4.8 Article

Novel double cross-linked membrane based on poly (ionic liquid) and polybenzimidazole for high-temperature proton exchange membrane fuel cells

Journal

JOURNAL OF POWER SOURCES
Volume 515, Issue -, Pages -

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ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230637

Keywords

Polybenzimidazole; poly(ionic liquid); Double cross-linked structure; High temperature-proton exchange membranes

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Novel double cross-linked composite membranes were successfully fabricated using diazoniabicyclo-type poly (ionic liquid) with trimethoxysilane groups ([TSPDO]BrCl) and norbornene-type polybenzimidazole (NbPBI). The membranes exhibited enhanced thermal stability, mechanical properties, and proton conductivity, with the NbPBI-TSPDO30 membrane showing the highest proton conductivity at 170 degrees C. Furthermore, the membranes displayed improved PA retention rates under different temperature and humidity conditions.
Novel double cross-linked composite membranes are fabricated based on diazoniabicyclo-type poly (ionic liquid) with trimethoxysilane groups ([TSPDO]BrCl) and norbornene-type polybenzimidazole (NbPBI). During membrane fabrication, in-situ free radical polymerizations and in-situ sol-gel reactions are completed to form the poly (ionic liquid)-NbPBI cross-linked networks and the Si-O-Si networks, respectively. An obvious advantage of this strategy is that the trimethoxysilane groups are fixed by the first cross-linked networks before hydrolysis reaction. Such method can avoid structural defects caused by SiO2 particle aggregation in the membranes. Compared to the pristine NbPBI cross-linked membrane, the NbPBI-TSPDO cross-linked membranes exhibit enhanced thermal stability, mechanical properties, and proton conductivity. Considering the comprehensive performance, the NbPBI-TSPDO30 membrane has the highest proton conductivity of 0.061 S cm- 1 at 170 degrees C under anhydrous conditions. Moreover, NbPBI-TSPDO membranes display an improved PA retention rate of up to 81% and 64% at 160 degrees C for 400 h and 80 degrees C/40% RH for 96 h, respectively.

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