Selective anion exchange membranes for high coulombic efficiency vanadium redox flow batteries
A quaternary ammonium functionalized poly(fluorenyl ether) anion exchange membrane (AEM) with extremely low VO2+ permeation was characterized for vanadium redox flow battery (VRFB) application. One hundred percent coulombic efficiency (CE) was achieved for the AEM-based VRFB at all the current densi...
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Published in | Electrochemistry communications Vol. 26; pp. 37 - 40 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Lausanne
Elsevier B.V
01.01.2013
Amsterdam Elsevier New York, NY |
Subjects | |
Online Access | Get full text |
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Summary: | A quaternary ammonium functionalized poly(fluorenyl ether) anion exchange membrane (AEM) with extremely low VO2+ permeation was characterized for vanadium redox flow battery (VRFB) application. One hundred percent coulombic efficiency (CE) was achieved for the AEM-based VRFB at all the current densities tested. Comparatively, the CE of a N212 membrane-based VRFB was lower than 94% and varied with charge/discharge current density. At current densities lower than 60mAcm−2, the energy effiency of the AEM-based VRFB was higher than that of a device with N212. The cycling performance demonstrated that the AEM-based VRFB was free of capacity fade, which is a consequence of its low VO2+ permeability. These observations are of significant importance for flow batteries that operate intermittently or at moderate current densities.
► Anion exchange membrane blocked the transport of vanadium ions due to the Donnan effect. ► One hundred percent coulombic efficiency of battery was achieved using anion exchange membrane. ► Lower current density gave higher voltage efficiency and energy efficiency. ► No capacity fade for maintenance-free operation |
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ISSN: | 1388-2481 1873-1902 |
DOI: | 10.1016/j.elecom.2012.10.007 |