Voltammetry study of Cr(III)/Cr(II) system in methanesulfonate and sulfate solutions: Temperature dependences

Китык, А.А.; Protsenko, V. S.; Данилов, Ф. И.

doi:10.1016/j.jelechem.2012.10.003

Cited by 8 publications

(2 citation statements)

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“…One can notice that raising the temperature results in a gradual increase in j p values for cathodic peaks (I, II). This behavior is due to the increase of mass transfer rate [38]. Also, a shift to more positive potentials for both cathodic peaks is observed.…”

Section: Effect Of Temperaturementioning

confidence: 75%

“…By calculating D Cr 3+ at different temperatures (30, 50, and 70 o C) based on data from Fig. 3b and equa- tion 5, the activation energy of Cr 3+ species diffusion (E D ) of value 4.3 kJ mol -1 and the pre-exponential factor (A D ) of value 1.7 cm 2 s -1 were deduced using equation 6 [38] from slope and intercept of ln (D Cr3+ ) vs.T -1 plot, respectively. (6)…”

Section: Effect Of Temperaturementioning

confidence: 99%

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Factors Affecting Nucleation and Growth of Chromium Electrodeposited from Cr3+ Electrolytes Based on Deep Eutectic Solvents

El-Hallag

Moharram

Darweesh

et al. 2020

J. Electrochem. Sci. Technol

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Chromium was electrodeposited from deep eutectic solvents-based Cr 3 + electrolytes on HB-pencil graphite electrode. Factors influencing the electrochemical behavior and the processes of Cr nucleation and growth were explored using cyclic voltammetry and chronoamperometry techniques, respectively. Cr 3 + reduction was found to occur through an irreversible diffusion-controlled step followed by another irreversible one of impure diffusional behaviour. The reduction behavior was found to be greatly affected by Cr 3 + concentration, temperature, and type of hydrogen bond donor used in deep eutectic solvents (DESs) preparation. A more comprehensive model was suggested and successfully applied to extract a consistent data relevant to Cr nucleation kinetics from the experimental current density transients. The potential, the temperature, and the hydrogen bond donor type were estimated to be critical factors controlling Cr nucleation. The nucleation and growth processes of Cr from either choline chloride/ethylene glycol (EG-DES) or choline chloride/urea (U-DES) deep eutectic solvents were evaluated at 70 o C to be three-dimensional (3D) instantaneous and diffusion-controlled, respectively. However, the kinetics of Cr nucleation from EG-DES was found to be faster than that from U-DES. Cr nucleation was tending to be instantaneous at higher temperature, potential, and Cr 3 + concentration. Cr nuclei electrodeposited from EG-DES were characterized at different conditions using scanning electron microscope (SEM). SEM images show that high number density of fine spherical nuclei of almost same sizes was nearly obtained at higher temperature and more negative potential. Energy dispersive spectroscopy (EDS) analysis confirms that Cr deposits were obtained.

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Section: Effect Of Temperaturementioning

confidence: 75%

Section: Effect Of Temperaturementioning

confidence: 99%