Room temperature ionic liquid electrolytes for redox flow batteries

Ejigu, Andinet, Greatorex-Davies, Peter and Walsh, Darren A. (2015) Room temperature ionic liquid electrolytes for redox flow batteries. Electrochemistry Communications, 54 . pp. 55-59. ISSN 1388-2481

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Redox flow batteries (RFBs) usually contain aqueous or organic electrolytes. The aim of this communication is to explore the suitability of room temperature ionic liquids (RTILs) as solvents for RFBs containing metal complexes. Towards this aim, the electrochemistry of the metal acetylacetonate (acac) complexes Mn(acac)3, Cr(acac)3, and V(acac)3 was studied in imidazolium-based RTILs. The V2+/V3+, V3+/V4+, and V4+/V5+ redox couples are quasi-reversible in 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, [C2C1Im][N(Tf2)]. The Mn(acac)3 and Cr(acac)3 voltammetry, on the other hand, is irreversible in [C2C1Im][N(Tf2)] at glassy carbon (GC) but the rate of the Mn2+/Mn3+ reaction increases if Au electrodes are used. Charge–discharge measure- ments show that a coulombic efficiency of 72% is achievable using a V(acac)3/[C2C1Im][N(Tf2)]/GC cell.

Item Type: Article
Keywords: Ionic liquids; Energy storage; Cyclic voltammeter; Electrochemical impedance spectroscopy; Redox flow battery
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Chemistry
Identification Number:
Depositing User: Walsh, Darren
Date Deposited: 10 Oct 2016 07:55
Last Modified: 04 May 2020 20:08

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