Institut für Anorganische und Angewandte Chemie, Department Chemie, Universität Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany.
Dalton Trans. 2019 Feb 5;48(6):1941-1946. doi: 10.1039/c8dt03776k.
The redox flow battery (RFB) is a promising technology for the storage of electric energy. Many commercial RFBs are often based on acidic vanadium electrolyte solutions that have limitations regarding stability and energy density. Here, a new approach is presented that is inspired by nature's electron storage, i.e. iron-sulfur clusters [Fe4S4(SR)4]2-. In combination with imidazolium cations, new ionic liquid electrolyte materials were obtained and characterized with regard to their physico- and electrochemical properties. For flow battery tests, the bromide/bromine redox-couple was used in the second half cell in an ionic liquid solution. In these measurements, liquid iron-sulfur clusters show high coulombic (>95%) and energy (69%) efficiencies combined with a high theoretical energy density (88 W h L-1).
氧化还原液流电池（RFB）是一种很有前途的电能存储技术。许多商业化的 RFB 通常基于酸性钒电解质溶液，这种溶液在稳定性和能量密度方面存在局限性。这里提出了一种新的方法，它的灵感来自于自然界中的电子存储，即铁-硫簇[Fe4S4(SR)4]2-。结合咪唑阳离子，获得了新的离子液体电解质材料，并对其物理和电化学性质进行了表征。对于液流电池测试，溴化物/溴氧化还原偶联物在第二半电池中在离子液体溶液中使用。在这些测量中，液体铁-硫簇显示出高库仑（>95%）和能量（69%）效率，结合高理论能量密度（88 W h L-1）。
