INFIQC   05475
INSTITUTO DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Unidad Ejecutora - UE
artículos
Título:
Electrochemical synthesis of palladium nanoparticles in PVP solutions and their catalytic activity in Suzuki and Heck reactions in aqueous medium
Autor/es:
PAULA M. UBERMAN; LUIS A. PÉREZ; SANDRA E. MARTÍN; GABRIELA I. LACCONI
Revista:
RSC Advances
Editorial:
Royal Society of Chemistry
Referencias:
Año: 2014 p. 12330 - 12341
ISSN:
2046-2069
Resumen:
Small palladium nanoparticles (PdNPs) with large-surface area were synthesized in aqueous media in the presence of poly(N-vinylpyrrolidone) (PVP) using a simple electrochemical method. Electroreduction of Pd(II) species on a vitreous carbon electrode was performed by application of a current density pulse and the resulting PVP-Pd dispersion was formed. Highly concentrated PdNPs suspensions, stabilized with PVP molecules were obtained in short time at room temperature. Size and morphology of the nanostructures obtained depend on the current density (30 to 8 nm PdNPs, for current densities in the -100 and -350 mA cm-2 range). Nanoparticles structure with large-surface area was established by transmission electron microscopy. The surface area of PdNPs results notably increased when the current density is more negative.The resulting PVP-stabilized PdNPs showed a very high catalytic activity when they were used in Suzuki and Heck reactions. With elevated TON and TOF, and in aqueous medium, this catalytic system proved to be an environmental friendly alternative to conventional Pd catalyst.