Spectroelectrochemical detection of specifically adsorbed cyanurate anions at gold electrodes with (111) orientation in contact with cyanate and cyanuric acid neutral solutions

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Title: Spectroelectrochemical detection of specifically adsorbed cyanurate anions at gold electrodes with (111) orientation in contact with cyanate and cyanuric acid neutral solutions
Authors: Cheuquepán, William | Rodes García, Antonio | Orts Mateo, José M. | Feliu, Juan M.
Research Group/s: Grupo de Espectroelectroquímica y Modelización (GEM) | Electroquímica de Superficies
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Au(111) | Cyanuric acid | ATR-SEIRAS | DFT | Cyanate
Knowledge Area: Química Física
Issue Date: 1-Sep-2017
Publisher: Elsevier
Citation: Journal of Electroanalytical Chemistry. 2017, 800: 167-175. doi:10.1016/j.jelechem.2017.02.015
Abstract: The adsorption and reactivity of cyanate at Au(111) single crystal and Au(111)-25 nm thin film electrodes is studied spectroelectrochemically in sodium perchlorate solutions and compared to those of cyanuric acid (C3N3O3H3). From the Surface Enhanced Infrared Reflection Absorption spectra obtained under Attenuated Total Reflection conditions (ATR-SEIRAS) it can be concluded that adsorbed cyanate species predominate at the electrode surface for low cyanate concentrations. However, for cyanate concentrations above 1 mM, the similarity of the ATR-SEIRA spectra with those obtained in cyanuric acid containing solutions indicates that some species coming from cyanuric acid is formed and adsorbed at the (111) gold surface sites as the result of an electroless trimerization reaction. Taking into account the results of Density Functional Theory (DFT) calculations, the experimental voltammetric and ATR-SEIRAS results agree with the formation of adlayers of specifically adsorbed triketo-monocyanurate species that adsorb perpendicular to the electrode surface.
Sponsor: The authors acknowledge the funding by Ministerio de Economía y Competitividad (projects CTQ2016-76221-P and CTQ2016-76231-C2-2-R) and the University of Alicante (VIGROB-044 and VIGROB-263). William Cheuquepán is grateful for the award of a F.P.I. grant associated to project CTQ2009-13142.
URI: http://hdl.handle.net/10045/68968
ISSN: 1572-6657 (Print) | 1873-2569 (Online)
DOI: 10.1016/j.jelechem.2017.02.015
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2017 Elsevier B.V.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.jelechem.2017.02.015
Appears in Collections:INV - GEM - Artículos de Revistas
INV - EQSUP - Artículos de Revistas

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