Electrochemical studies of lead deposition from acidic ammonium acetate solutions on different substrates

Girgis, Magdy; Ghali, Edward; Wiȩckowski, Andrzej

doi:10.1016/0013-4686(86)87035-9

Cited by 10 publications

(3 citation statements)

References 30 publications

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“…Pb perchlorate was selected as a proper precursor since lead acetate leads to the formation of lead oxide acetate [15], one of the impurities on electrode when dried under air at room temperature.…”

Section: Pb Electrode Preparationmentioning

confidence: 99%

Formic Acid from Carbon Dioxide on Nanolayered Electrocatalyst

Kwon

Lee

2010

Electrocatal

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Formic acid is electrochemically generated from carbon dioxide (CO 2 ) on nanolayered lead (Pb) electrode.Stepwise potential deposition method is applied to prepare nanostructured Pb, composed of particles and platelets with hexagonal and cubic crystallinities. Their electrocatalytic activities in an electroreduction of CO 2 are compared. We observed higher faradaic efficiencies of 94.1% on a cubic Pb surface than that of polycrystalline Pb smooth films (52.3%) at 278 K. Analyzing the mass changes of the electrodes by electrochemical quartz crystal microbalance, the mechanistic origin of CO 2 reduction is studied, and the indirect reduction of CO 2 via H ad atoms might be more reasonable than the direct electron transfer of CO 2 molecules.

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Section: Pb Electrode Preparationmentioning

confidence: 99%

Formic Acid from Carbon Dioxide on Nanolayered Electrocatalyst

Kwon

Lee

2010

Electrocatal

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“…The investigation of this system at ambient temperature was carried out using different electrochemical techniques ( 17). To obtain more information about the cathodic process we tried to study the effect of elevated temperature on the system.…”

Section: Introductionmentioning

confidence: 99%

“…Graphite and saturated calomel electrodes served as auxiliary and reference electrodes, respectively. The preparation of electrodes and the electrochemical set up are described in previous studies (15,17).…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on cyclic voltammograms during the electrodeposition of lead

Girgis¹,

Ghali²

1989

Can. J. Chem.

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MAGDY GIRGIS and EDWARD GHALI. Can. J. Chem. 67, 130 (1989). The electrochemical behavior of lead deposition process in a temperature range between 25 and 75°C was studied in a medium of lead chloride and ammonium acetate by linear and cyclic sweep perturbation. The study was undertaken on four substrates: Pb, Cu, Ag, and C. An increase in temperature resulted in accelerating the deposition process and promoted dendrite formation. Moreover, different kinetic parameters such as adsorption isotherms, Tafel slopes, and diffusion coefficient were affected as a function of temperature elevation. Surface analytical study performed by Auger electron spectroscopy revealed an increase in peak intensities of C1 and Pb as the temperature increased.Key words: electrodeposition, cyclic voltammetry, potentiostatic transients, underpotential deposition, temperature effect. IntroductionThe use of stationary electrode voltammetry in qualitative and quantitative investigations of electrolysis mechanisms has been extensive (1 -3), particularly in the field of electrocrystallization (4, 5). Considerable difficulties arise in the electrochemical studies of metal deposition due to the complex structure of the underlying metal (6) which lead to poor reproducibility, particularly in the appearance and structure of the deposits (7). There have been several studies of electrodeposition of lead (8-1 1).The choice of the acidified ammonium acetate bath was based on previous studies carried out in our laboratory (12)(13)(14) to investigate the dissolution of galena in different media. The results showed that the anodic passivation caused mainly by lead chloride formation is reduced in acetate medium due to the strong activity of ammonium acetate in dissolving PbC12.In the frame work of this approach, other studies (15, 16) have been undertaken to study lead deposition process from these media in order to find the optimum conditions necessary to obtain the metal directly from the sulphide ore. The investigation of this system at ambient temperature was carried out using different electrochemical techniques ( 17). To obtain more information about the cathodic process we tried to study the effect of elevated temperature on the system. To our knowledge, the effect of temperature on the behaviour of lead ions during the deposition process has not been reported in literature. This paper, therefore, has been intended to shed some light on the reaction mechanism during the deposition process in acetate medium as a function of temperature by employing the techni-

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