Chromium redox couples for application to redox flow batteries

Both anodic and cathodic chromium–EDTA (ethylenediaminetetra-acetate) complex redox processes have been studied using cyclic voltammetry. Their potential use in a redox battery has been evaluated by comparing the charge and discharge performance of a simple redox battery employing several redox coup...

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Bibliographic Details
Published in:Electrochimica acta 2002-12, Vol.48 (3), p.279-287
Main Authors: Bae, C.-H, Roberts, E.P.L, Dryfe, R.A.W
Format: Article
Language:English
Subjects:
Applied sciences
Chromium–EDTA complexes
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
Graphite electrodes
Redox couples
Redox flow battery
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Summary:Both anodic and cathodic chromium–EDTA (ethylenediaminetetra-acetate) complex redox processes have been studied using cyclic voltammetry. Their potential use in a redox battery has been evaluated by comparing the charge and discharge performance of a simple redox battery employing several redox couples including the conventional Fe–Cr redox couples. The cyclic voltammetry experiments suggested that oxidation of Cr(III)–EDTA formed Cr(V)–EDTA rather than a hexavalent chromium species. It was found that the kinetics of the Cr(III)–EDTA/Cr(II)–EDTA redox reaction are fast at a graphite rod electrode, whereas the Cr(V)–EDTA/Cr(III)–EDTA redox reaction is relatively slow. In spite of the slow kinetics, the battery employing solely these chromium–EDTA based redox couples provided higher energy output and longer life than the conventional Fe–Cr redox system.
ISSN:0013-4686
1873-3859
DOI:10.1016/S0013-4686(02)00649-7