Interfacial water reorganization as a pH-dependent descriptor of the hydrogen evolution rate on platinum electrodes
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Título: | Interfacial water reorganization as a pH-dependent descriptor of the hydrogen evolution rate on platinum electrodes |
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Autor/es: | Ledezma-Yanez, Isis | Wallace, W. David Z. | Sebastián, Paula | Climent, Victor | Feliu, Juan M. | Koper, Marc T.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: | Hydrogen evolution | Platinum electrodes | Electrocatalysis | pH-dependent | Pt(111) |
Área/s de conocimiento: | Química Física |
Fecha de publicación: | 20-mar-2017 |
Editor: | Macmillan Publishers |
Cita bibliográfica: | Nature Energy. 2017, 2: 17031. doi:10.1038/nenergy.2017.31 |
Resumen: | Hydrogen evolution on platinum is a key reaction for electrocatalysis and sustainable energy storage, yet its pH-dependent kinetics are not fully understood. Here we present a detailed kinetic study of hydrogen adsorption and evolution on Pt(111) in a wide pH range. Electrochemical measurements show that hydrogen adsorption and hydrogen evolution are both slow in alkaline media, consistent with the observation of a shift in the rate-determining step for hydrogen evolution. Adding nickel to the Pt(111) surface lowers the barrier for hydrogen adsorption in alkaline solutions and thereby enhances the hydrogen evolution rate. We explain these observations with a model that highlights the role of the reorganization of interfacial water to accommodate charge transfer through the electric double layer, the energetics of which are controlled by how strongly water interacts with the interfacial field. The model is supported by laser-induced temperature-jump measurements. Our model sheds light on the origin of the slow kinetics for the hydrogen evolution reaction in alkaline media. |
Patrocinador/es: | This work was supported by a TOP grant from the Netherlands Organization for Scientific Research (NWO). Support from MINECO (Spain) through project CTQ2013-44083-P is acknowledged. |
URI: | http://hdl.handle.net/10045/73769 |
ISSN: | 2058-7546 |
DOI: | 10.1038/nenergy.2017.31 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2017 Macmillan Publishers Limited, part of Springer Nature |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1038/nenergy.2017.31 |
Aparece en las colecciones: | INV - EQSUP - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2017_Ledezma-Yanez_etal_NatureEnergy_final.pdf | Versión final (acceso restringido) | 607,69 kB | Adobe PDF | Abrir Solicitar una copia |
2017_Ledezma-Yanez_etal_NatureEnergy_revised.pdf | Versión revisada (acceso abierto) | 1,45 MB | Adobe PDF | Abrir Vista previa |
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