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Poly(p-phenylene)-based membrane materials with excellent cell efficiencies and durability for use in vanadium redox flow batteries

Abstract

poly(p-phenylene)-based ionomers with remarkable durability and rate capability for use in vanadium redox flow batteries (VRFB) are reported. The family of synthesized ionomers, sPBPSP-z, exhibited not only well-developed phase separation between the hydrophilic domains and hydrophobic domains but also well-connected hydrophilic channels, resulting in enhanced proton conductivities and excellent dimensional stabilities. sPBPSP-8, which has an ion exchange capacity of 1.83 meq g-1, showed high discharge capacity retention and superior efficiencies over 100 cycles at a current density of 50 mAcm-2. In addition, the sPBPSP-8 ionomer exhibited stable performance at various current densities (50-180 mAcm-2) and retained high efficiencies at high current densities. Furthermore, this material exhibited superior chemical stability in oxidizing conditions, excellent capacity retention, and high efficiencies during long-term VRFB performance (1000 cycles). These results indicate that the sPBPSP-8 membrane is a superb material for VRFB applications.

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Publication details

The article was received on 11 Apr 2017, accepted on 15 May 2017 and first published on 15 May 2017


Article type: Paper
DOI: 10.1039/C7TA03131A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Poly(p-phenylene)-based membrane materials with excellent cell efficiencies and durability for use in vanadium redox flow batteries

    H. Y. Shin, M. S. Cha, S. H. Hong, T. Kim, D. Yang, S. Oh, J. Y. Lee and Y. T. Hong, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03131A

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