Electrochemical behaviour of Fe and Fe-Si electrodes in molten hydroxides mixture
Department of Inorganic Technology, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovakia
a Department of Molecular Electrochemistry, J. Heyrovský Institute of Physical Chemistry of the ASCR, Dolejškova 2155/3, 182 23 Prague, Czech Republic
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Abstract: Mixture of NaOH-KOH eutectic melt was selected as the most appropriate system for the electrochemical synthesis of Ferrate(VI) in a molten salt at the temperatures of 170 °C. Cyclic voltammetry was used to characterise the processes taking place on the stationary iron and Si-rich iron electrode. The anodic current peaks corresponding to the Ferrate(VI) production as well as cathodic current peaks corresponding to the Ferrate(VI) reduction appeared on voltammetric curves. EIS method was used to characterise surface layers on the anode materials during Ferrate(VI) preparation. Impedance spectra are characterised with two time constants which correspond to the model of duplex layer structure on the anode surfaces.
Keywords: Ferrate(VI), Molten Hydroxides Mixture, Electrochemical Impedance Spectroscopy, Cyclic Voltammetry
Full paper in Portable Document Format: acs_0070.pdf
Acta Chimica Slovaca, Vol. 3, No. 2, 2010, pp. 74—83