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Energies 2015, 8(6), 6202-6214; doi:10.3390/en8066202

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

1
Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
2
Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan
*
Authors to whom correspondence should be addressed.
Academic Editor: Vladimir Gurau
Received: 5 May 2015 / Revised: 3 June 2015 / Accepted: 16 June 2015 / Published: 23 June 2015
(This article belongs to the Special Issue Polymer Electrolyte Membrane Fuel Cells 2015)
View Full-Text   |   Download PDF [1651 KB, uploaded 23 June 2015]   |  

Abstract

Composite membranes consisting of N-ethyl-N-methylpyrrolidinium fluoro-hydrogenate (EMPyr(FH)1.7F) 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)1.7F/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. View Full-Text
Keywords: ionic liquid; fluorohydrogenate; fuel cell; nonhumidification; polymer; PVdF-HFP ionic liquid; fluorohydrogenate; fuel cell; nonhumidification; polymer; PVdF-HFP
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kiatkittikul, P.; Nohira, T.; Hagiwara, R. Nonhumidified Fuel Cells Using N-Ethyl-N-methyl-pyrrolidinium Fluorohydrogenate Ionic Liquid-poly(Vinylidene Fluoride-Hexafluoropropylene) Composite Membranes. Energies 2015, 8, 6202-6214.

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