期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 9, 页码 8969-8980出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c01233
关键词
high-temperature proton exchange membrane; polybenzimidazole; multiple cross-linking; proton-conducting durability; structure stability
资金
- National Natural Science Foundation of China [21776167, 2217020967, 21276148]
- Natural Science Foundation of Shandong Province, China [ZR2019QB012]
- State Key Laboratory of Chemical Engineering (Tianjin University) [SKL-ChE-14B01]
- Zibo City School-City Integration Development Project [2019ZBXC411]
The study utilized a multifunctional proton conductor, TTPSA, to form a high-temperature PEM through multiple cross-linking with CMPEI and mPBI, avoiding leaching and enhancing comprehensive performance.
Increasing the proton-conducting durability and structural stability of acid- doped polybenzimidazole (PBI) proton exchange membranes (PEMs) is helpful for their application at high temperatures. However, these membranes tend to show a high swelling degree and easy leaching of acidic proton conductors. To effectively improve the comprehensive performance of PEMs, a multifunctional and cross-linkable proton conductor (TTPSA) is used to form a high-temperature PEM (HTPEM) by multiple cross-linking with chloromethylated polyetherimide (CMPEI) and mPBI. The CMPEI, as a bridge, is covalently bonded with mPBI and TTPSA to form a monolithic macromolecule. Different from the blending and doping strategy, TTPSA can be firmly immobilized onto the membrane matrix to avoid leaching. Besides, more basic nitrogen sites formed by covalent cross-linking on TTPSA and mPBI can enhance the ionic and hydrogen-bond interactions with -SO3H. Therefore, the resulting mPBI-CMPEI-TTPSA membrane demonstrated excellent overall performance, in terms of oxidative and dimensional stability and fuel crossover resistance. The conductivity of mPBI-CMPEI(20)-TTPSA(30) reached 0.113 and 0.057 S/cm under 100% RH and 50% RH at 180 degrees C, respectively. More importantly, the conductivity almost not changed even after 48 h washing. This research offers a promising approach to the design of HTPEMs.
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