Phosphoric acid doped imidazolium silane crosslinked poly(epichlorihydrin)/PTFE as high temperature proton exchange membranes

RSC Advances ◽  
2016 ◽  
Vol 6 (66) ◽  
pp. 61029-61036 ◽  
Author(s):  
Jingshuai Yang ◽  
Chao Liu ◽  
Liping Gao ◽  
Jin Wang ◽  
Yixin Xu ◽  
...  
Keyword(s):  
High Temperature ◽  
Phosphoric Acid ◽  
Proton Exchange Membranes ◽  
Proton Exchange

Phosphoric acid doped novel high temperature proton exchange membranes based on the imidazolium functionalized poly(epichlorohydrin) and porous polyetrafluoroethylene were fabricated and investigated.

Macromolecular covalently cross-linked quaternary ammonium poly(ether ether ketone) with polybenzimidazole for anhydrous high temperature proton exchange membranes

2014 ◽  
Vol 5 (17) ◽  
pp. 4939-4947 ◽  
Author(s):  
Na Zhang ◽  
Chengji Zhao ◽  
Wenjia Ma ◽  
Shuang Wang ◽  
Baolong Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Phosphoric Acid ◽  
Quaternary Ammonium ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone ◽  
Improved Performance

The phosphoric acid doped quaternary ammonium poly(ether ether ketone) membranes cross-linked with PBI showed improved performance.

Proton Exchange Membranes Based on Blends of Poly(Benzimidazole) and Butylsulfonated Poly(Beznimidazole) for High Temperature PEMFC

2010 ◽  
Author(s):  
Hsiu-Li Lin ◽  
Chih-Ren Hu ◽  
Po-Hao Su ◽  
Yu-Cheng Chou ◽  
Che-Yu Lin
Keyword(s):  
High Temperature ◽  
Hydrogen Bonds ◽  
Phosphoric Acid ◽  
Doping Level ◽  
Proton Exchange Membrane ◽  
Membrane Electrode Assembly ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Membrane Electrode ◽  
Exchange Membrane

Phosphoric acid doped poly(benzimidazole) (PBI) is one of excellent candidates of proton exchange membranes for high temperature (150–180°C) proton exchange membrane fuel cells (PEMFCs). However, the strong inter-polymer hydrogen bonds cause low elongation and brittleness of PBI membranes. In this work, we synthesize poly(benzimidazole) (PBI) and butylsulfonated poly(benzimidazole) (PBI-BS), in which around 22 mole% of imidazole –NH groups of PBI are grafted with sulfonated butyl groups. We show the elongation, phosphoric acid doping level, and proton conductivity of PBI can be improved by blending ∼ 20 wt% of PBI-BS in the PBI membrane, and the membrane electrode assembly prepared from PBI/PBI-BS (8/2 by wt) blend membrane has a better PEMFC performance at 140°C ∼ 180°C than that prepared from PBI membrane. It is believed that the crosslink interactions of imidazole -NH and -N=C-groups with side chain –C4H8−SO3H groups of PBI-BS reduces the inter-PBI hydrogen bonds and increases the free volume of polymers, which leads to the enhancements of the membrane toughness and phosphoric acid doping level and the PEMFC performance.

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