Selective Electrochemical Synthesis of Ferrate on SnO2-Sb2O3/Ti Electrodes

Abstract

Abstract: The electrode of SnO₂-Sb₂O₃/Ti was manufactured in this research. The results prove that the electrochemical generation of FeO^2-₄ could be carried out on this kind of electrode in a 14 mol/L NaOH solution without any impact of the side reaction of oxygen evolution reaction(OER) under the same experimental condition. The results indicate that the dissoluble ion, FeO₂^- is one of existent formations of (Fe(Ⅲ) compounds), the ion is a reactant of the chemical oxidation and electrochemical oxidation, the redox couple is not FeO^2-₄/Fe(OH)₃, but FeO^2-₄/FeO₂^- in the concentratied NaOH solution. The feebly amphoteric property of Fe(Ⅲ) compounds plays a considerable role in the manufacture of safety rechargeable batteries. Furthermore, the onset potential value of electro-oxidation of FeO₂^-(0.38 V vs. Hg/HgO, 14 mol/L NaOH) is close to that of electro-reduction of FeO^2-₄(0.54 V) under the same research condition. The results also indicate that the mechanism of electrochemical generation of FeO^2-₄ from FeO₂^- is an electro-chemical mechanism. In addition, the excellent stability of the SnO₂-Sb₂O₃/Ti electrode was exhibited under the research condition.

Key words: Ferrate, Electro-oxidation, Dimensionally stable anode(DSA), Cyclic voltammetry, Secondary battery

CLC Number:

O646

TrendMD:

ZHANG Cun-Zhong, LIU Zhen, LIN Li-Jun, QI Fei, WU Feng. Selective Electrochemical Synthesis of Ferrate on SnO₂-Sb₂O₃/Ti Electrodes[J]. Chem. J. Chinese Universities, 2005, 26(5): 927.

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Selective Electrochemical Synthesis of Ferrate on SnO₂-Sb₂O₃/Ti Electrodes

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