The effect of Pt surface orientation on the oscillatory electro-oxidation of glycerol
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Título: | The effect of Pt surface orientation on the oscillatory electro-oxidation of glycerol |
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Autor/es: | Del Colle, Vinicius | Melle, Gabriel | Previdello, Bruno A.F. | Feliu, Juan M. | Varela, Hamilton | Tremiliosi-Filho, Germano |
Grupo/s de investigación o GITE: | Electroquímica de Superficies |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica |
Palabras clave: | Glycerol electro-oxidation | Electrolyte concentration basal Pt(hkl) | Stepped Surfaces | Cyclic Voltammetry | Chronoamperometry | Potential oscillations |
Fecha de publicación: | 28-oct-2022 |
Editor: | Elsevier |
Cita bibliográfica: | Journal of Electroanalytical Chemistry. 2022, 926: 116934. https://doi.org/10.1016/j.jelechem.2022.116934 |
Resumen: | In the present paper, we have studied the influence of (bi)sulfate anion (0.1 and 0.5 M) on the electro-oxidation of glycerol on basal Pt(hkl) and stepped surfaces belonging to the series of Pt(S)[n(1 1 1) × (1 1 1)]. Cyclic voltammograms and derivative voltammetry pointed out that the catalytic activity decreases for Pt(1 1 1) and Pt(1 1 0) and, to a minor extent, for stepped surfaces in 0.5 mol/L H2SO4. Chronoamperometric curves demonstrated that above 0.60 V (vs RHE), for both concentrations (0.1 and 0.5 mol/L H2SO4), stepped surfaces and Pt(1 1 0) showed greater ability to catalyze the glycerol electro-oxidation in comparison with Pt(1 1 1). Potential oscillations were mapped along with slow galvanodynamic sweeps and studied at constant current. For Pt(1 1 1), no oscillations were found in the galvanodynamic regime, however, under the galvanostatic regime, period 1 oscillations were observed after a long induction period. The oscillations showed a very similar profile for stepped surfaces, even for the Pt(3 3 2) surface, which has a high density of (1 1 0) steps. Pattern changes were observed only for Pt(1 1 0) compared to other surfaces. Therefore, we conclude that (1 1 0) step sites influence the oscillatory behavior, thus the insertion of the steps favors the path of formation of inactive species, which compete for the same catalytic sites in a given potential region. The extinction of the mechanism oscillatory occurs differently due to the intrinsic characteristics of each surface electrode for the formation of (hydro)oxides. |
Patrocinador/es: | The authors acknowledge FAPESP (Grants No. 2013/16930-7 and 2019/22183-6), FAPEAL (process 60030-001076/2016), CAPES - Brasil (CAPES, Grant No. 0001, and for the scholarship, GBM, 88887.341974/2019-00). HV (Grant No. 306060/2017-5) and GTF (Grant No. 313455/2021-0) acknowledge CNPq for financial support. We gratefully acknowledge the support of the RCGI – Research Centre for Gas Innovation, hosted by the University of São Paulo (USP) and sponsored by FAPESP (2014/50279-4 and 2020/15230-5) and Shell Brazil, and the strategic importance of the support given by ANP (Brazil’s National Oil, Natural Gas, and Biofuels Agency) through the R&D levy regulation. |
URI: | http://hdl.handle.net/10045/129060 |
ISSN: | 1572-6657 (Print) | 1873-2569 (Online) |
DOI: | 10.1016/j.jelechem.2022.116934 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2022 Elsevier B.V. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1016/j.jelechem.2022.116934 |
Aparece en las colecciones: | INV - EQSUP - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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Del-Colle_etal_2022_JElectroanalChem_final.pdf | Versión final (acceso restringido) | 4,37 MB | Adobe PDF | Abrir Solicitar una copia |
Del-Colle_etal_2022_JElectroanalChem_preprint.pdf | Preprint (acceso abierto) | 1,16 MB | Adobe PDF | Abrir Vista previa |
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