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The oxidation of iron compounds from alkaline 10 M KOH electrolytes on a  boron doped diamond electrode is examined by cyclic voltammetry between the  potentials of hydrogen evolution reaction and oxygen evolution reaction, due  to ferrate(VI) electrochemical synthesis. It is shown that the anodic current  peak that appears in iron free electrolyte at a less positive potential than  the potential of oxygen evolution probably coincides with oxidation of  hydrogen in >CH2 groups and C-sp2 graphite impurities with formation of >C=O  groups at C-sp3 diamond structure. Addition of Fe(III) compounds to the  electrolyte provoke formation of the anodic wave on cyclic voltammograms in  the potential region which correlates with generation of ferrate(VI). It is  concluded that the direct electrochemical synthesis of Fe(VI) at the boron  doped diamond anode is possible because of the less positive potential of  ferrate(VI)FeO2-4 formation in respect to the potential of oxygen evolution  reaction. Presence of ferrate(VI) in electrolyte, formed after anodic  polarization of boron electrode in 10 M KOH electrolyte saturated with  Fe(III) at + 0.9 V against Hg|HgO electrode, has been proven by UV-VIS  spectrometry

Ferrate(VI) synthesis at boron-doped diamond anode