion ionomer Polymer electrolyte membrane fuel cells (PEMFC) Membrane-electrode assembly (MEA) Ionic resistance |
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