The electrochemical behaviour of RuO2-based mixed—oxide anodes in base

Burke, Loretta A.

doi:10.1016/0368-1874(80)80164-x

Cited by 3 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reactions of ruthenium oxide electrodes in alkaline solutions were studied by Burke and coworkers in 1980 [37,38]. In 1-molar NaOH the International Journal of Electrochemistry 9 OCP of RuO 2 is 0.91 V. We found 13 peaks of interest by using fast scan cyclic voltammetry ( Figure 13).…”

Section: Electrochemistry In Alkaline Solutionmentioning

confidence: 88%

“…The corresponding reduction peaks are 11 at 420 ± 67 mV and 12 at ≈ 87 ± 36 mV, respectively. At 639 ± 30 mV, the transition of Ru(III) → Ru(IV) takes place (peak 3) [24,37,38].…”

Section: Electrochemistry In Alkaline Solutionmentioning

confidence: 99%

“…This highly reversible redox reaction reflects Ru(VI) → Ru(VII). [24,37,38]. The existence of perruthenate (RuO 4 − ) was proved by in situ IR spectroscopy [29].…”

Section: Electrochemistry In Alkaline Solutionmentioning

confidence: 99%

See 2 more Smart Citations

The Redox Chemistry of Ruthenium Dioxide: A Cyclic Voltammetry Study—Review and Revision

Chalupczok¹,

Kurzweil²,

Hartmann³

et al. 2018

International Journal of Electrochemistry

View full text Add to dashboard Cite

By cyclic voltammetry at high scan rates, the electrochemical properties of RuO 2 in acidic and alkaline solutions were investigated in detail. Thirteen current peaks can be distinguished in sulfuric acid and sodium hydroxide. With respect to the pH sensitivity of RuO 2 electrodes, we considered charge calculations, peak currents, and apparent diffusion coefficients. The nature of the Ru(II) oxidation was clarified by Ru(I)−Ru(III) species.

show abstract

Section: Electrochemistry In Alkaline Solutionmentioning

confidence: 88%

“…The corresponding reduction peaks are 11 at 420 ± 67 mV and 12 at ≈ 87 ± 36 mV, respectively. At 639 ± 30 mV, the transition of Ru(III) → Ru(IV) takes place (peak 3) [24,37,38].…”

Section: Electrochemistry In Alkaline Solutionmentioning

confidence: 99%

See 1 more Smart Citation

The Redox Chemistry of Ruthenium Dioxide: A Cyclic Voltammetry Study—Review and Revision

Chalupczok¹,

Kurzweil²,

Hartmann³

et al. 2018

International Journal of Electrochemistry

View full text Add to dashboard Cite

show abstract

“…A large oxidation peak appears at about -1.05 V vs. SCE caused by re-oxidation of hydrogen gas trapped inside the nanoporous coating structure [6,23]. More important is, however, the oxidation peak at about +0.15 V vs. SCE indicating oxidation of Ru 4+ to Ru 6+ , which suggests formation of ruthenate ions, RuO4 2- [6,24,25]. The RuO4 2-formation is also observed in the first cycle of the reference sample, which is a consequence of that the cyclic voltammetry starts on the HER side.…”

Section: Morphological Structure Of Ruo2/ni Coatingsmentioning

confidence: 99%

Corrosion of ruthenium dioxide based cathodes in alkaline medium caused by reverse currents

Holmin

Näslund

Ingason

et al. 2014

Electrochimica Acta

View full text Add to dashboard Cite

A reverse current obtained during power shutdowns in industrial processes, such as chlor-alkali production or alkaline water electrolysis, is deleterious for hydrogen evolving ruthenium dioxide (Ru02) based cathodes. It has been observed that RuO2 coatings after a power shutdown, necessary for e.g. maintenance, are severely damaged unless polarization rectifiers are employed. In this work we show why these types of cathodes are sensitive to reverse currents, i.e. anodic currents, after hydrogen evolution. RuO2 coatings deposited on nickel substrates were subjected to different electrochemical treatments such as hydrogen evolution, oxygen evolution, or reverse currents in 8 M NaOH at 90 degrees C. Polarity inversion was introduced after hydrogen evolution to simulate the effect of reverse currents. Because of chemical interaction with hydrogen, a significant amount of the RuO2 coating was transformed into hydroxylated species during cathodic polarization. Our study shows that these hydroxylated phases are highly sensitive to electrochemical corrosion during anodic polarization after extended hydrogen evolution.

Funding Agencies|Swedish Research Council [2007-5059]; European Research Council under the European Communities/ERC [258509]; Swedish Research Council (VR) [642-2013-8020]; KAW Fellowship program

show abstract

“…On leave from the I Iniversity of Warsaw, 13ialystok 13ranch, Institute o f face was postulated to remain constant during the growth of the hydrous oxide layer by potential cycling; moreover, the compact layer area was considered to be almost exclusively responsible for the electrical double layer charge. Burke and Murphy investigated the behavior of thermally prepared compact oxide films of RuOz in a base [6]; they concluded that the low overpotential for the oxygen evolution reaction that was observed at this electrode was due to the formation of surface-bonded perruthenate species.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of hydroxide to oxygen at an electrode modified with a film containing palladium and iridium oxides

1990

View full text Add to dashboard Cite

Hydroxide is oxidized to oxygen at 0.7 V versus a saturated calomel electrode in a pH 11 solution at a glassy carbon electrode modified with a film containing palladium and iridium oxide. Although this converts to a value that is among the lowest of the reported overpotentials for this reaction, the utility for large-scale electrolyses is limited by the need to periodically reactivate the surface with an acid treatment. The reaction, however, has considerable promise for electroanalytical chemistry. Voltammetric working curves in the millimolar range are linear at slow scan rates; at 40 mV/s, the sensitivity is 241 mA/mol. The current is mass transport limited at a rotating disk electrode. A general mechanism, proposed in part on the basis of a Tafel plot, is presented.

show abstract

The electrochemical behaviour of RuO2-based mixed—oxide anodes in base

Cited by 3 publications

References 0 publications

The Redox Chemistry of Ruthenium Dioxide: A Cyclic Voltammetry Study—Review and Revision

The Redox Chemistry of Ruthenium Dioxide: A Cyclic Voltammetry Study—Review and Revision

Corrosion of ruthenium dioxide based cathodes in alkaline medium caused by reverse currents

Oxidation of hydroxide to oxygen at an electrode modified with a film containing palladium and iridium oxides

Contact Info

Product

Resources

About