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In situ bulk magnetization measurements reveal the state of charge of redox flow batteries
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Peer-reviewed
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Authors
Klusener, Peter AA
Abstract
We report two methods, including NMR spectroscopy and direct magnetic susceptibility measurement, for in situ (strictly online) measurement of the state of charge of redox flow batteries. These methods are demonstrated on the inorganic redox-active catholyte potassium ferro/ferri cyanide cycled against 2,6-dihydroxyanthraquinone as the anolyte in a full cell, and should be applicable to a wide range of redox couples, provided that the magnetization of the electrolyte solution depends on its oxidation state.
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Keywords
34 Chemical Sciences, 3406 Physical Chemistry
Journal Title
Chemical Communications
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Journal ISSN
1359-7345
1364-548X
1364-548X
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Publisher
Royal Society of Chemistry
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Sponsorship
Engineering and Physical Sciences Research Council (EP/P007767/1)
C.P.G. acknowledges support from Centre of Advanced Materials for Integrated Energy Systems (CAM-IES) via EPSRC grant number EP/P007767/1, and support from Shell. E.W.Z. acknowledges the start-up support from Institute for Molecules and Materials, Radboud University Nijmegen. The authors acknowledge Prof. Dominic Wright from the University of Cambridge for helpful discussions, and Dr. Chris Brackstone from the physical teaching laboratory for lending the Evans balance.