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
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.
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
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Aparece en las colecciones:INV - EQSUP - Artículos de Revistas

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