Voltammetric and in situ FTIRS study on CN- and Au(CN)-x complexes at the polycrystalline gold surface in citrate medium
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http://hdl.handle.net/10045/7807
Títol: | Voltammetric and in situ FTIRS study on CN- and Au(CN)-x complexes at the polycrystalline gold surface in citrate medium |
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Autors: | Huerta Arráez, Francisco | Mele, Claudio | Bozzini, Benedetto | Morallon, Emilia |
Grups d'investigació o GITE: | Electrocatálisis y Electroquímica de Polímeros |
Centre, Departament o Servei: | 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 |
Paraules clau: | Citrate | Gold | FTIR spectroscopy | Gold cyanocomplex | Cyclic voltammetry |
Àrees de coneixement: | Química Física | Ciencia de Materiales |
Data de creació: | 17-de febrer-2004 |
Data de publicació: | 25-de març-2004 |
Editor: | Elsevier |
Citació bibliogràfica: | 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 |
Resum: | 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. |
Patrocinadors: | 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 |
Idioma: | eng |
Tipus: | info:eu-repo/semantics/article |
Revisió científica: | si |
Versió de l'editor: | http://dx.doi.org/10.1016/j.jelechem.2004.02.013 |
Apareix a la col·lecció: | INV - GEPE - Artículos de Revistas |
Arxius per aquest ítem:
Arxiu | Descripció | Tamany | Format | |
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Journal of Electroanalytical Chemistry 569 (2004) 53–60.pdf | Versión final (acceso restringido) | 254,11 kB | Adobe PDF | Obrir Sol·licitar una còpia |
pruebas_CN.pdf | Versión revisada (acceso libre) | 256,79 kB | Adobe PDF | Obrir Vista prèvia |
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