The cyclic voltammetric study of ferrate(VI) production

Bouzek, Karel; Roušar, I.; Bergmann, Henry; Hertwig, Klaus

doi:10.1016/s0022-0728(96)04939-x

Cited by 63 publications

(64 citation statements)

References 24 publications

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“…The ring electrode for the experiments on a rotating ringdisk electrode was made of platinum. Its potential was held at a value corresponding to the FeO 4 2-reduction, i.e., at 300 mV [9,10]. The results are related to an HgO/Hg reference electrode with 14 M NaOH as the internal electrolyte.…”

Section: Methodsmentioning

confidence: 99%

The influence of electrolyte composition on electrochemical ferrate(VI) synthesis. Part III: anodic dissolution kinetics of a white cast iron anode rich in iron carbide

Mácová

Bouzek

2012

J Appl Electrochem

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The anolyte composition and process temperature could improve the kinetics of iron anode dissolution and subsequent ferrate(VI) production significantly. This also holds for the anode composition. Following pure iron and silicon-rich steel (SRS), white cast iron (WCI) was the last representative of anode material tested that is typically used to produce ferrate(VI). Using anolytes 14 M NaOH, 14 M KOH, and mixtures thereof, the systems were studied by potentiodynamic methods, electrochemical impedance spectroscopy, and batch electrolysis experiments. Additionally, metallographic analysis of the material was performed. The dissolution kinetics increases with increasing temperature and also, at 60°C, with increasing K ? content in the anolyte, but less progressively than in the case of SRS. Similar to SRS, WCI also easily dissolves into ferrate(VI) even at 20°C in pure NaOH, thus indicating the inferior protective properties of oxo-hydroxide surface layers. In general, a maximum current efficiency of approx. 60 % was obtained at 60°C in pure KOH solution. The authors conclude that, at 60°C, the high efficiency of the synthesis is caused by the low protective properties of the oxo-hydroxide surface layer caused by the preferential dissolution of cementite and at the same time by the precipitation of the potassium salt of the product in the electrolyte immediately after its formation. This minimizes the effect of its decomposition.

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Section: Methodsmentioning

confidence: 99%

The influence of electrolyte composition on electrochemical ferrate(VI) synthesis. Part III: anodic dissolution kinetics of a white cast iron anode rich in iron carbide

Mácová

Bouzek

2012

J Appl Electrochem

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“…Consequently, the detection of O 2 by the ME proves that O 2 is released from Fe 2 O 3,NW during the process causing the signal C4. Since the redox processes corresponding to the peaks C4/A3 are related [14,18,54,67], the TSV-SECM reveals that the Fe 2 O 3,NW sample continuously evolves oxygen from +0.1 V onwards, i.e.…”

Section: Peak Assignment Using Tsv-secmmentioning

confidence: 99%

Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy

Bülter

Denuault

Mátéfi‐Tempfli

et al. 2016

Electrochimica Acta

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“…Furthermore, at this potential the current flow was on a plateau, suggesting negligible oxygen generation. 28 While the thermodynamic fields show which phases are stable, the actual behavior will depend on a wide range of chemical, kinetic and hydrodynamic factors at the interface.…”

Section: Methodsmentioning

confidence: 99%

Polycrystalline iron and mild steel surfaces in caustic solution

Costine

Thurgate

Thornber

et al. 2007

Surface & Interface Analysis

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Combined ultrahigh vacuum-electrochemical (UHV-EC) methods were utilized to expose polycrystalline iron and mild steel surfaces to 0.01 M NaOH and for the subsequent transfer back to the UHV analysis chamber without exposure to air. X-ray photoelectron spectroscopy (XPS) was then employed to elucidate a chemical description of the iron surfaces as a function of the emersion potential. The mild steel electrodes display lower corrosion resistance in the alkali solution, underlining a crucial role played by minor alloying components, such as sulfide and/or carbide. Carbonate, an unavoidable contaminant of caustic solutions, is strongly adsorbed to both iron surfaces, its concentration generally being unaffected by a subsequent water wash. Polycrystalline iron extracted in the soluble ferrate domain shows enhanced corrosion resistance, which is suspected to arise through surface impurity enrichment following the anodic leaching of the FeO 4 2− species. In contrast, mild steel extracted in the ferrate domain exhibits poor corrosion resistance, further highlighting the detrimental effect of certain alloying elements.

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The cyclic voltammetric study of ferrate(VI) production

Cited by 63 publications

References 24 publications

The influence of electrolyte composition on electrochemical ferrate(VI) synthesis. Part III: anodic dissolution kinetics of a white cast iron anode rich in iron carbide

The influence of electrolyte composition on electrochemical ferrate(VI) synthesis. Part III: anodic dissolution kinetics of a white cast iron anode rich in iron carbide

Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy

Polycrystalline iron and mild steel surfaces in caustic solution

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