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Nonhumidified Fuel Cells Using N -Ethyl- N -methyl-pyrrolidinium Fluorohydrogenate Ionic Liquid-poly(Vinylidene Fluoride-Hexafluoropropylene) Composite Membranes

Author

Listed:
  • Pisit Kiatkittikul

    (Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan)

  • Toshiyuki Nohira

    (Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan)

  • Rika Hagiwara

    (Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan)

Abstract

Composite membranes consisting of N -ethyl- N -methylpyrrolidinium fluoro-hydrogenate (EMPyr(FH) 1.7 F) ionic liquid and poly(vinylidene fluoride hexafluoro-propylene) (PVdF-HFP) copolymer were successfully prepared in weight ratios of 5:5, 6:4, and 7:3 using a casting method. The prepared membranes possessed rough surfaces, which potentially enlarged the three-phase boundary area. The EMPyr(FH) 1.7 F/PVdF-HFP (7:3 weight ratio) composite membrane had an ionic conductivity of 41 mS·cm -1 at 120 °C. For a single cell using this membrane, a maximum power density of 103 mW·cm -2 was observed at 50 °C under non-humidified conditions; this is the highest power output that has ever been reported for fluorohydrogenate fuel cells. However, the cell performance decreased at 80 °C, which was explained by penetration of the softened composite membrane into gas diffusion electrodes to partially plug gas channels in the gas diffusion layers; this was verified by in situ a.c. impedance analysis and cross-sectional SEM images of the membrane electrode assembly.

Suggested Citation

  • Pisit Kiatkittikul & Toshiyuki Nohira & Rika Hagiwara, 2015. "Nonhumidified Fuel Cells Using N -Ethyl- N -methyl-pyrrolidinium Fluorohydrogenate Ionic Liquid-poly(Vinylidene Fluoride-Hexafluoropropylene) Composite Membranes," Energies, MDPI, vol. 8(6), pages 1-13, June.
  • Handle: RePEc:gam:jeners:v:8:y:2015:i:6:p:6202-6214:d:51540
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    Cited by:

    1. Devin Fowler & Vladimir Gurau & Daniel Cox, 2019. "Bridging the Gap between Automated Manufacturing of Fuel Cell Components and Robotic Assembly of Fuel Cell Stacks," Energies, MDPI, vol. 12(19), pages 1-14, September.

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