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“Fishnet-like” ion-selective nanochannels in advanced membranes for flow batteries

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Abstract

“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.

Graphical abstract: “Fishnet-like” ion-selective nanochannels in advanced membranes for flow batteries

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Publication details

The article was received on 23 Jun 2019, accepted on 29 Jul 2019 and first published on 31 Jul 2019


Article type: Paper
DOI: 10.1039/C9TA06742F
J. Mater. Chem. A, 2019, Advance Article

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    “Fishnet-like” ion-selective nanochannels in advanced membranes for flow batteries

    L. Hu, L. Gao, C. Zhang, X. Yan, X. Jiang, W. Zheng, X. Ruan, X. Wu, G. Yu and G. He, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA06742F

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