Investigation of the interfacial properties of platinum stepped surfaces using peroxodisulfate reduction as a local probe
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Título: | Investigation of the interfacial properties of platinum stepped surfaces using peroxodisulfate reduction as a local probe |
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Autor/es: | Martínez-Hincapié, Ricardo | Climent, Victor | Feliu, Juan M. |
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: | Peroxodisulfate reduction | Platinum stepped surfaces | Potential of zero charge | Free charge | Water structure |
Área/s de conocimiento: | Química Física |
Fecha de publicación: | 1-jun-2019 |
Editor: | Elsevier |
Cita bibliográfica: | Electrochimica Acta. 2019, 307: 553-563. doi:10.1016/j.electacta.2019.03.198 |
Resumen: | Peroxodisulfate (PDS) reduction has been investigated by electrochemical and FTIR techniques in a wide pH range, on platinum stepped single crystals electrodes vicinal to the (111) pole. PDS reduction is a structure-sensitive reaction and proceeds on well differentiated potential regions for terrace and step sites. This fact allows gaining local information about the individual behavior of those sites. The reaction proceeds at appreciable rate in a narrow potential range, being inhibited in the low and high potential regions of the voltammogram. The inhibition of the reaction at low potentials is most likely associated with a change in the sign of the charge on the electrode, from positive to negative. Therefore, PDS reduction gives an approximate indication of the position of the potential of zero free charge (pzfc). In this way, two local values of pzfc, associated with terrace and steps sites, can be determined. Such values of local pzfc are compared with the local values of potential of maximum entropy (pme) of double layer formation deduced from laser induced T-jump experiment. Good agreement between both magnitudes is found, especially for terraces. The local pzfc on terraces shifts to more positive potentials as the terrace length diminishes, while the local pzfc for steps remains constant. The inhibition of PDS reduction at high potentials can also be related with a second inversion in the sign of the electrode charge. Therefore, PDS reduction can be used to determine a second pzfc on the (111) terraces at high potentials, revealing a non-monotonic charge – potential relationship. Spectroscopic experiments allow the identification of the species involved in PDS reduction. |
Patrocinador/es: | The authors acknowledge support from the Ministerio de Economía, Industria y Competitividad, Spain (CTQ2016-76221-P). |
URI: | http://hdl.handle.net/10045/91552 |
ISSN: | 0013-4686 (Print) | 1873-3859 (Online) |
DOI: | 10.1016/j.electacta.2019.03.198 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2019 Elsevier Ltd. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1016/j.electacta.2019.03.198 |
Aparece en las colecciones: | INV - EQSUP - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2019_Martinez-Hincapie_etal_ElectActa_final.pdf | Versión final (acceso restringido) | 1,95 MB | Adobe PDF | Abrir Solicitar una copia |
2019_Martinez-Hincapie_etal_ElectActa_accepted.pdf | Accepted Manuscript (acceso abierto) | 1,09 MB | Adobe PDF | Abrir Vista previa |
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