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Active material crossover suppression with bi-ionic transportability by an amphoteric membrane for Zinc–Bromine redox flow battery

Title
Active material crossover suppression with bi-ionic transportability by an amphoteric membrane for Zinc–Bromine redox flow battery
Author(s)
Han, DabinShanmugam, Sangaraju
DGIST Authors
Han, DabinShanmugam, Sangaraju
Issued Date
2022-08
Type
Article
Author Keywords
Active materials crossover suppressionAmphoteric membraneBi-ionic transportHigh coulombic efficiencyHigh ion conductivityZinc-bromine redox flow battery
Keywords
PROTON-EXCHANGE MEMBRANEENERGY-STORAGE SYSTEMPERFORMANCENAFIONCONDUCTIVITYELECTROLYTE
ISSN
0378-7753
Abstract
Zinc-bromine redox flow batteries (Zn/Br2 RFBs) are gaining attention as a next-generation energy storage system with the advantages of a cost-effective redox couple material price, high output, and high energy density. However, bromine (Br2) crossover through a commercial porous membrane causes self-discharge to lower the capacity retention. Nafion, a commercial ion exchange membrane, can lower the crossover but has low voltage efficiency due to high membrane resistance. To address this trade-off, the amphoteric functionalized silica (Am-SiO2) is introduced into the Nafion membrane (Nafion/Am-SiO2). It suppresses the crossover of active materials such as Br2 and polybromide (Brn−) and possesses high ionic conductivity due to the quaternary ammonium and sulfonic groups on the Am-SiO2 surface. In addition, increasing the water content in the membrane prevents the expansion of the water cluster size, which could help balance bi-ionic transport. As a result, the composite membrane showed 83.3 and 19.0 times higher ion selectivity than the commercial porous membrane (SF600) and ion-exchange membrane (NRE-212). Compared to SF600 and NRE-212, the energy efficiency of Nafion/Am-SiO2 was improved by 4.2 and 6.4%, respectively. Balancing anion and cation transport can be successfully applied in Zn/Br2 RFBs by introducing an amphoteric group into an ion-exchange membrane. © 2022 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/16973
DOI
10.1016/j.jpowsour.2022.231637
Publisher
Elsevier BV
Related Researcher
  • 상가라쥬샨무감 Shanmugam, Sangaraju 에너지공학과
  • Research Interests Electrocatalysts for fuel cells; water splitting; metal-air batteries; Polymer electrolyte membranes for fuel cells; flow batteries; Hydrogen generation and utilization
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Appears in Collections:
Department of Energy Science and Engineering Advanced Energy Materials Laboratory 1. Journal Articles

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