Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 595, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2019.117569
Keywords
Flow batteries; Pore size exclusion; Zeolites; Composite membranes; Interfacial polymerization
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Funding
- Natural Science Foundation of China [U1808209]
- CAS Interdisciplinary Innovation Team [JCTD-2018-10]
- Strategic Priority Research Program of the CAS [XDA21070100]
- Key project of Frontier Science in CAS [QYZDB-SSWJSC032]
- Key R&D project of Da Lian [2018YF17GX020]
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A zeolite composite membrane (ZCM) was designed and fabricated via a simple versatile and scalable method. A thin layer of ZSM-35 flakes with pore size between hydrated protons and vanadium ions was fixed on the poly (ether-sulfone)/sulfonated poly(ether-ether-ketone) (PES/SPEEK) porous substrate by in-situ interfacial polymerization. The ZSM flake layer can perfectly separate hydrated vanadium ions and protons, therefore, show very impressive performance for vanadium flow batteries (VFBs). As a result, a VFB assembled with an optimized ZCM exhibited a columbic efficiency more than 99% and energy efficiency of over 91% at a current density of 80 mA cm(-2), which is among the highest performance ever reported. Furthermore, the energy efficiency can reach 81.6% at a very high current density of 200 mA cm(-2) and keep stable for 1000 cycles at a current density of 180 mA cm(-2). This method opened a door toward the large-scale production of highly selective composite membranes for flow batteries.
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