Enhanced proton conductivity from phosphoric acid-incorporated 3D polyacrylamide-graft-starch hydrogel materials for high-temperature proton exchange membranes

2014 ◽  
Vol 131 (16) ◽  
pp. n/a-n/a ◽  
Author(s):  
Qi Qin ◽  
Qunwei Tang ◽  
Benlin He ◽  
Haiyan Chen ◽  
Shuangshuang Yuan ◽  
...  
Keyword(s):  
High Temperature ◽  
Phosphoric Acid ◽  
Proton Conductivity ◽  
Proton Exchange Membranes ◽  
Proton Exchange

scholarly journals Synthesis and Properties of Phosphoric-Acid-Doped Polybenzimidazole with Hyperbranched Cross-Linkers Decorated with Imidazolium Groups as High-Temperature Proton Exchange Membranes

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 515 ◽  
Author(s):  
Chunmei Gao ◽  
Meishao Hu ◽  
Li Wang ◽  
Lei Wang
Keyword(s):  
High Temperature ◽  
Phosphoric Acid ◽  
Proton Conductivity ◽  
Proton Exchange Membrane ◽  
Mechanical Performance ◽  
Weak Interactions ◽  
Weight Ratio ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Hydrogen Bond Formation

Highly phosphoric-acid (PA)-doped polybenzimidazole (PBI) membranes exhibit good proton conductivity at high temperatures; however, they suffer from reduced mechanical properties and loss of PA molecules due to the plasticity of PA and the weak interactions between PA and benzimidazoles, especially with the absorption of water. In this work, a series of PBIs with hyperbranched cross-linkers decorated with imidazolium groups (ImOPBI-x, where x is the weight ratio of the hyperbranched cross-linker) as high-temperature proton exchange membranes are designed and synthesized for the first time. We observe how the hyperbranched cross-linkers can endow the membranes with improved oxidative stability and acceptable mechanical performance, and imidazolium groups with strong basicity can stabilize the PA molecules by delocalization and hydrogen bond formation to endow the membranes with an enhanced proton conductivity and a decreased loss of PA molecules. We measured a high proton conductivity of the ImOPBI-x membranes, ranging from 0.058 to 0.089 S cm−1 at 160 °C. In addition, all the ImOPBI-x membranes displayed good mechanical and oxidative properties. At 160 °C, a fuel cell based on the ImOPBI-5 membrane showed a power density of 638 mW cm−2 and good durability under a hydrogen/oxygen atmosphere, indicating its promising use in anhydrous proton exchange membrane applications.

Novel PA-doped polybenzimidazole membranes with high doping level, high proton conductivity and high stability for HT-PEMFCs

RSC Advances ◽  
2015 ◽  
Vol 5 (66) ◽  
pp. 53870-53873 ◽  
Author(s):  
Xiaobai Li ◽  
Hongwei Ma ◽  
Hailong Wang ◽  
Shitong Zhang ◽  
Zhenhua Jiang ◽  
...  
Keyword(s):  
High Temperature ◽  
Phosphoric Acid ◽  
Proton Conductivity ◽  
Doping Level ◽  
High Stability ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
High Proton Conductivity ◽  
High Doping Level ◽  
High Proton

This work outlines polybenzimidazole-based high temperature proton exchange membranes with a high phosphoric acid-doping level, high proton conductivity and high stability.

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.

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