Abstract
Abstract The electrochemical behavior of a single-crystal magnetite (Fe3O4) was investigated in perchloric acid (HClO4) at different pH values using linear sweep voltammetry. The logarithm of peak current density of the reductive dissolution of magnetite decreased linearly with the increased solution pH. The effect of applied potential on the reductive dissolution in HClO4 was studied using electrochemical impedance spectroscopy. The results were analyzed in terms of a suitable equivalent circuit. The rate of dissolution and the double-layer capacitance were not linearly related with potential. Impedance measurements were also carried out in solutions containing oxalic acid (HOOCCOOH) and various amounts of ferrous ions. Magnetite dissolves reductively in this solution. The rate of dissolution was proportional to the ferrous ion concentration. The rate of dissolution and the double-layer capacitance were higher than those observed in HClO4.
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