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Research Article Open Access
The electrochemical behavior of Fe(III) in molten LiF–NaF–KF [46.5:11.5:42 (mol%)] [FLINAK] salt was studied by cyclic voltammetry (CV), chronopotentiometry (CP) and square wave voltammetry (SWV) at 600°C. It was found that Fe(III) was initially reduced to Fe(II) at +2.0 V (vs. alkalis) followed by reduction of Fe(II) to Fe at +1.4 V (vs. alkalis) and both reduction processes were controlled by ion diffusion. Diffusion coefficients of Fe(III) in molten FLINAK were calculated through CV and CP. The reduction peak of Fe(III)/Fe(II) was still observed in SWVs even though only FeF2 was added to FLINAK. This result showed that Fe(II) was converted to Fe(III), which exists stably in FLINAK melts.
Molten fluorides, Stable iron valence, Cyclic voltammetry, Chronopotentiometry, Square wave voltammetry, Potentiometry, Voltammetry, Coulometry, Biosensors, Environmental Monitoring, Corrosion, Analytical Methods, Electrochemical Methods, Impedance Spectroscopy, Conductometry, Electrochemical Synthesis