Soluble ultra-high molecular weight poly (4,4′-diphenylether-5,5′-bibenzimidazole) based membranes with remarkable mechanical strength and specific proton conductivity for high temperature proton exchange membrane fuel cells

被引:9
作者
Liu, Guoliang [1 ]
Wang, Ailian [3 ]
Ji, Wenxi [3 ]
Zhang, Longgui [3 ]
Wu, Jianing [3 ]
Zhang, Taoyi [3 ]
Tang, Haolin [1 ,2 ,4 ]
Zhang, Haining [1 ,2 ,4 ]
机构
[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, 122 Luoshi Rd, Wuhan 430070, Peoples R China
[2] Guangdong Lab, Foshan Xianhu Lab Adv Energy Sci & Technol, Foshan 528200, Peoples R China
[3] Sinopec Beijing Res Inst Chem Ind Co Ltd, Beijing 100013, Peoples R China
[4] Wuhan Univ Technol, Hubei Key Lab Fuel Cell Technol, Wuhan 430070, Peoples R China
关键词
Poly(4,4 ' -diphenylether-5,5 ' -bibenzimidazole); Ultra-high molecular weight; Mechanical strength; Specific proton conductivity; High-temperature proton exchange membrane; fuel cell; POLYBENZIMIDAZOLE MEMBRANES; ELECTROLYTE MEMBRANE; PBI; ENHANCEMENT; PERFORMANCE;
D O I
10.1016/j.memsci.2023.122348
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Reducing the thickness of membrane electrolyte is one important direction to improve Ohmic polarization and the according performance of high-temperature proton exchange membrane fuel cells for its widespread applications. Herein, we report that robust thin membranes can be formed using a soluble ether-contained poly(4,4 '-diphenylether-5,5 '-bibenzimidazole) with an ultra-high molecular weight of 170 kDa. Due to the enhanced chain entanglement of high molecular weight polymers, the formed thin membrane exhibits promising mechanical strength, thermal and oxidation stability. The optimized membrane with thickness of 61 mu m and phosphoric acid uptake of 606 wt% has the high specific proton conductivity of 25.9 S cm(-2) at 160 degrees C under anhydrous conditions and mechanical strength of 11.2 MPa. The accordingly fabricated membrane electrode assembly delivers a peak power density of 0.544 W cm(-2) with the open circuit voltage of 0.915 V at 160 degrees C using air as oxidant, outperforming the value of 0.522 W cm(-2) for the commercial membrane electrode assembly with thickness of 250 mu m and phosphoric acid uptake of 1018 wt%.
引用
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页数:10
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