Sn@Pt and Rh@Pt core–shell nanoparticles synthesis for glycerol oxidation

The development and optimization of electrocatalysts for application in fuel cell systems have been the focus of a variety of studies where core–shell structures have been considered as a promising alternative among the materials studied. We synthesized core–shell nanoparticles of Sn x @Pt y and Rh...

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Published inJournal of applied electrochemistry Vol. 45; no. 2; pp. 139 - 150
Main Authors Pupo, Marilia M. S., López-Suárez, Franz E., Bueno-López, Agustín, Meneses, Cristiano T., Eguiluz, Katlin I. B., Salazar-Banda, Giancarlo R.
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 01.02.2015
Subjects
Chemistry
Chemistry and Materials Science
Electrochemical Processes
Electrochemistry
Industrial Chemistry/Chemical Engineering
Physical Chemistry
Research Article
Electrocatalysis
Core–shell
Glycerol oxidation
Fuel cells
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Summary:The development and optimization of electrocatalysts for application in fuel cell systems have been the focus of a variety of studies where core–shell structures have been considered as a promising alternative among the materials studied. We synthesized core–shell nanoparticles of Sn x @Pt y and Rh x @Pt y (Sn@Pt, Sn@Pt 2 , Sn@Pt 3 , Rh@Pt, Rh@Pt 2 , and Rh@Pt 3 ) through a reduction methodology using sodium borohydride. These nanoparticles were electrochemically characterized by cyclic voltammetry and further analyzed by cyclic voltammetry studying their catalytic activity toward glycerol electro-oxidation; chronoamperometry and potentiostatic polarization experiments were also carried out. The physical characterization was carried out by X-ray diffraction, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy. The onset potential for glycerol oxidation was shifted in 130 and 120 mV on the Sn@Pt 3 /C and Rh@Pt 3 /C catalysts, respectively, compared to commercial Pt/C, while the stationary pseudo-current density, taken at 600 mV, increased 2-fold and 5-fold for these catalysts related to Pt/C, respectively. Thus, the catalysts synthesized by the developed methodology have enhanced catalytic activity toward the electro-oxidation of glycerol, representing an interesting alternative for fuel cell systems.
ISSN:0021-891X
1572-8838
DOI:10.1007/s10800-014-0757-0