ChemInform Abstract: INVESTIGATIONS OF COPPER IN AQUEOUS ALKALINE SOLUTIONS BY CYCLIC VOLTAMMETRY

Ambrose, J. R.; Barradas, R.G.; Shoesmith, D.W.

doi:10.1002/chin.197347029

Cited by 22 publications

(52 citation statements)

References 1 publication

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“…Thus the electrode surface is assumed to be covered with Zn(OH)z layer before the potential scan. Comparing the anodic peaks recorded at potentials > -1.00V for e-brass (in this study) with those reported previously for copper shows that: (a) peak A~ corresponds to the formation of a Cu(OH) film [29][30][31]; (b) peak (or shoulder) A2 is assumed to be due to transformation of Cu(OH) to Cu20 [29]; (c) peak A2 is related to the formation of a Cu(OH)2 or CuO layer [29,30,32]; and (d) peak A 3 (shown only in highly alkaline solutions) is attributable to the oxidation of Cu(II) species to Cu(III) species [33,34].…”

Section: Cyclic Voltammetrymentioning

confidence: 91%

“…The cathodic peaks are interpreted as: (a) Peak C1, corresponding to the reduction of Cu(II) species to Cu(I) [29][30][31]; (b) Peak C2, including the reduction of Cu(I) species to Cu(O) [29,[32][33][34][35]; (c) Peak C4, connected with the reduction of Zn(II) species to Zn(O); [27,28] and (d) Peak C3, corresponding to the reduction of Cu(III) species to Cu(II), usually observed for copper [32,35] but which does not appear clearly in the cyclic voltammograms depicted in Figs. 1, 2.…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

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Passivity of ?-brass (Cu?Zn/67?33) and its breakdown in neutral and alkaline solutions containing halide ions

et al. 1991

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The passivation behaviour of e-brass (Cu : Zn = 67: 33) in alkaline solutions was studied using cyclic voltammetry and potentiostatic current transient measurements. The recorded cyclic voltammograms exhibited the main features usually observed for pure copper and zinc, and one additional anodic peak on the reverse potential scan. The height, sharpness and location of the different peaks depended greatly on the alkali concentration and the scan rate. The results show that the formation of Cu20 and Cu(OH)2 films proceed under ohmic resistance control following a dissolution-precipitation mechanism. The effect of F-, C1-and Br-ions on the passivity was also studied. The pitting potential was found to decrease with logarithm of halide ion concentration. The current transients in the absence and presence of halide ions were analysed. In the absence of pitting the current, after a few seconds, was found to increase linearly with the reciprocal of the square root of time while in the presence of pitting it was found to fit the Engell-Stolica equation.

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Section: Cyclic Voltammetrymentioning

confidence: 91%

Section: Cyclic Voltammetrymentioning

confidence: 99%

Passivity of ?-brass (Cu?Zn/67?33) and its breakdown in neutral and alkaline solutions containing halide ions

et al. 1991

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“…1) with a potential negative to the peak due to formation of Cu20 (peak 2). Peak 3 is generally associated with formation of Cu(II) species [11,13,19,20]. Peaks 4 and 5 correspond to the Cu(II)/Cu(III) redox couple [11,19].…”

Section: (I) Introductionmentioning

confidence: 99%

“…Ambrose et al [11] reported cyclic voltammograms of copper in 1 mol dm -3 KOH. A voltammogram similar to the one they published is shown in Fig.…”

Section: (I) Introductionmentioning

confidence: 99%

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Initial stages of anodic oxidation of polycrystalline copper electrodes in alkaline solution

Droog

1980

Journal of Electroanalytical Chemistry

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The first stages of the anodic oxidation of polycrystalline copper electrodes in NaOH solutions were studied by potential sweep voltammetry and ellipsometry. Formation of bulk Cu20 was found to be preceded by electrosorption of oxygen species, that occurs in two successive stages, each represented by a current peak, corresponding to a different submonolayer state with a different adsorption energy. This surface oxide was formed via random electrodeposition. The width of the first current peak indicates the presence of lateral attractive interactions in the chemisorbed layer. The surface layer did not show any ageing effect.

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A Study of Cu‐Rh Electrodeposition**

et al. 2022

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This manuscript reports the simultaneous electrodeposition of Cu and Rh from an aqueous nitrate solution. The early stages of nucleation and growth of the bimetallic layer were explored using techniques such as cyclic voltammetry and current transients. Non-dimensional Scharifker-Hills graphs showed the occurrence of diffusion-controlled three-dimensional nucleation and growth best described by the Volmer-Weber mechanism. Additionally, different ratios of CuÀ Rh electrodes were synthesized by varying the potential of deposition and the Rh content in the deposition bath. Characterization techniques including electron microscopy, x-ray diffraction, and x-ray photoelectron spectroscopy were employed to investigate the chemical composition and structure of the deposits. The results showed a higher amount of Cu 2 + species in the layer than Cu + /Cu 0 when a more negative potential was applied, and when Rh was present in high amounts in the deposition bath. The final morphology of the obtained material proved to be dependent on the deposition potentials and the Cu : Rh content, showing interdependency between the metals.

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ChemInform Abstract: INVESTIGATIONS OF COPPER IN AQUEOUS ALKALINE SOLUTIONS BY CYCLIC VOLTAMMETRY

Abstract: Die Kinetik und der Mechanismus der Kathoden‐ und Anodenprozesse an Cu‐ Elektroden in wäßriger KOH‐Lösung werden voltammetrisch untersucht.

Cited by 22 publications

References 1 publication

Passivity of ?-brass (Cu?Zn/67?33) and its breakdown in neutral and alkaline solutions containing halide ions

Passivity of ?-brass (Cu?Zn/67?33) and its breakdown in neutral and alkaline solutions containing halide ions

Initial stages of anodic oxidation of polycrystalline copper electrodes in alkaline solution

A Study of Cu‐Rh Electrodeposition**

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