Effects of platinum loading on the performance of proton exchange membrane fuel cells with high ionomer content in catalyst layers

Sang Hyun Ahn, Sunyeol Jeon, Hee Young Park, Soo Kil Kim, Hyoung Juhn Kim, Eunae Cho, Dirk Henkensmeier, Sung Jong Yoo, Suk Woo Nam, Tae Hoon Lim, Jong Hyun Jang

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24 Citations (Scopus)

Abstract

The effect of Pt loading on the performance of proton exchange membrane fuel cells with atmospheric air feed was evaluated at various relative humidities. The membrane electrode assemblies (MEAs) were fabricated by decal methods with high Nafion ionomer content (30 and 40 wt.%). When the Pt loading was decreased, the performance of the MEAs with an ionomer content of 30 wt.% gradually decreased, mainly due to the insufficient active Pt surfaces with low proton conductivity. With a higher ionomer content of 40 wt.%, the activation overpotential was not significantly increased by the decrease in Pt loading, and the concentration overpotential could be largely reduced by decreasing the Pt loading to 0.25 mg/cm2. When the Pt loading was further decreased to 0.15 mg/cm2, even though the flooding became more severe, the cell performance at 0.6 V and intermediate relative humidity of 55% was about 71.6%, compared to the MEA with a high Pt loading of 0.35 mg/cm2 (ionomer content: 30 wt.%). The cell performance could be further enhanced by decreasing the ionomer content in the anode to enhance the water back diffusion.

Original languageEnglish
Pages (from-to)9826-9834
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number23
DOIs
Publication statusPublished - 2013 Aug 6

Keywords

  • Decal transfer method
  • Electrode thickness
  • Nafion ionomers
  • Platinum loading
  • Proton exchange membrane fuel cells (PEMFC)
  • Relative humidity

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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  • Cite this

    Ahn, S. H., Jeon, S., Park, H. Y., Kim, S. K., Kim, H. J., Cho, E., Henkensmeier, D., Yoo, S. J., Nam, S. W., Lim, T. H., & Jang, J. H. (2013). Effects of platinum loading on the performance of proton exchange membrane fuel cells with high ionomer content in catalyst layers. International Journal of Hydrogen Energy, 38(23), 9826-9834. https://doi.org/10.1016/j.ijhydene.2013.05.123