INVESTIGADORES
TROIANI Horacio Esteban
artículos
Título:
Agglomeration and Cleaning of Carbon Supported Palladium Nanoparticles in Electrochemical Environment
Autor/es:
CAUE MARTINS; PABLO FERNANDEZ; HORACIO TROIANI; MARÍA MARTINS; ANA ARENILLAS; GIUSEPPE CAMARA
Revista:
Electrocatalysis
Editorial:
Springer
Referencias:
Año: 2014 p. 204 - 212
ISSN:
1868-2529
Resumen:
Here we investigate the electrochemical behavior of Pd/C synthesized by
reduction with ethylene glycol in the presence of polyvinylpyrrolidone
(EG-PVP). EG-PVP produces nanoparticles (NPs)
with a narrow size distribution, but some of them remain covered by
impurities after the synthesis. After successive voltammetric cycles, NPs
become cleaner, but some agglomeration and structural modification
occur; these effects affect the electrochemical behavior of Pd/C in
different ways, so we used CO as a probe to better understand the
processes taking place. CO stripping shows that the general features of
the multiple oxidation peaks change with the number of cycles. Possibly,
CO and OH from different NPs
react when the particles agglomerate, contributing to CO stripping
changes. Finally, different active areas are found when the charges
involved in CO oxidation and PdO reduction are compared. Such
differences are rationalized in terms of a balance between the increase
of sites which promote the oxidation of CO and the loss of area provoked
by the growing of the particles.