Ferrate(VI) synthesis at boron-doped diamond anode

The electrochemical synthesis of ferrate(VI) by the oxidation of iron compounds from alkaline 10 M KOH electrolytes on a boron-doped diAMond electrode was exAMined by cyclic voltAMmetry between the potentials of the hydrogen evolution reaction and the oxygen evolution reaction. It was shown that the...

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Bibliographic Details
Published in:Journal of the Serbian Chemical Society 2013, Vol.78 (2), p.265-279
Main Authors: Cekerevac, Milan, Nikolic-Bujanovic, Ljiljana, Jokic, Anja, Simicic, Milos
Format: Article
Language:English
Subjects:
alkaline electrolyte
Anodes
Anodic polarization
Boron
Boron compounds
boron-doped diamond electrode
Chemical synthesis
cyclic voltammetry
Diamonds
Electrodes
Electrolytes
Ferrate(VI)
Hydrogen evolution reactions
Iron
Iron compounds
Oxidation
Oxygen evolution reactions
synthesis
UV-VIS spectrophotometry
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Summary:The electrochemical synthesis of ferrate(VI) by the oxidation of iron compounds from alkaline 10 M KOH electrolytes on a boron-doped diAMond electrode was exAMined by cyclic voltAMmetry between the potentials of the hydrogen evolution reaction and the oxygen evolution reaction. It was shown that the anodic current peak that appeared in iron-free electrolyte at a less positive potential than the potential of the oxygen evolution probably coincides with oxidation of hydrogen in >CH2 groups and C-sp2 graphite impurities with formation of >C=O groups in a C-sp3 diAMond structure. Addition of Fe(III) compounds to the electrolyte provoked the formation of an anodic wave on the cyclic voltAMmogrAMs in the potential region that correlates with the generation of ferrate(VI). It is concluded that the direct electrochemical synthesis of Fe(VI) at a boron-doped diAMond anode is possible because of the less positive potential of ferrate(VI), FeO42-, formation with respect to the potential of the oxygen evolution reaction. The presence of ferrate(VI) in the electrolyte, formed after anodic polarization of the boron electrode in 10 M KOH electrolyte saturated with Fe(III) at 0.9 V against Hg/HgO electrode, was proven by UV–Vis spectrometry.
ISSN:0352-5139
1820-7421
DOI:10.2298/JSC120309108C