钒
聚砜
膜
聚偏氟乙烯
流动电池
Nafion公司
材料科学
法拉第效率
渗透
电化学
化学工程
氧化还原
高分子化学
氟化物
离子交换
无机化学
化学
电极
离子
有机化学
电解质
物理化学
工程类
生物化学
作者
Jun Ren,Yichao Dong,Jicui Dai,Huili Hu,Yongming Zhu,Xiangguo Teng
标识
DOI:10.1016/j.memsci.2017.09.015
摘要
Blend membranes of quaternized polysulfone/polyvinylidene fluoride (Q/P) for all vanadium redox flow battery (VRFB) are prepared by one-step solution casting method to reduce the vanadium permeation and improve the mechanical properties of pure quaternized polysulfone membrane. The physicochemical properties and electrochemical performances of the Q/P membranes are characterized in detail. In comparison with the Nafion 115 membrane, Q/P blend membranes exhibit higher water uptake, ion exchange capacity (IEC) and swelling ratio, lower ionic conductivity and ultra-lower vanadium permeability, better stability and superior VRFB cycle performances. Owing to the ultra-low vanadium permeability, the VRFB with Q/P-20% blend membrane has shown the highest coulombic efficiency of 99.29% at 80 mA cm−2 and the Q/P-15% membrane has shown the highest EE of 91.12% at 40 mA cm−2, which is 4.89% and 3.33% higher than that of Nafion 115 at the same current density, respectively. The mechanical properties of the Q/P blend membranes increase with the increasing of the PVDF mass ratio. It reveals that the introduction of PVDF is of great significance to improve the performances of the Q/P blend membranes.
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