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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Voltammetric and microgravimetric studies of the anions influence in the underpotential deposition of cadmium on policrystalline gold electrodes

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Author(s):
Mauro C. Santos [1] ; Douglas W. Miwa [2] ; Sérgio A. S. Machado [3] ; Luis A. Avaca [4]
Total Authors: 4
Affiliation:
[1] Universidade de São Paulo. Instituto de Química de São Carlos
[2] Universidade de São Paulo. Instituto de Química de São Carlos
[3] Universidade de São Paulo. Instituto de Química de São Carlos
[4] Universidade de São Paulo. Instituto de Química de São Carlos
Total Affiliations: 4
Document type: Journal article
Source: Química Nova; v. 24, n. 4, p. 465-472, 2001-08-00.
Abstract

Cadmium UPD on Au was studied by voltammetric and microgravimetric measurements. In the oxide formation/reduction potential region, a mass increasing/decreasing of 32 ng cm-2 was associated to incorporation/elimination of one oxygen per active site. The modifications promoted in the voltammetric and mass profiles by 10-5 M Cd(ClO4)2 are restricted to potentials more negative than 0.4 V. After a 120 s potential delay at 0.05 V, the positive sweep reveals an anodic peak with charge of 40 muC cm-2 and mass decrease of 22 ng cm-2, associated to Cd ads dissolution. Sulphate or chloride was added to the solution without significant influence, due to the low coverage with Cd or anions. (AU)