Electroreduction of Oxygen on PdPt Alloy Nanocubes in Alkaline and Acidic Media

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Título: Electroreduction of Oxygen on PdPt Alloy Nanocubes in Alkaline and Acidic Media
Autor/es: Jukk, Kristel | Kongi, Nadezda | Tammeveski, Kaido | Solla-Gullón, José | Feliu, Juan M.
Grupo/s de investigación o GITE: Electroquímica de Superficies | Electroquímica Aplicada y Electrocatálisis
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Palabras clave: PdPt alloy nanocubes | Electrocatalysis | Oxygen reduction | Pt nanocubes | Pd nanocubes | Bimetallic catalysts
Área/s de conocimiento: Química Física
Fecha de publicación: oct-2017
Editor: Wiley-VCH Verlag GmbH & Co. KGaA
Cita bibliográfica: ChemElectroChem. 2017, 4(10): 2547-2555. doi:10.1002/celc.201700588
Resumen: The electrochemical kinetic behavior of the oxygen reduction reaction (ORR) on PdPt alloy nanocubes of various compositions is investigated in 0.1 M KOH and 0.1 M HClO4 solutions, adopting the rotating disk electrode (RDE) configuration. The PdPt nanocubes are prepared in the presence of polyvinylpyrrolidone and identified by using transmission electron microscopy (TEM). TEM images reveal that the PdPt alloy nanoparticles have a preferential cubic shape and the average particle size is approximately 8–10 nm. CO-stripping and cyclic voltammetry (CV) experiments are used for electrochemical cleaning and characterization of metal nanoparticles. The CV responses indicate alloy formation. In acidic media, Pd36Pt64 shows the highest specific activity (SA) for the ORR from the alloyed catalysts studied, but this activity is similar to that found with Pt and Pd nanocubes. However, in alkaline solution, the SA value for Pd72Pt28 is about two times higher than that of Pd and Pt nanocubes. The mechanistic pathway of O2 reduction on PdPt alloy nanocubes is analogous to that of pure Pd and Pt catalysts and the ORR proceeds via a 4-electron pathway in both electrolyte solutions.
Patrocinador/es: This research was financially supported by institutional research funding (IUT20-16) of the Estonian Ministry of Education and Research and by the Estonian Research Council (Grant No. 9323). This research was also supported by the EU through the European Regional Development Fund (TK141 “Advanced materials and high-technology devices for energy recuperation systems”). K.J. thanks the Archimedes Foundation for scholarship. J.M.F. acknowledges financial support from MINECO (Spain), project CTQ2016-76221-P. J.S.G. acknowledges financial support from VITC (Vicerrectorado de Investigación y Transferencia de Conocimiento) of the University of Alicante.
URI: http://hdl.handle.net/10045/70049
ISSN: 2196-0216
DOI: 10.1002/celc.201700588
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Revisión científica: si
Versión del editor: http://dx.doi.org/10.1002/celc.201700588
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