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Room temperature ionic liquid electrolytes for redox flow batteries

Ejigu, Andinet; Greatorex-Davies, Peter; Walsh, Darren A.

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Authors

Andinet Ejigu

Peter Greatorex-Davies

DARREN WALSH DARREN.WALSH@NOTTINGHAM.AC.UK
Professor of Chemistry



Abstract

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.

Citation

Ejigu, A., Greatorex-Davies, P., & Walsh, D. A. (2015). Room temperature ionic liquid electrolytes for redox flow batteries. Electrochemistry Communications, 54, https://doi.org/10.1016/j.elecom.2015.01.016

Journal Article Type Article
Acceptance Date Jan 20, 2015
Online Publication Date Jan 28, 2015
Publication Date May 1, 2015
Deposit Date Oct 10, 2016
Publicly Available Date Oct 10, 2016
Journal Electrochemistry Communications
Print ISSN 1388-2481
Electronic ISSN 1388-2481
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 54
DOI https://doi.org/10.1016/j.elecom.2015.01.016
Keywords Ionic liquids; Energy storage; Cyclic voltammeter; Electrochemical impedance spectroscopy; Redox flow battery
Public URL https://nottingham-repository.worktribe.com/output/983771
Publisher URL http://www.sciencedirect.com/science/article/pii/S1388248115000260
Contract Date Oct 10, 2016

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