Voltammetric and in situ FTIRS study on CN- and Au(CN)-x complexes at the polycrystalline gold surface in citrate medium
Please use this identifier to cite or link to this item:
http://hdl.handle.net/10045/7807
Title: | Voltammetric and in situ FTIRS study on CN- and Au(CN)-x complexes at the polycrystalline gold surface in citrate medium |
---|---|
Authors: | Huerta Arráez, Francisco | Mele, Claudio | Bozzini, Benedetto | Morallon, Emilia |
Research Group/s: | Electrocatálisis y Electroquímica de Polímeros |
Center, Department or Service: | Universidad de Alicante. Departamento de Química Física | Universidad Politécnica de Valencia. Departamento de Ingeniería Textil y Papelera | Università di Lecce. Dipartimento di Chimica Fisica Applicata |
Keywords: | Citrate | Gold | FTIR spectroscopy | Gold cyanocomplex | Cyclic voltammetry |
Knowledge Area: | Química Física | Ciencia de Materiales |
Date Created: | 17-Feb-2004 |
Issue Date: | 25-Mar-2004 |
Publisher: | Elsevier |
Citation: | HUERTA ARRÁEZ, Francisco, et al. "Voltammetric and in situ FTIRS study on CN- and Au(CN)-x complexes at the polycrystalline gold surface in citrate medium". Journal of Electroanalytical Chemistry. Vol. 569, Issue 1 (15 July 2004). ISSN 0022-0728, pp. 53-60 |
Abstract: | The adsorption and reactivity of citrate anions, cyanide anions, and the Au(I) and Au(III) cyanocomplexes (KAu(CN)2 and KAu(CN)4, respectively) on gold polycrystalline electrodes have been investigated by means of cyclic voltammetry and in situ FTIR spectroscopy in pH 7 sodium citrate medium. It was found that citrate anion adsorbs reversibly through the carboxylate groups from 0.4 V (RHE) on bare gold surfaces. However, the onset of this adsorption process is shifted by 600 mV in the positive direction when adsorbed cyanide species are present at the electrode surface. The Au(I) cyanocomplex produces a film on the gold electrode that inhibits the oxidation of both citrate anions and the gold surface. The reduction of the Au(III) cyanocomplex gives rise to the formation of the Au(I) cyanocomplex at potentials less negative than those required for gold deposition. Upon reduction, both cyanocomplexes release adsorbed cyanide on the gold electrode, which can be subsequently oxidized to cyanate at higher potentials. |
Sponsor: | Generalitat Valenciana (GV01-313); Ministerio de Ciencia y Tecnología (MAT2001-1007). |
URI: | http://hdl.handle.net/10045/7807 |
ISSN: | 0022-0728 |
DOI: | 10.1016/j.jelechem.2004.02.013 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Peer Review: | si |
Publisher version: | http://dx.doi.org/10.1016/j.jelechem.2004.02.013 |
Appears in Collections: | INV - GEPE - Artículos de Revistas |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Journal of Electroanalytical Chemistry 569 (2004) 53–60.pdf | Versión final (acceso restringido) | 254,11 kB | Adobe PDF | Open Request a copy |
pruebas_CN.pdf | Versión revisada (acceso libre) | 256,79 kB | Adobe PDF | Open Preview |
Items in RUA are protected by copyright, with all rights reserved, unless otherwise indicated.