流动电池
钒
聚酰亚胺
Nafion公司
选择性
膜
氧化还原
材料科学
无机化学
电化学
化学
高分子化学
有机化学
电极
物理化学
催化作用
电解质
生物化学
图层(电子)
作者
Jun Long,Wenjie Xu,Shoubin Xu,Jun Liu,Yanlin Wang,Huan Luo,Yaping Zhang,Jinchao Li,Liang‐Yin Chu
标识
DOI:10.1016/j.memsci.2021.119259
摘要
The development of a vanadium redox flow battery (VRFB) urgently requires proton conductive membranes with high proton selectivity. Herein, we synthesized branched anhydride monomer 1,3,5-tris(3,4-anhydride phenoxy)benzene using a three-step method. Furthermore, we prepared successfully novel double branched sulfonated polyimide (dbSPI) membranes with ultra-low vanadium ion permeability (0.4–2.5×10−8 cm2 min−1), one or two orders of magnitude lower than that of the Nafion 212 membrane (7.25×10−7 cm2 min−1). Among all membranes, the dbSPI-50 membrane with the highest proton selectivity (23.25×105 S min cm−3), approximately 68 times higher than that of the Nafion 212 membrane, was chosen for assembling of a VRFB single cell. Because of its ultra-low vanadium ion permeability, the dbSPI-50 membrane exhibited much longer self-discharge time (97 h) and superior capacity retention (82.6–91.3%) compared with the Nafion 212 membrane. Moreover, both coulomb efficiency (99.6–98.5%) and energy efficiency (69.3–80.1%) of the dbSPI-50 membrane are higher than those of the Nafion 212 membrane after 300 times charge-discharge tests at a current density from 200 to 100 mA cm−2. All these results demonstrate that the optimized dbSPI-50 membrane is a promising candidate for applications in VRFBs.
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