Journal
CHEMISTRYSELECT
Volume 4, Issue 15, Pages 4633-4641Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.201900888
Keywords
Amino-functionalized UiO-66; Phosphotungstic acid; Ultra-high ion selectivity; Vanadium redox flow battery
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Funding
- National Natural Science Foundation of China [21273058, 21673064, 51802059, 21503059]
- China postdoctoral science foundation [2018M631938, 2018T110307, 2017M621284]
- Heilongjiang Postdoctoral Fund [LBH-Z17074]
- Fundamental Research Funds for the Central Universities
- NSRIF [2019040, 2019041]
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An ultra-high ion-selective Nafion composite membrane for vanadium redox flow battery (VRB) by incorporation of phosphotungstic acid (PWA) coupled UiO-66-NH2 was prepared through solution casting. Simple tuning for the filling amount of the nanohybrid composed of PWA and UiO-66-NH2 gives the obtained membranes preeminent vanadium barrier property including a minimum vanadium permeability of 3.46 x 10(-7) cm(2) min(-1) and excellent proton transport capability including a maximum proton conductivity of 0.092 S cm(-1) at 25 degrees C. These indicate an ion selectivity of 2.66 x 10(5) S min cm(-3), showing an overwhelming advantage over recast Nafion (0.34 x 10(5) S min cm(-3)). As a result, the VRB constructed with the modified membrane exhibits superior battery performance versus recast Nafion at various current densities.
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