Thermodynamic studies of anion adsorption at the Pt(111) electrode surface from glycolic acid solutions

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Title: Thermodynamic studies of anion adsorption at the Pt(111) electrode surface from glycolic acid solutions
Authors: Arán-Ais, Rosa M. | Herrero, Enrique | Feliu, Juan M.
Research Group/s: Electroquímica de Superficies
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Glycolic acid | Pt single crystals electrodes | Stepped surfaces | Thermodynamic study | In situ FTIR
Knowledge Area: Química Física
Issue Date: Jan-2015
Publisher: Springer Berlin Heidelberg
Citation: Journal of Solid State Electrochemistry. 2015, 19(1): 13-21. doi:10.1007/s10008-014-2646-1
Abstract: Kinetic glycolic acid (GA) oxidation and thermodynamic glycolate adsorption have been studied on Pt single crystal electrodes. The voltammetric profiles of Pt(111), Pt(100), and Pt(110) in 0.1 M GA are shown, and the effect of the inclusion of steps on the Pt(111) surface has been studied by cyclic voltammetry. For Pt(111) electrode, different concentrations and sweep rates have been applied, revealing that both adsorption and oxidation processes take place. By establishing the appropriate conditions, a complete thermodynamic analysis has been performed by using the electrode potential and the charge as independent variables. Total charge density curves, surface pressure at total charge density and at constant electrode potential were determined to calculate the Gibbs excess and the charge number at constant electrode potential for glycolate adsorption on Pt(111). Maximum glycolate coverage on the surface reaches a value of ∼6.0 × 1014 ions/cm2. Spectroscopic results show the formation of CO2 during the oxidation of glycolic acid, indicating that the cleavage of the C–C bond occurs during the oxidation process.
Sponsor: The work was carried out under the financial support by the MINECO (Spain) (project CTQ2013-44083-P) and Generalitat Valenciana (project PROMETEOII/2014/013).
URI: http://hdl.handle.net/10045/53177
ISSN: 1432-8488 (Print) | 1433-0768 (Online)
DOI: 10.1007/s10008-014-2646-1
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Springer-Verlag Berlin Heidelberg 2014. The final publication is available at Springer via http://dx.doi.org/10.1007/s10008-014-2646-1
Peer Review: si
Publisher version: http://dx.doi.org/10.1007/s10008-014-2646-1
Appears in Collections:INV - EQSUP - Artículos de Revistas

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