Journal
ELECTROCHIMICA ACTA
Volume 109, Issue -, Pages 843-851Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.08.013
Keywords
Redox flow battery; Ionic liquid; Deep eutectic solvent; Wall-jet electrode; Chloroferrate
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In this paper we report the properties of the Fe(II)/Fe(III) reaction in a deep eutectic solvent based on choline chloride and ethylene glycol. This reaction is shown to be facile using a wall-jet electrode and rotating disc electrode. The deposition and stripping of iron exhibits equally slow kinetics as in aqueous systems. Using these two reactions an all-iron redox flow battery based on ionic liquids is reported for the first time. An energy efficiency of 37% is attained at a current density of 0.5 mA cm(-2). A Zn(II)-Fe(II) complex is shown to form when zinc is oxidized by Fe(III). When this complex is applied in a redox flow battery energy effitiencies of 78% are achieved at a current density of 0.5 mA cm(-2). (C) 2013 Elsevier Ltd. All rights reserved.
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