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

Energies

Pisit Kiatkittikul¹  Toshiyuki Nohira²  Rika Hagiwara¹ 

[1] Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan; E-Mail:;Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan

关键词: ionic liquid;    fluorohydrogenate;    fuel cell;    nonhumidification;    polymer;    PVdF-HFP;   

DOI  :  10.3390/en8066202

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
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