Growth of passive layers on nickel during their voltammetric anodic dissolution in a weakly acid medium

Gregori, Joan; Garcı́a-Jareño, J.J.; Giménez-Romero, David; Vicente, F.

doi:10.1016/j.electacta.2006.05.051

Cited by 12 publications

(15 citation statements)

References 54 publications

(104 reference statements)

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“…Mostly, a physical magnitude related with the chemical reaction advance is measured to be converted into number of mols reacting or produced. Mass changes due to the adsorption/desorption of different substances, − concentration of different chemicals near the surface, , reflectance or absorbance changes, − electrical current passing through an electrode, , the use of molecular beams for kinetic measurements, ion mass spectrometry, or following the structural changes with scanning electron microscopy are some of these possibilities.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Surface Chemical Reactions from a Digital Video

et al. 2020

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In the last few years, the color analysis of the studied surface has been regarded as a nonexpensive way to obtain not only the spectrochemical data but also the spatiotemporal information of the entire surface. Mean color intensities and standard deviation calculated from the red, green, and blue color histograms of digital images of surfaces have been considered particularly useful for the chemical understanding of surface kinetics. The shape of curves, the maximum of peaks, or the halfpeak widths depend on the kinetic constants and on the kinetic order of the surface chemical process. Some strategies used for obtaining the kinetics from RGB color intensities and their standard deviations are proposed.

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Section: Introductionmentioning

confidence: 99%

Kinetics of Surface Chemical Reactions from a Digital Video

et al. 2020

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“…Nickel has been the subject of many investigations related to dissolution and passivation mechanism in acid medium by means of different electrochemical techniques, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] mainly cyclic voltammetry [4][5][6][7][8][9][10][11][12][13] and electrochemical impedance spectroscopy. [14][15][16][17][18][19][20] The use of other nanolectrochemical techniques such as scanning tunneling microscopy ͑STM͒ in situ during dissolution processes of Ni metal electrodes in different aqueous media has been revealed as a very useful tool in the characterization of the interface processes that take place at the electrode surface.…”

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confidence: 99%

Anodic Dissolution of Nickel across Two Consecutive Electron Transfers

Gregori¹,

Garcı́a-Jareño

Giménez-Romero³

et al. 2007

J. Electrochem. Soc.

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The analysis of the electrochemical quartz crystal microbalance and electrochemical impedance spectroscopy results are consistent with a nickel electrodissolution process limited by the passage of Ni͑I͒ to Ni͑II͒, when chloride ions are present in the acid sulfate medium, or by the passage of Ni͑II͒ to Ni 2+ in solution, in absence of chloride. This interpretation allows an explanation of the potential evolution of Fdm/dQ values in both experimental conditions by assuming the formation of a new phase on the electrode surface with a gel-like structure placed between the metal and the solution. Ni͑I͒ surface concentration is calculated from the instantaneous mass/charge Fdm/dQ values.

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“…A decrease in mass is observed during the anodic potential sweep; larger in the active than in the passive potential region of Ni. A decrease in mass during anodic polarization has been reported to occur in slightly acidic sulphate solutions [18,19], slightly acidic solutions containing sulphate, borate and chloride ions [20,21], and even in alkaline (pH 12) sulphate solution [18].…”

Section: Cyclic Voltammetry and Eqcn Frequency Measurementsmentioning

confidence: 98%