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Hydrocarbon membranes with high selectivity and enhanced stability for vanadium redox flow battery applications: Comparative study with sulfonated poly(ether sulfone)s and sulfonated poly(thioether ether sulfone)s
- Source :
- Electrochimica Acta. 259:427-439
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- A series of sulfonated poly(ether sulfone) copolymers (SPES-Xs) with varying degrees of sulfonation were prepared and investigated as ion-exchange membranes for vanadium redox flow battery (VRFB) applications. Sulfonated poly(thioether ether sulfone) copolymers (SPTES-Xs) were initially synthesized via polycondensation, and the SPES-Xs were then obtained by oxidation of the corresponding SPTES-Xs. The SPES-X membranes showed reduced vanadium-ion permeability, low area resistance, and, thereby, much superior selectivity compared with the parent SPTES-X membranes and a Nafion115 membrane. In single-cell VRFB performance tests, a SPES-50 membrane with an ion-exchange capacity of 1.80 meq/g exhibited a higher coulombic efficiency (>99%) and energy efficiency (76–89%) than the Nafion115 membrane over a wide range of current densities from 40 to 100 mA/cm2 and a significantly larger capacity retention (>62%) during 200 charge-discharge cycles. The SPES-X materials, in which every benzene ring is deactivated by the presence of electron-withdrawing sulfone linkages, showed much better chemical stability during ex situ and in situ tests than the SPTES-X materials, which contain an electron-donating thioether linkage in their repeat unit.
- Subjects :
- General Chemical Engineering
Vanadium
chemistry.chemical_element
Ether
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Flow battery
0104 chemical sciences
Sulfone
chemistry.chemical_compound
Membrane
Thioether
chemistry
Polymer chemistry
Electrochemistry
Chemical stability
0210 nano-technology
Selectivity
Subjects
Details
- ISSN :
- 00134686
- Volume :
- 259
- Database :
- OpenAIRE
- Journal :
- Electrochimica Acta
- Accession number :
- edsair.doi...........c6dfa9981bbb96db1e55b5f3ac2b1b11