期刊
RSC ADVANCES
卷 3, 期 35, 页码 15467-15474出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra41670d
关键词
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资金
- China High-Tech Development 863 Program [2007AA03Z217]
- Guangdong Natural Science Foundation [S2012010010545]
- Guangdong Province Science & Technology Foundation [2011B050300008]
- Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme
- Guangdong Education Bureau [cxzd1004]
- Guangdong Science & Technology Bearu, Chinese Universities Basic Research Founding
Sulfonated poly(fluorenyl ether ketone) (SPFEK) membranes have been first modified by layer-by-layer (LbL) self-assembly of positively charged polyelectrolyte PDDA (poly(diallyldimethylammonium chloride)) and negatively charged PSS (poly(sodium styrene sulfonate)). The membranes were investigated as an ion exchange membrane for vanadium redox flow batteries (VRBs). The permeability of the vanadium ions in VRBs was effectively suppressed by depositing the LbL thin film on the SPFEK membrane. The permeability decreased with increasing the number of PDDA/PSS bilayers. For the membrane with two self-assembly bilayers of PDDA/PSS, 50% and 10% of vanadium ion permeability of a pristine SPFEK and Nafion 117 membranes can be afforded, respectively. Moreover, the oxidative stability of the PDDA/PSS-SPFEK composite membrane is improved remarkably compared with the pristine one. Consequently, the performance of VRBs using the PDDA/PSS-SPFEK composite membrane exhibits the highest coulombic efficiency (CE) of 82.1% at 30 mA cm(-2) and the longest duration stability in the self-discharge test.
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