流动电池
钒
氧化还原
法拉第效率
化学工程
膜
无机化学
电解质
电化学
化学
电极
材料科学
工程类
生物化学
冶金
物理化学
作者
Tao Luo,Oana David,Youri Gendel,Matthias Weßling
标识
DOI:10.1016/j.jpowsour.2016.02.042
摘要
Porous poly(benzimidazole) (PBI) membranes of low vanadium ions permeability are described for an all vanadium redox flow battery (VRFB). The PBI membrane was prepared by a water vapour induced phase inversion process of a PBI polymer solution. The membrane has a symmetrical cross-sectional morphology. A low water permeability of 16.5 L (m2 h bar)−1 indicates the high hydraulic resistance stemming from a closed cell morphology with nanoporous characteristics. The PBI membrane doped with 2.5 M H2SO4 shows a proton conductivity of 16.6 mS cm−1 and VO2+ permeability as low as 4.5 × 10−8 cm2 min−1. The stability test of dense PBI membrane in VO2+ solution indicates good chemical stability. An all vanadium redox flow battery (VRFB) operated with the porous PBI membrane shows 98% coulombic efficiency and more than 10% higher energy efficiency compared to VRFB operated with Nafion 112 at applied current densities of 20–40 mA cm−2. High in situ stability of the porous PBI membrane was confirmed by about 50 cycles of continuous charge and discharge operation of the battery.
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