Phosphoric Acid Loss Mechanism of High Temperature Proton Exchange Membranes

2019 ◽  
Keyword(s):  
High Temperature ◽  
Phosphoric Acid ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Loss Mechanism

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.

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.

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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