Lead deposition onto fractured vitreous carbon: influence of electrochemical pretreated electrode

Sosa, E.; Carreño, Gilberto; Ponce-de-León, C.; Oropeza, Mercedes T.; Morales, M. Fernandez; González, Ignacio; Batina, Nikola

doi:10.1016/s0169-4332(99)00362-1

Cited by 12 publications

(13 citation statements)

References 20 publications

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“…Although, as well pointed out in one of the previously published papers, RMS[Rq] has not been established as a rigorous quantitative measure of the surface roughness and the surface quality, it has often been used for such purpose. Apparently, it is one of the simplest morphology parameters that can be used for the surface quality description. ,,− For HOPG-electrodes, we found that the average [RMS]Rq is 0.58 ± 0.07 nm, which is also sufficiently close to the previously reported value …”

Section: Resultssupporting

confidence: 89%

“…Contrary to the smooth and somehow homogeneous (in terms of morphology) surface of the HOPG-electrodes, the AFM image in Figure b revealed a large number of rather small features randomly distributed all over the FVC-electrode surface. The FVC surface was described more quantitatively in one of our previous papers . Therefore, we would like to mention that the nodular surface features are of rectangular or ellipsoidal shape with the following dimensions: 120−150 nm by 65 nm.…”

Section: Resultsmentioning

confidence: 99%

“…This work is a part of our long-time effort to investigate the details of the metal deposition mechanism and their visualization by SPM techniques. See our recently published papers about the influence of roughness and fractality of the electrode surface on the efficiency of the lead deposition onto differently pretreated vitreous carbon, refs and , or the influence of the concentration of active species on the deposition mechanism, refs and .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Silver Electrocrystallization onto Carbon Electrodes with Different Surface Morphology: Active Sites vs Surface Features

2001

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The influence of the electrode surface quality and surface morphology on the silver electrocrystallization process onto a carbon substrate from 10 -2 M Ag(NH 3 ) 2 + /1.6 M NH 3 , 1 M KNO 3 (pH ) 11) electrolyte solution was studied. Three substrates with different types of surface morphology and surface roughness were used: highly oriented pyrolitic graphite (HOPG), mechanically polished vitreous carbon (MPVC), and fractured vitreous carbon (FVC). Before the silver deposition process, the electrode surface was examined and characterized by means of Atomic Force Microscopy (AFM) analysis. Evaluation of the kinetic parameters of the silver nucleation and the growth behavior, as well as other characteristics of the silver electrocrystallization process onto carbon substrates, were based on cyclic voltammetry and chronoamperometric measurements. Cyclic voltammetry data also show that silver deposition efficiency is proportional to the increase of electrode surface roughness (from HOPG, via MPVC to FVC). The silver bulk deposition process on all three carbon substrates was characterized as 3D nucleation and diffusion-controlled growth. However, this process proceeds with different overpotentials on different substrates: the lowest for HOPG and the highest for MPVC electrode surface. The major electrocrystallization parameters, such as nucleation rate, number of active sites, and number of formed silver nuclei, strictly related to the electrode surface conditions, seem to not follow the same trends as the cyclic voltammetry data. It is clearly indicated in the nonlinear relationship between number of active sites and the surface features (recognized in AFM images). As pointed out in the discussion, it opens new questions regarding the nature of the active sites for deposition on the electrode surface and their identification by microscopic techniques.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Silver Electrocrystallization onto Carbon Electrodes with Different Surface Morphology: Active Sites vs Surface Features

2001

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“…The analysis was based on a calculation of a standard deviation of all height values within the given (imaged) area, and expressed as the root-mean-square RMS[Rq] average of the surface roughness factor. For more details, see previous literature on roughness measurement by AFM. − Results show that for the majority of films (C1, JU, TC, and Y3) RMS[Rq] is in the narrow range from 3.40 to 4.67 nm. In comparison with recent data by Lord and Buckley 26 the films are less rough as the asphaltene patches on mica reported to be about 8 nm.…”

Section: Resultsmentioning

confidence: 97%

AFM Characterization of Organic Deposits on Metal Substrates from Mexican Crude Oils

et al. 2003

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Atomic force microscopy (AFM) has been used to investigate eight different Mexican crude oils in the form of deposited films on metal substrate. Most oils had reported asphaltene deposition problems during production. Two other techniques related to hydrodynamic size determination were applied: light scattering and HPLC-SEC. According to the observed AFM surface morphology characteristics oil films were classified and grouped into distinct groups. Some had dense population of 40-200 nm particles, while others had larger discoid features and smaller particles. Light scattering analysis indicates observed particles to be organic as they disappear upon dilution with toluene. Correlation between the oil film AFM morphology and physicochemical properties of the oil did not reveal a simple relationship. Indeed, oils with similar bulk fluid properties show different morphology as films. With respect to the crude oil instability and the well-deposition problem, it was found that five of the investigated oils (unstable) with known problems of asphaltene deposition during production, contain spherical or discoid nanoparticles in the range of 35 to 500 nm. Films prepared from the stable oils possess apparent two-dimensional (2D) characteristics (spread over the substrate) without particular features. Detail of AFM analysis show that oil instability can be related to films and oils with higher density of particles, and films with larger particles. It emphasizes AFM, as a technique potentially useful for the welldeposition problem detection. HPLC-SEC data show that oils from similar geographic zones have similar fluid properties in terms of composition and hydrodynamic size distribution but on the other hand could display different AFM morphology features. The results show that AFM is a promising tool for the oil film characterization and determination of surface properties, which may leads to development of a better understanding of well-deposition and adherence.

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“…This difference can be attributed to the fact that, in addition to mechanical polishing and ultrasonication, our GC surface was electrochemically treated as described in the Experimental Methods. Metal electrodeposition on such a modified GC surface , exhibits different behavior compared to that of typically prepared GC surface. − …”

Section: Resultsmentioning

confidence: 99%

Copper Electrodeposition from Deep Eutectic Solvents—Voltammetric Studies Providing Insights into the Role of Substrate: Platinum vs Glassy Carbon

2020

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We report on the effect of the substrate on electrochemical deposition of Cu from deep eutectic solvent ethaline. We investigated the polarization behavior during electrodeposition of Cu on Pt and glassy carbon (GC) from both Cu 2+ and Cu + containing ethaline using cyclic voltammetry (CV). Formation of bulk Cu deposits on both substrates underwent nucleation and growth processes; however, the nucleation was considerably sluggish on GC compared to Pt. While experiments in Cu + solutions indicated that coalescence of Cu islands on Pt is a slow process and that its surface may not be fully covered by Cu, such determination of Cu coverage could not be made on GC. Cu dissolution is also slower from GC than from Pt. It was observed that CV of Cu deposition on GC is influenced by the surface preparation method. Since ethaline has high chloride concentration, a parallel study in aqueous 3 M NaCl solution was conducted in order to examine the influence of the chloride medium on the electrodeposition process. This revealed that electrodeposition in both media occurred in the same manner but with different charge and mass transfer rates caused by the differences in viscosity and chloride concentrations of the two solutions.

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Lead deposition onto fractured vitreous carbon: influence of electrochemical pretreated electrode

Cited by 12 publications

References 20 publications

Silver Electrocrystallization onto Carbon Electrodes with Different Surface Morphology: Active Sites vs Surface Features

Silver Electrocrystallization onto Carbon Electrodes with Different Surface Morphology: Active Sites vs Surface Features

AFM Characterization of Organic Deposits on Metal Substrates from Mexican Crude Oils

Copper Electrodeposition from Deep Eutectic Solvents—Voltammetric Studies Providing Insights into the Role of Substrate: Platinum vs Glassy Carbon

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