期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 37, 页码 21112-21119出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta06742f
关键词
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资金
- National Science Foundation of China [U1808209]
- National Key Research and Development Program of China [2016YFB0101203]
- Fundamental Research Funds for the Central Universities [DUT18JC40]
Fishnet-like ion-selective nanochannels for advanced membranes are designed for the first time to enhance the efficiency and durability of flow batteries. A fishnet-like structure with 10 nm ion-transport channels is achieved by tuning the hydrophobic/hydrophilic nanophase separation structure of the membrane, in which absorbed water molecules are restricted around hydrophilic polyethylenimine (PEI) chains by hydrophobic polybenzimidazole (PBI). Owing to the size-exclusion and high-density protonated amine groups of PEI fishnets, the membrane exhibits ultralow VO2+ permeability without sacrificing its ion conductivity, ensuring high energy efficiency of vanadium flow batteries. Furthermore, the demonstrated vanadium flow battery with the fishnet-based membrane steadily run at 120 mA cm(-2) over 2000 cycles (about 120 days). These findings provide a new strategy for the design of high-performance and cost-effective membranes for vanadium flow battery applications.
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