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Hydrogen‐Bromine Redox‐Flow Battery Cycling with Bromine Complexing Agent: on the Benefits of Nanoporous Separator Versus Proton Exchange Membrane
Energy Technology ( IF 3.8 ) Pub Date : 2020-12-22 , DOI: 10.1002/ente.202000978
Kobby Saadi 1 , Michael Kuettinger 2 , Peter Fischer 2 , David Zitoun 1
Affiliation  

The reversible and fast redox kinetics of bromine/bromide makes it a desirable couple as a catholyte in redox‐flow batteries (RFBs). In principle, the highest possible energy density is obtained with hydrogen‐bromine RFBs. Bromine sequestration agents, also called bromine complexing agents (BCAs), bind bromine in a non‐miscible phase and can, therefore, reduce the vapor pressure of bromine, mitigate its crossover, and result in higher practical range of electrolyte concentration. Therefore, BCAs can enhance the battery's safety and competitivity by significantly decreasing the cost of components. To date, BCAs are commonly used in membrane‐free bromine systems, which cannot provide the high current density demonstrated in hydrogen‐bromine RFBs. Herein, the drastic limitations encountered are shown while operating a hydrogen‐bromine RFB with a standard perfluorinated sulfonic acid membrane due to the strong BCA–perfluorinated sulfonic acid interaction. On the other hand, the benefits of using a polyvinylidene difluoride‐silica (PVDF–SiO2) nanoporous separator are demonstrated, which does not interact with the BCA. In this approach, the hydrogen‐bromine RFB can sustain cycling, albeit at a more moderate current than a BCA‐free battery.

中文翻译:

含溴络合剂的氢溴氧化还原液流电池循环:纳米多孔隔板与质子交换膜的优势

溴/溴化物的可逆和快速氧化还原动力学使其成为氧化还原液流电池(RFB)中阴极电解液的理想对。原则上,氢溴RFB可获得最高的能量密度。溴螯合剂也称为溴络合剂(BCA),它以不可混溶的方式结合溴,因此可以降低溴的蒸气压,减轻其交叉,并导致更高的实际电解液浓度范围。因此,BCA可以通过显着降低组件成本来增强电池的安全性和竞争力。迄今为止,BCA通常用于无膜溴系统中,该系统无法提供氢溴RFB中证明的高电流密度。在这里 由于具有很强的BCA-全氟磺酸相互作用,在使用标准全氟磺酸膜运行溴化氢RFB时遇到的严峻局限性得到了体现。另一方面,使用聚偏二氟乙烯-二氧化硅(PVDF-SiO2)证明了纳米多孔隔板,它不与BCA相互作用。通过这种方法,氢溴RFB可以维持循环,尽管电流要比不含BCA的电池更适中。
更新日期:2021-02-05
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