Wire based electrospun composite short side chain perfluorosulfonic acid/ polyvinylidene fluoride membranes for hydrogen-bromine flow batteries

JOURNAL OF POWER SOURCES

卷:497

Article

Hugo, Yohanes Antonius^1,2  Kout, Wiebrand²  Forner-Cuenca, Antoni¹  Borneman, Zandrie^1,3  Nijmeijer, Kitty^1,3 

[1] Eindhoven Univ Technol, Dept Chem Engn & Chem, Membrane Mat & Proc, POB 513, NL-5600 MB Eindhoven, Netherlands

[2] Elestor BV, POB 882, NL-6800 AW Arnhem, Netherlands

[3] Dutch Inst Fundamental Energy Res Differ, POB 6336, NL-5600 HH Eindhoven, Netherlands

关键词: Hydrogen-bromine flow batteries (HBFBs);    Ion exchange membranes;    Wire based electrospinning;    Short side chain perfluorosulfonic acid& nbsp;    membranes;   

DOI  :  10.1016/j.jpowsour.2021.229812

来源: Elsevier

【 摘 要 】

A main component of a hydrogen-bromine flow battery (HBFB) is the ion exchange membrane. Available membranes have a trade-off between the major requirements: high proton conductivity, low bromine species crossover, and high mechanical and chemical stability. To overcome this, electrospinning of a highly proton conductive polymer (short side chain perfluorosulfonic acid (SSC PFSA)) and a hydrophobic inert polymer (polyvinylidene fluoride (PVDF)) was used to electrospin composite polymer fiber mats. Piles of multiple mats were hot pressed resulting in dense ion exchange membranes. Membranes with three different SSC PFSA/PVDF ratios were prepared, characterized, and subjected to short and long term (1500 h) HBFB testing. The electrospun membranes have performances very comparable to those of commercial membranes. For the SSC PFSA/PVDF electrospun membrane, a higher SSC PFSA loading gives a higher membrane proton conductivity compared to a lower loading, but at the expense of a higher bromine species crossover. The SSC PFSA/PVDF (50/50 wt%) membrane shows a coulombic efficiency of 98%, a voltaic efficiency of 80% and an initial available capacity of 105 Ah L-1 at a current density of 150 mA cm-2, which equals that of the current benchmark long side chain PFSA membrane. This performance is constant over 200 cycles during 2 months of continuous HBFB operation.

【 授权许可】

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