Layer-by-layer self-assembly of Nafion-[CS-PWA] composite membranes with suppressed vanadium ion crossover for vanadium redox flow battery applications
Layer-by-layer self-assembly of Nafion-[CS-PWA] composite membranes with suppressed vanadium ion crossover for vanadium redox flow battery applications
复制标题
DOI：
10.1039/c4ra01775g
复制
发表时间：
2014-01-01
期刊：
影响因子：
3.9
通讯作者：
Xiang, Yan
中科院分区：
文献类型：
--
作者：
Lu, Shanfu;Wu, Chunxiao;Xiang, Yan
以聚阳离子壳聚糖（CS）和带负电荷的磷钨酸（PWA）为原料，采用层层自组装技术制备了一种新型的聚合物-无机复合膜Nafion-[CS-PWA]（n）（n =双层数），用于钒液流电池。紫外-可见光谱和扫描电镜结果表明，CS-PWA多层膜成功地制备在Nafion膜表面，红外光谱结果表明，CS-PWA分子之间存在较强的相互作用。得到的Nafion-[CS-PWA]（n）与原始的Nafion膜相比显示出低得多的钒离子渗透性。因此，具有Nafion-[CS-PWA]（3）膜的VRFB表现出比原始Nafion 212系统更高的库仑效率（CE）和能量效率（EE）以及更慢的自放电速率。
A novel polymer-inorganic composite membrane, Nafion-[CS-PWA](n) (n = the number of bilayers), was prepared by a layer-by-layer self-assembly technique with polycation chitosan (CS) and negatively charged phosphotungstic acid (PWA) for vanadium redox flow battery applications. The UV-visible spectra and SEM results showed that the CS-PWA multilayer was successfully fabricated on the surface of the Nafion membrane, and the FTIR result showed that there was a strong interaction between the CS and PWA molecules. The obtained Nafion-[CS-PWA](n) showed much lower vanadium ion permeability compared with the pristine Nafion membrane. Accordingly, the VRFB with the Nafion-[CS-PWA](3) membrane exhibited higher coulombic efficiency (CE) and energy efficiency (EE) together with a slower self-discharge rate than that of the pristine Nafion212 system.