Energy storage inspired by nature – ionic liquid iron–sulfur clusters as electrolytes for redox flow batteries 1. Issue 6 (11th January 2019)

• Record Type: Journal Article
• Authors: Modrzynski, Christian; Burger, Peter
• Is Part Of: Dalton transactions. Volume 48:Issue 6(2019)
• Page Start: 1941
• Page End: 1946
• Publication Date: 2019-01-11
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt03776k
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A redox flow battery electrolyte with a high energy density based on redox-active ionic liquids with iron–sulfur-clusters was prepared and investigated. Abstract : 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 [Fe4 S4 (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 ).