Layer-by-layer self-assembly of PDDA/PSS-SPFEK composite membrane with low vanadium permeability for vanadium redox flow battery
Layer-by-layer self-assembly of PDDA/PSS-SPFEK composite membrane with low vanadium permeability for vanadium redox flow battery
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DOI：
10.1039/c3ra41670d
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发表时间：
2013-08
期刊：
影响因子：
3.9
通讯作者：
Yufei Wang;Shuanjin Wang;M. Xiao;Dongmei Han;M. Hickner;Y. Meng
中科院分区：
文献类型：
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作者：
Yufei Wang;Shuanjin Wang;M. Xiao;Dongmei Han;M. Hickner;Y. Meng
本文首次采用逐层自组装法（LbL）将带正电的聚二烯丙基二甲基氯化铵（PDDA）和带负电的聚苯乙烯磺酸钠（PSS）组装到磺化聚芴基醚酮（SPFEK）膜上。该膜作为钒氧化还原液流电池（VRB）的离子交换膜进行了研究。通过在SPFEK膜上沉积LbL薄膜，有效地抑制了钒离子在VRB中的渗透。随着PDDA/PSS双层膜数目的增加，膜的通透性降低。对于具有两个PDDA/PSS自组装双层的膜，可以分别提供原始SPFEK和Nafion 117膜的50%和10%的钒离子渗透率。此外，PDDA/PSS-SPFEK复合膜的氧化稳定性与原始膜相比有显著提高。因此，使用PDDA/PSS-SPFEK复合膜的VRB的性能在30 mA cm-2下表现出82.1%的最高库仑效率（CE），并且在自放电测试中表现出最长的持续稳定性。
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.