In order to develop anion exchange membranes (AEMs) with simutaneously good anion conductivity
low vanadium ion permeability
excellent mechanical property
and high chemical stability
a fluorinated poly-(arylene ether) (FPAE) containing tertiary amine groups was condensation polymerized and then cross-linked with decabromopropyl pillar[5
]
arene (P5Br)
via
the nucleophilic substitution reaction. After that
iodomethane was introduced to convert the remaining tertiary amine g
roups into quaternary ammonium groups. A series of densely cross-linked FPAE AEMs
namely QAFPAE-P5Br-
x
were prepared with high gel contents in polar aprotic solvents. As the loading amount of P5Br is increased from 0.5% to 5%
the water uptake
swelling ratio
anion conductivity and VO
2+
permeability of the membranes are decreased
but the ion selectivity
tensile strength
area resistance and oxidative stability of the membranes are increased. The QAFPAE-P5Br-1% with only 1% of P5Br loaded has both low area resistance and low VO
2+
permeability
which are promising for VRFB applications. At a current density of 80 mA·cm
-2
the VRFB assembled with QAFPAE-P5Br-1% shows an energy efficiency of 86.5%
which is 7.7% higher than that of the VRFB assembled with Nafion 212. Besides
the VRFB assembled with QAFPAE-P5Br-1% has excellent cycling stability
high discharge capacity retention and good anti-self-discharge performance. Therefore
the dense cross-linking is an effective protocol to enhance the overall performance of AEMs.
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Related Author
Wei You
Qi-ran Lu
Rui-jiang Feng
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Lu-lu Wang
He-ting Wan
Dan Wang
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Related Institution
Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences
University of Chinese Academy of Sciences
School of Petroleum and Chemical Technology, College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University
Institute of Environmental and Biological Engineering, Nanjing University of Science and Technology
School of Environmental & Biological Engineering, Nanjing University of Science & Technology