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

Sosa, Eliceo, Carreño, Gilberto, Ponce de Leon, Carlos, Oropeza, Mercedes, Morales, Miguel, González, Ignacio and Batina, Nikola (2000) Lead deposition onto fractured vitreous carbon: influence of electrochemical pretreated electrode Applied Surface Science, 153, (4), pp. 245-258. (doi:10.1016/S0169-4332(99)00362-1).

Record type: Article

Abstract

We evaluated the electrochemical deposition of Pb(II) onto Fractured Vitreous Carbon (FVC) electrodes from solutions containing very low concentrations of lead in different electrolytes (sulfate or chloride). To examine how the FVC surface state influences the lead deposition efficiency, the electrodes were subjected to different electrochemical pretreatments prior to the actual deposition process. The FVC electrode was used as a representative model of the vitreous carbon (VC) bulk, avoiding the polishing procedure that could change the surface. Electrochemical pretreatment was carried out by cyclic voltammetry in electrolytes containing chloride or nitrate anions and in some cases, ferrocyanide. Before and after the electrochemical pretreatment, the electrode surface morphology was assessed using Atomic Force Microscopy (AFM) imaging. The quantity of lead deposited on the FVC electrode surface (lead deposition efficiency) in each experiment was estimated from the charge under the lead anodic, dissolution peak. Electrochemical pretreatment of electrodes in chloride or nitrate electrolytic baths consistently reduced the lead deposition efficiency. A detailed analysis, correlating lead deposition efficiencies to surface roughness and fractal dimension of the freshly prepared and electrochemically pretreated FVC electrodes, indicated that the decrease in efficiency corresponded to the change in electrode surface geometry. The greater efficiency of lead deposition observed in the chloride-containing electrolyte was due to the interaction between chloride and deposited lead rather than a chloride interaction with the FVC substrate.

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More information

Submitted date: 29 May 1999
Published date: 2000
Keywords: Electrochemical pretreatment, Lead deposition, Vitreous carbon electrodes
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 54142
URI: http://eprints.soton.ac.uk/id/eprint/54142
ISSN: 0169-4332
PURE UUID: 3d43ec15-ca33-4ea7-b658-a6104582896b

Catalogue record

Date deposited: 01 Aug 2008
Last modified: 17 Jul 2017 14:36

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Contributors

Author: Eliceo Sosa
Author: Gilberto Carreño
Author: Mercedes Oropeza
Author: Miguel Morales
Author: Ignacio González
Author: Nikola Batina

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