Comparative study of nucleation and growth mechanism of cobalt electrodeposited on ITO substrate in nitrate and chloride electrolytes

Bahar, Jihane; Lghazi, Youssef; Youbi, Boubaker; Himi, Mohammed Ait; Bimaghra, I.

doi:10.1007/s10008-021-04961-7

Cited by 20 publications

(4 citation statements)

References 37 publications

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“…In agreement with the 3D nucleation model of Scharifker and Hills (Bahar 2021), the plot (i/i max ) 2 vs. (t/t max ) (Fig. 4, insert) establishes that cobalt adopts instantaneous nucleation process on the steel substrate within the first few seconds, involving rapid growth of nuclei at many active sites, which fill up as soon as potential is applied.…”

Section: Details On the Preparation Of The Thin Films Of Cobalt And C...supporting

confidence: 84%

Electrocatalytic activity of electrodeposited CoOx thin film on low-carbon unalloyed steel substrate toward electrochemical oxygen evolution reaction (OER)

et al. 2023

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In this study, we report elaboration of a thin film of CoO x on a low carbon unalloyed steel substrate by electrochemical route and the study of its electrocatalytic performances with respect to the evolution reaction of oxygen (OER) in NaOH medium. The elaborated deposits were well-characterized using X-ray diffraction. Kinetic and thermodynamic parameters such as exchange current density, Tafel slope, reaction order with respect to OH– ions and apparent activation energy were studied. The CoO x displays satisfactory OER performance in an alkaline medium, with a low overvoltage of 362 mV at 10 mA/cm 2 and a Tafel slope of 81 mV/dec at 293 K. The apparent kinetic activation energy (= 29.79 kJ/mol) was similar to those obtained for the reported catalytic electrode materials. The O 2 gas obtained on the cobalt oxide electrode was 2.865 mmol/s.cm 2 , which is 28 times higher than that obtained for the platinum electrode (0.102 mmol/s.cm 2 ). Chronoamperometry demonstrates a better electrochemical stability under a polarization potential of 2 V in 1 M NaOH for nearly 25 h. The low cost, the high OER performance, as well as the good stability of the CoOx electrode make it a promising candidate for the industrial-scale water electrolysis.

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Section: Details On the Preparation Of The Thin Films Of Cobalt And C...supporting

confidence: 84%

Electrocatalytic activity of electrodeposited CoOx thin film on low-carbon unalloyed steel substrate toward electrochemical oxygen evolution reaction (OER)

et al. 2023

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“…1 depending on the composition of the solvent system. This characteristic peak shape has been reported for Co based solutions 29,30,48,50 and other metals 33,51 as the result of metal dissolution from the electrodeposit into the solution. However, to ensure that the oxidation of Co 2+ in solution to Co 3+ is not also present in this anodic process, CVs were conducted by scanning the potential in the positive potential sweep direction (Fig.…”

Section: Resultssupporting

confidence: 72%

Enhanced Electrochemical Properties of Cobalt by Varying the Ethylene Glycol - Choline Chloride Composition in a Deep Eutectic Solvent Mixture

Perera,

Pringle,

Periyapperuma

et al. 2023

J. Electrochem. Soc.

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The increased demand for portable electronic devices and electric vehicles has resulted in an exponential increase in lithium-ion battery (LIB) waste, and becoming in turn an important secondary source for critical metals. Electrowinning is a commonly used method to recover base and precious metals from a solution, which can also be used to recover valuable metals from spent LIBs. This study unveiled the cobalt electrochemical recovery using model Co sources in increasing amounts of ethylene glycol (EG), 67 molar %, 82 molar % and 100 molar %, in a mixture with choline chloride. The electrochemical results show that increasing the amount of EG together with a small concentration of sulfate anions, in conjunction with chloride anions, in the solution mixture favours the reduction of Co2+. This improved electrochemistry seems to be related to changes of Co2+ speciation easing the reduction process. Additionally, the nature of the Co salt has a significant impact on the recovery efficiency, morphology, and purity of the Co electrodeposit. This work will underpin the science to design safe electrolyte mixtures to enhance the electrochemical recovery of Co2+ in solution from secondary sources.

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“…[ 36 ] The nucleation mechanism was identified using the theoretical model proposed by Scharifker and Hills, plotting dimensionless curves (( j / j max ) 2 vs t / t max ) and comparing them with the experimental data to determine whether the 3D nucleation process is instantaneous or progressive, both controlled by diffusion. [ 37 ] These curves are generated from chronoamperometric curves, j – t transients, where t max is the time corresponding to maximum current ( j max ). The model uses the following equations to identify the nucleation processes.…”

Section: Resultsmentioning

confidence: 99%

Antimony Selenide Thin Films by Electrodeposition: Influence of Deposition Conditions and Post‐Deposition Thermal Treatment on Physical and Photoelectrochemical Properties

García

Cerdán‐Pasarán

Madrigal

2022

Physica Status Solidi (a)

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Herein, Sb2Se3 thin films are obtained by the electrodeposition technique from a single bath on fluorine‐doped tin oxide (FTO) substrates. The electrodeposition conditions such as precursor concentration and applied potential, as well as the annealing temperature, and its influence on the structural, morphological, optical, and photoelectrochemical properties are analyzed. From the cyclic voltammetry measurements, the range of deposition potential is established and from the sweep rate variation, an irreversible and diffusion‐controlled process is assumed. With the chronoamperometric curves, an instantaneous nucleation is concluded. The Se/Sb ratio variation of the precursor solutions demonstrate that the 0.7 ratio is optimal to obtain Sb2Se3 stoichiometric thin films. The conductivity decreases with the increase of the deposition potential, while the highest photosensitivity is obtained with the film deposited at −0.75 V versus the saturated calomel electrode. Regarding the annealing temperature, a compact homogeneous film is obtained in the range from 325 to 425 °C. Therefore, the suitable properties of Sb2Se3 films obtained by electrodeposition and the establishment of optimized deposition conditions for its use in photoelectrochemical cells (PECs) are demonstrated.

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Comparative study of nucleation and growth mechanism of cobalt electrodeposited on ITO substrate in nitrate and chloride electrolytes

Cited by 20 publications

References 37 publications

Electrocatalytic activity of electrodeposited CoOx thin film on low-carbon unalloyed steel substrate toward electrochemical oxygen evolution reaction (OER)

Electrocatalytic activity of electrodeposited CoOx thin film on low-carbon unalloyed steel substrate toward electrochemical oxygen evolution reaction (OER)

Enhanced Electrochemical Properties of Cobalt by Varying the Ethylene Glycol - Choline Chloride Composition in a Deep Eutectic Solvent Mixture

Antimony Selenide Thin Films by Electrodeposition: Influence of Deposition Conditions and Post‐Deposition Thermal Treatment on Physical and Photoelectrochemical Properties

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