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

Pisit Kiatkittikul, Toshiyuki Nohira and Rika Hagiwara
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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

Energies, 2015, vol. 8, issue 6, 1-13

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.

Keywords: ionic liquid; fluorohydrogenate; fuel cell; nonhumidification; polymer; PVdF-HFP (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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