TY - JOUR
T1 - Bifunctional crosslinking agents enhance anion exchange membrane efficacy for vanadium redox flow batteries
AU - Wang, Wenpin
AU - Xu, Min
AU - Wang, Shubo
AU - Xie, Xiaoeng
AU - Lv, Yaei
AU - Ramani, Vijay
PY - 2014
Y1 - 2014
N2 - 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 meq 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.
AB - 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 meq 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.
KW - Bifunctional crosslinker
KW - Cross-linked AEM
KW - Density functional theory (DFT)
KW - Energy storage
KW - Vanadium redox flow battery
UR - https://www.scopus.com/pages/publications/84990843521
U2 - 10.1021/am501540g
DO - 10.1021/am501540g
M3 - Article
C2 - 24884171
AN - SCOPUS:84990843521
SN - 1944-8244
VL - 2014
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
ER -