Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 565, Issue -, Pages 281-292Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2018.08.037
Keywords
Post-modified metal-organic framework; Sulfonated poly(ether sulfone); High temperature proton exchange membrane; Porous membrane; Long-term durability; Covalent cross-linking
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Funding
- Research Affairs Division of Isfahan University of Technology (IUT), Isfahan
- Renewable Energy Organization of Iran (REOI)
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A proton-conducting sulfonated poly(ether sulfone)-metal-organic framework membrane with high proton conductivity at high temperature and anhydrous conditions was synthesized by anchoring the Cr-MIL-101-NH2 to the aromatic polymer backbone via a Hinsberg reaction. The effect of metal-organic frameworks as the pendant porous aminated moieties on membrane features such as water uptake, swelling ratio, mechanical, oxidative and thermal stabilities, morphology, acid retention capacity, ion exchange capacity, long-term durability, hydrogen crossover, proton conductivity and fuel cell performance was methodically studied. The presence of holes and -NH2 groups in the metal-organic frameworks structure enhanced the acid retention capacity of the sulfonated poly(ether sulfone)-metal-organic framework membrane. This behavior resulted in the satisfactory performance of the membrane at high temperatures and low humidity (the proton conductivity of the membrane was increased to 0.041 S cm(-1) (as compared to Nafion = 0.003 S cm(-1)) at 160 degrees C). Moreover, the crosslinking process which produced by metal-organic frameworks increased the dimensional stability (the swelling ratio was reduced from 57% to 4%), oxidative resistance, tensile strength, water uptake, and hydrogen crossover of the polymer.
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