期刊
JOURNAL OF ENERGY CHEMISTRY
卷 41, 期 -, 页码 177-184出版社
ELSEVIER
DOI: 10.1016/j.jechem.2019.05.022
关键词
Vanadium redox flow battery; Modified silica; Phosphotungstic acid; Low vanadium permeability
资金
- National Natural Science Foundation of China [21273058, 21673064, 51802059, 21503059]
- China postdoctoral science foundation [2018M631938, 2018T110307, 2017M621284]
- Heilongjiang Postdoctoral Fund [LBH-Z17074, LBH-Z18066]
- Fundamental Research Funds for the Central Universities
- NSRIF [2019040, 2019041]
An ultra-high ion-selective Nafion composite membrane modified by phosphotungstic acid (PWA) coupled silica for vanadium redox flow battery (VRB) was constructed and prepared through solution casting. The composite membrane exhibits excellent proton conductivity and vanadium ions blocking property by incorporating the nanohybrid composed of silica and PWA into the Nafion ionomer. Simple tuning for the filling amount of the nanohybrid endows the obtained membranes preeminent vanadium barrier property including a minimum vanadium permeability of 3.13 x 10(-7) cm(2 )min(-1) and a maximum proton conductivity of 0.081 S cm(-1) at 25 degrees C. These indicate an ion selectivity of 2.59 x 10(5) S min cm(-3), which is 6.8 times higher than that of recast Nafion (0.33 x 10(5) S min cm(-3)). As a result, the VRB with the composite membrane shows superior battery performance containing a lower self-discharge rate, higher capacity retention and more robust cyclic stability compared with recast Nafion over a range of current densities from 40 to 100 mA cm(-2). (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
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