Pore-Size-Tuned Graphene Oxide Frameworks as Ion-Selective and Protective Layers on Hydrocarbon Membranes for Vanadium Redox-Flow Batteries

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The laminated structure of graphene oxide (GO) membranes provides exceptional ion-separation properties due to the regular interlayer spacing (d) between laminate layers. However, a larger effective pore size of the laminate immersed in water (similar to 11.1 angstrom) than the hydrated diameter of vanadium ions (>6.0 angstrom) prevents its use in vanadium redox-flow batteries (VRFB). In this work, we report an ion-selective graphene oxide framework (GOF) with a d tuned by cross-linking the GO nanosheets. Its effective pore size (similar to 5.9 angstrom) excludes vanadium ions by size but allows proton conduction. The GOF membrane is employed as a protective layer to address the poor chemical stability of sulfonated poly(arylene ether sulfone) (SPAES) membranes against VO2+ in VRFB. By effectively blocking vanadium ions, the GOF/SPAES membrane exhibits vanadium-ion permeability 4.2 times lower and a durability 5 times longer than that of the pristine SPAES membrane. Moreover, the VRFB with the GOF/SPAES membrane achieves an energy efficiency of 89% at 80 mA cm(-2) and a capacity retention of 88% even after 400 cycles, far exceeding results for Nafion 115 and demonstrating its practical applicability for VRFB.
Publisher
AMER CHEMICAL SOC
Issue Date
2018-06
Language
English
Article Type
Article
Citation

NANO LETTERS, v.18, no.6, pp.3962 - 3968

ISSN
1530-6984
DOI
10.1021/acs.nanolett.8b01429
URI
http://hdl.handle.net/10203/244301
Appears in Collection
CBE-Journal Papers(저널논문)
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