Oxygen electroreduction on carbon-supported Pd nanocubes in acid solutions

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Título: Oxygen electroreduction on carbon-supported Pd nanocubes in acid solutions
Autor/es: Erikson, Heiki | Lüsi, Madis | Sarapuu, Ave | 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: Oxygen reduction | Electrocatalysis | Pd nanoparticles | Pd nanocubes | Supported catalysts
Área/s de conocimiento: Química Física
Fecha de publicación: 10-ene-2016
Editor: Elsevier
Cita bibliográfica: Electrochimica Acta. 2016, 188: 301-308. doi:10.1016/j.electacta.2015.11.125
Resumen: The oxygen reduction reaction (ORR) was studied on carbon-supported cubic palladium nanoparticles of different sizes (∼30 nm, ∼10 nm and ∼7 nm). Cetyltrimethylammonium bromide (CTAB) and polyvinylpyrrolidone (PVP) were used as capping agents to prepare the nanocubes and Pd content in the catalyst samples was 20 and 50 wt%. The surface morphology of the prepared materials was studied by transmission electron microscopy (TEM). The catalyst materials were electrochemically characterised by cyclic voltammetry and CO stripping experiments. The rotating disk electrode (RDE) method was employed for ORR studies in 0.5 M H2SO4 and 0.1 M HClO4 solutions. The ORR results revealed that the specific activity of cubic Pd nanoparticles is higher than that of spherical Pd particles and does not depend on the Pd content in the catalyst, but decreases with decreasing the size of Pd nanocubes. Mass activity of Pd nanocubes increased with decreasing the particle size. The ORR proceeds mainly via 4-electron pathway and the reaction mechanism is similar to that on bulk Pd.
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). HE thanks the Archimedes Foundation for scholarship. JMF acknowledges financial support from MINECO (Spain), project CTQ2013-44083-P.
URI: http://hdl.handle.net/10045/52018
ISSN: 0013-4686 (Print) | 1873-3859 (Online)
DOI: 10.1016/j.electacta.2015.11.125
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2015 Elsevier Ltd.
Revisión científica: si
Versión del editor: http://dx.doi.org/10.1016/j.electacta.2015.11.125
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