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Title: Nonhumidified Fuel Cells Using N-Ethyl-N-methyl-pyrrolidinium Fluorohydrogenate Ionic Liquid-poly(Vinylidene Fluoride-Hexafluoropropylene) Composite Membranes
Authors: Kiatkittikul, Pisit
Nohira, Toshiyuki  kyouindb  KAKEN_id
Hagiwara, Rika
Author's alias: 野平, 俊之
Keywords: ionic liquid
fluorohydrogenate
fuel cell
nonhumidification
polymer
PVdF-HFP
Issue Date: Jun-2015
Publisher: MDPI
Journal title: Energies
Volume: 8
Issue: 6
Start page: 6202
End page: 6214
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.
Rights: This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
URI: http://hdl.handle.net/2433/202590
DOI(Published Version): 10.3390/en8066202
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