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Studies on the influence of various experimental conditions on electrochemical generation of ferrate(VI) in NaOH-KOH mixed electrolyte

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Abstract

Ferrate(VI) was prepared by electrooxidation in diaphragm electrolyzer with iron wire gauze as anode and NaOH-KOH mixed solution as electrolyte. The influences of various experimental conditions, such as the volume ratio of NaOH-KOH mixed electrolyte, temperature, current density, passivation of iron anode were investigated on ferrate current efficiency. Due to the low solubility of K2FeO4 in concentrated alkaline solution and the passivation of iron wire gauze anode, a highest current efficiency over 90% was obtained at 45°C and at a current density of 5 mA cm−2 in mixed electrolyte with the volume ratio of NaOH: KOH equal to 6: 4. The result is superior to using NaOH and KOH as electrolyte respectively. In addition, polarization curves, scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS) were employed to further study the effects of synthesis conditions on ferrate(VI) in theory.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Huaqiao University, Quanzhou, 362021, P. R. China

    Weihua Yang, Yan Zhou, Honghui Wang & Dongqin Bi

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  1. Weihua Yang
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  2. Yan Zhou
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  3. Honghui Wang
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  4. Dongqin Bi
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Correspondence to Weihua Yang.

Additional information

Published in Russian in Elektrokhimiya, 2009, Vol. 45, No. 7, pp. 853–857.

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Yang, W., Zhou, Y., Wang, H. et al. Studies on the influence of various experimental conditions on electrochemical generation of ferrate(VI) in NaOH-KOH mixed electrolyte. Russ J Electrochem 45, 795–799 (2009). https://doi.org/10.1134/S1023193509070131

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  • DOI: https://doi.org/10.1134/S1023193509070131

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