Study of the Pt (111) | electrolyte interface in the region close to neutral pH solutions by the laser induced temperature jump technique

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Título: Study of the Pt (111) | electrolyte interface in the region close to neutral pH solutions by the laser induced temperature jump technique
Autor/es: Sebastián, Paula | 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: Platinum single crystal | Pt (111) | Potential of zero charge | Potential of maximum entropy | Laser induced temperature jump method
Área/s de conocimiento: Química Física
Fecha de publicación: 20-feb-2017
Editor: Elsevier
Cita bibliográfica: Electrochimica Acta. 2017, 228: 667-676. doi:10.1016/j.electacta.2017.01.089
Resumen: The laser-induced temperature jump method is used to determine the potential of maximum entropy (pme) of a Pt(111) single crystal electrode in contact with an aqueous solution, in a wide pH range and in the absence of specifically adsorbed anions. For this purpose, buffer solutions composed of a mixture of NaF and HClO4 are used. The results are compared with those from non-buffered perchlorate solutions. The use of the NaF/HF buffer allows extending the pH range from 3 to 6, approaching the situation of a neutral pH. Laser experiments show that the pme appears located at nearly the same potential position in the whole pH range between 3 and 6. This value is around 300 mV vs SHE, in agreement with previous works. Moreover, the potential response to the fast thermal perturbation at high potentials, above the pme, indicates the presence of a slower contribution, resulting in a bipolar, non-monotonous, profile. Such behaviour is strongly affected by the presence of fluoride anion and/or hydrofluoric acid, thus evidencing a strong structural effect on interfacial water from these species. These results bring some light to the understanding of the interfacial properties in acid-neutral conditions, and also show the influence of different non-specifically adsorbed anions on the interfacial properties that cannot be evidenced only by cyclic voltammetry.
Patrocinador/es: Support from MINECO (Spain) through project CTQ2016-76221-P and Generalitat Valenciana through project PROMETEOII/2014/013 is greatly acknowledged. RMH thankfully acknowledges support from Generalitat Valenciana under the Santiago Grisolia Program (GRISOLIA/2013/008). PS thankfully acknowledges to the MEC (Spain) for the award of a FPU grant.
ISSN: 0013-4686 (Print) | 1873-3859 (Online)
DOI: 10.1016/j.electacta.2017.01.089
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2017 Elsevier Ltd.
Revisión científica: si
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Aparece en las colecciones:INV - EQSUP - Artículos de Revistas

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