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Abstract:

We describe a novel strategy for the controlled fabrication of well-defined multilayer films incorporating a polyoxomolybdate anion (PMo12O403-, POM) via ion exchange on Au electrodes. Composite films were thoroughly characterized by ellipsometry, X-ray photoelectron spectroscopy (XPS), FTIR-ATR, quartz crystal microbalance (QCM) and cyclic voltammetry (CV). XPS and FTIR-ATR measurements showed that the Keggin structure of polyoxomolybdates is maintained as they are incorporated into the film. QCM experiments demonstrated that larger amounts of POM are incorporated into thicker film electrodes. EQCM and XPS measurements further showed that part of the film is delaminated when the modified electrodes were submerged in acid or basic solutions, but after this initial loss of mass the electrodes remain stable in time and with electrochemical use. POM-modified electrodes showed a pH-dependent electrochemical behavior, with peak potentials shifting by -60 mV pH-1, characteristic of a 2e/2H+ redox process at room temperature. Furthermore, our results suggest that POM molecules in the film are not decomposed when the electrodes are immersed in solutions with pH = 4.8 a key finding as POM molecules in solution suffer from complete hydrolysis at this pH value. Finally, the performance of these POM-modified electrodes as electrocatalysts was assessed via the reduction of nitrite, chlorate and peroxodisulfate. © 2012 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Formation, characterization and electrocatalytic activity of layer-by-layer self-assembled films containing polyoxomolybdate over Au surfaces
Autor:Völker, E.; Calvo, E.J.; Williams, F.J.
Filiación:Departamento de Química Inorgánica, Analítica y Química-Física, INQUIMAE-CONICET, Ciudad Universitaria, Buenos Aires CP1428, Argentina
Palabras clave:Electrocatalysis; Ion exchange; Layer-by-layer; Polyoxomolybdate; Self assembly; Composite films; Cyclic voltammetry; Electrocatalysis; Electrocatalysts; Gold; Ion exchange; Molecules; Multilayer films; Photoelectrons; Self assembly; X ray photoelectron spectroscopy; Au electrodes; Au surfaces; Basic solutions; Electrocatalytic activity; Electrochemical behaviors; Film electrodes; FT-IR-ATR; Initial loss; Keggin structure; Layer-by-layers; Modified electrodes; Novel strategies; Peak potentials; Peroxodisulfate; pH value; PH-dependent; PMo12O403; Polyoxomolybdates; Redox process; Room temperature; Self assembled films; XPS measurements; Electrochemical electrodes
Año:2012
Volumen:673
Página de inicio:1
Página de fin:7
DOI: http://dx.doi.org/10.1016/j.jelechem.2012.03.014
Título revista:Journal of Electroanalytical Chemistry
Título revista abreviado:J Electroanal Chem
ISSN:15726657
CODEN:JECHE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15726657_v673_n_p1_Volker

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Citas:

---------- APA ----------
Völker, E., Calvo, E.J. & Williams, F.J. (2012) . Formation, characterization and electrocatalytic activity of layer-by-layer self-assembled films containing polyoxomolybdate over Au surfaces. Journal of Electroanalytical Chemistry, 673, 1-7.
http://dx.doi.org/10.1016/j.jelechem.2012.03.014
---------- CHICAGO ----------
Völker, E., Calvo, E.J., Williams, F.J. "Formation, characterization and electrocatalytic activity of layer-by-layer self-assembled films containing polyoxomolybdate over Au surfaces" . Journal of Electroanalytical Chemistry 673 (2012) : 1-7.
http://dx.doi.org/10.1016/j.jelechem.2012.03.014
---------- MLA ----------
Völker, E., Calvo, E.J., Williams, F.J. "Formation, characterization and electrocatalytic activity of layer-by-layer self-assembled films containing polyoxomolybdate over Au surfaces" . Journal of Electroanalytical Chemistry, vol. 673, 2012, pp. 1-7.
http://dx.doi.org/10.1016/j.jelechem.2012.03.014
---------- VANCOUVER ----------
Völker, E., Calvo, E.J., Williams, F.J. Formation, characterization and electrocatalytic activity of layer-by-layer self-assembled films containing polyoxomolybdate over Au surfaces. J Electroanal Chem. 2012;673:1-7.
http://dx.doi.org/10.1016/j.jelechem.2012.03.014