Bifunctional Cross-Linking Agents Enhance Anion Exchange Membrane Efficacy for Vanadium Redox Flow Batteries
Source abstract
Abstract
A series of cross-linked fluorinated poly(aryl ether oxadiazole) membranes (FPAEOM) derivatized with imidazolium groups were prepared. Poly(N-vinylimidazole) (PVI) was used as the bifunctional cross-linking agent to (a) lower vanadium permeability, (b) enhance dimensional stability, and (c) concomitantly provide added ion exchange capacity in the resultant anion exchange membranes. At a molar ratio of PVI to FPAEOM of 1.5, the resultant membrane (FPAEOM-1.5 PVI) had an ion exchange capacity of 2.2 mequiv g–1, a vanadium permeability of 6.8 × 10–7 cm2 min–1, a water uptake of 68 wt %, and an ionic conductivity of 22.0 mS cm–1, all at 25 °C. The FPAEOM-1.5 PVI membrane showed high chemical stability in highly acidic and oxidizing vanadium solution. Single cells prepared with the FPAEOM-1.5 PVI membrane exhibited a higher Coulombic efficiency (>92%) and energy efficiency (>86%) after 40 test cycles in vanadium redox flow battery.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced battery technologies research · Electrocatalysts for Energy Conversion · Fuel Cells and Related Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, China
Department of Chemical and Biological Engineering, Illinois Institute of Technology, Chicago, Illinois 60616, United States
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