Formic acid electrooxidation on thallium-decorated shape-controlled platinum nanoparticles: an improvement in electrocatalytic activity

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Título: Formic acid electrooxidation on thallium-decorated shape-controlled platinum nanoparticles: an improvement in electrocatalytic activity
Autor/es: Busó-Rogero, Carlos | Perales-Rondón, Juan V. | Farias, Manuel J.S. | Vidal-Iglesias, Francisco J. | Solla-Gullón, José | Herrero, Enrique | 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: Formic acid electrooxidation | Thallium | Platinum nanoparticles | Electrocatalysts
Área/s de conocimiento: Química Física
Fecha de publicación: 27-feb-2014
Editor: Royal Society of Chemistry
Cita bibliográfica: Physical Chemistry Chemical Physics. 2014, Advance Article. doi:10.1039/C4CP00304G
Resumen: Thallium modified shape-controlled Pt nanoparticles were prepared and their electrocatalytic activity towards formic acid electrooxidation was evaluated in 0.5 M sulfuric acid. The electrochemical and in situ FTIR spectroscopic results show a remarkable improvement in the electrocatalytic activity, especially in the low potential region (around 0.1–0.2 V vs. RHE). Cubic Pt nanoparticles modified with Tl were found to be more active than the octahedral Pt ones in the entire range of Tl coverages and potential windows. In situ FTIR spectra indicate that the promotional effect produced by Tl results in the inhibition of the poisoning step leading to COads, thus improving the onset potential for the complete formic acid oxidation to CO2. Chronoamperometric experiments were also performed at 0.2 V to evaluate the stability of the electrocatalysts at constant potential. Finally, experiments with different concentrations of formic acid (0.05–1 M) were also carried out. In all cases, Tl-modified cubic Pt nanoparticles result to be the most active. All these facts reinforce the importance of controlling the surface structure of the electrocatalysts to optimize their electrocatalytic properties.
Patrocinador/es: This work has been financially supported by the MICINN (Spain) (project CTQ2010-16271) and Generalitat Valenciana (project PROMETEO/2009/045 – FEDER).
ISSN: 1463-9076 (Print) | 1463-9084 (Online)
DOI: 10.1039/C4CP00304G
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence
Revisión científica: si
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