Journal
POLYMERS
Volume 13, Issue 16, Pages -Publisher
MDPI
DOI: 10.3390/polym13162827
Keywords
redox flow battery; blended anion exchange membrane; low permeability of vanadium ion
Categories
Funding
- National Research Foundation or Korea (NRF)
- Ministry of Science, ICT & Future Planning [NRF-2021M1A2A2038115]
- basic science research program - ministry of education [NRF-2020R1A6A1A03038697]
- Ministry of Environment Global Top Environmental Technology Development Project [RE2019002210002]
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Blended anion exchange membranes prepared in this study showed lower vanadium ion permeability and self-discharge rate compared to commercial proton exchange membranes, making them a promising candidate for vanadium redox flow batteries.
In this study, blended anion exchange membranes were prepared using polyphenylene oxide containing quaternary ammonium groups and polyvinylidene fluoride. A polyvinylidene fluoride with high hydrophobicity was blended in to lower the vanadium ion permeability, which increased when the hydrophilicity increased. At the same time, the dimensional stability also improved due to the excellent physical properties of polyvinylidene fluoride. Subsequently, permeation of the vanadium ions was prevented due to the positive charge of the anion exchange membrane, and thus the permeability was relatively lower than that of a commercial proton exchange membrane. Due to the above properties, the self-discharge of the blended anion exchange membrane (30.1 h for QA-PPO/PVDF(2/8)) was also lower than that of the commercial proton exchange membrane (27.9 h for Nafion), and it was confirmed that it was an applicable candidate for vanadium redox flow batteries.
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