4.8 Article

Integration of a high oxygen permeability ionomer into polymer electrolyte membrane fuel cell cathodes for high efficiency and power density

期刊

JOURNAL OF POWER SOURCES
卷 522, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230821

关键词

High oxygen permeability ionomer (HOPI); Oxygen solubility; Oxygen transport resistance; Cathode catalyst layer; Polymer electrolyte membrane fuel cell

资金

  1. U.S. Department of En-ergy, Office of Energy Efficiency and Renewable Energy [DE-0008822]
  2. U.S. DOE Energy Efficiency and Renewable Energy, Hydrogen and Fuel Cell Technologies Office through the Million Mile Fuel Cell Truck (M2FCT) , United States consortium [DE-AC02-06CH11357]
  3. U.S. DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory
  4. agency of the United States Government

向作者/读者索取更多资源

This study focuses on the integration of a high oxygen permeability ionomer with high durability carbon supported platinum catalysts for the preparation of cathode catalyst layers in PEMFCs. The results show that this integration leads to significant improvements in specific activities at low current densities and reduced oxygen transport resistances at high current densities. This integration has the potential to enhance the efficiency and peak power density of PEMFCs.
In this work, we present a study on the integration of a high oxygen permeability ionomer (HOPI) with high durability carbon supported platinum (Pt/C) catalysts to prepare cathode catalyst layers (CCLs) for polymer electrolyte membrane fuel cells (PEMFCs). A key motivation is the production of PEMFCs with high efficiency and durability for heavy-duty fuel cell vehicles. Our results from integrating a pre-commercial HOPI with robust, state-of-the-art catalysts with medium and low surface area carbon supports show significant increases in specific activities (67% increase over the standard commercial ionomer) at low current densities and reduced oxygen (O-2) transport resistances (R-O2's) at high current densities, enabling both higher efficiency and peak power density. The reduction in the RO2 with the HOPI is most significant at low relative humidity (RH), due to its more rigid backbone structure resisting compaction at lower water contents. In our ink optimization analysis, we show that the HOPI in this study achieves its peak performance with an ionomer to carbon ratio (I/C) of 0.6 and a moderately alcohol-rich ink solvent when fabricating catalyst layers by the decal method with an automatic wet film coater.

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