The voltammetry of surfaces vicinal to Pt{110}: Structural complexity simplified by CO cooling
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Título: | The voltammetry of surfaces vicinal to Pt{110}: Structural complexity simplified by CO cooling |
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Autor/es: | Attard, Gary A. | Hunter, Katherine | Wright, Edward | Sharman, Jonathan | Martínez-Hincapié, Ricardo | 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: | Pt{110} | Cyclic voltammetry | Stepped surfaces | Electrosorption |
Área/s de conocimiento: | Química Física |
Fecha de publicación: | 15-may-2017 |
Editor: | Elsevier |
Cita bibliográfica: | Journal of Electroanalytical Chemistry. 2017, 793: 137-146. doi:10.1016/j.jelechem.2016.10.005 |
Resumen: | By flame-annealing and cooling a series of Pt n{110} × {111} and Pt n{110} × {100} single crystal electrodes in a CO ambient, new insights into the nature of the electrosorption processes associated with Pt{110} voltammetry in aqueous acidic media are elucidated. For Pt n{110} × {111} electrodes, a systematic change in the intensities of so-called hydrogen underpotential (Hupd) and oxide adsorption voltammetric peaks (for two dimensionally ordered (1 × 1) terraces and linear {111} × {111}step sites) point to a lack of surface reconstruction with all surfaces adopting a (1 × 1) configuration. This is in contrast to hydrogen cooled analogues which give rise to significant residual surface disorder, probably associated with the excess 50% of atoms remaining atop of the surface upon deconstruction of the {110} − (1 × 2) terrace phase. In contrast, Pt n{110} × {100} stepped electrodes, when cooled in gaseous CO following flame-annealing, show a marked tendency towards surface reconstruction, even at low step densities. Variations in potential of the Pt{110}-(1 × 1) Hupd electrosorption peaks as a function of specific ion adsorption strength and pH point to weak specific adsorption for both anions (including perchlorate and fluoride) and cations (including Na+ and K+). CO charge-displacement measurements of the potential of zero total charge (PZTC) allow inferences to be made concerning the nature of the electrosorbed species in the hydrogen underpotential deposition (Hupd) region. Hence, a coherent interpretation of the complex voltammetric phenomena often displayed by platinum surfaces vicinal to the {110} plane is proposed. |
Patrocinador/es: | GAA acknowledges the financial support of the EPSRC towards a studentship for KH. RMH thankfully acknowledges support from Generalitat Valenciana under the Santiago Grisolia Program (GRISOLIA/2013/008). Partial support from MINECO (Spain) Project CTQ 2013-44083-P is greatly acknowledged. |
URI: | http://hdl.handle.net/10045/68570 |
ISSN: | 1572-6657 (Print) | 1873-2569 (Online) |
DOI: | 10.1016/j.jelechem.2016.10.005 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2016 Elsevier B.V. |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1016/j.jelechem.2016.10.005 |
Aparece en las colecciones: | INV - EQSUP - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2017_Attard_etal_JElectrChem_final.pdf | Versión final (acceso restringido) | 2,58 MB | Adobe PDF | Abrir Solicitar una copia |
2017_Attard_etal_JElectrChem_preprint.pdf | Preprint (acceso abierto) | 1,62 MB | Adobe PDF | Abrir Vista previa |
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