Tailoring Au-core Pd-shell Pt-cluster nanoparticles for enhanced electrocatalytic activity

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TitreTailoring Au-core Pd-shell Pt-cluster nanoparticles for enhanced electrocatalytic activity
Type de publicationJournal Article
Nouvelles publications2011
AuteursFang, PP, Duan S, Lin XD, Anema JR, Li JF, Buriez O, Ding Y, Fan FR, Wu DY, Ren B, Wang ZL, Amatore C, Tian ZQ
JournalChemical Science
Volume2
Fascicule3
Pagination531-539
Numéro2041-6520
Accession NumberISI:000287364400021
Résumé

We have rationally synthesized and optimized catalytic nanoparticles consisting of a gold core, covered by a palladium shell, onto which platinum clusters are deposited (Au@Pd@Pt NPs). The amount of Pt and Pd used is extremely small, yet they show unusually high activity for electrooxidation of formic acid. The optimized structure has only 2 atomic layers of Pd and a half-monolayer equivalent of Pt (theta(Pt) approximate to 0.5) but a further increase in the loading of Pd or Pt will actually reduce catalytic activity, inferring that a synergistic effect exists between the three different nanostructure components (sphere, shell and islands). A combined electrochemical, surface-enhanced Raman scattering (SERS) and density functional theory (DFT) study of formic acid and CO oxidation reveals that our core-shell-cluster trimetallic nanostructure has some unique electronic and morphological properties, and that it could be the first in a new family of nanocatalysts possessing unusually high chemical reactivity. Our results are immediately applicable to the design of catalysts for direct formic acid fuel cells (DFAFCs).

URL<Go to ISI>://000287364400021
DOI10.1039/c0sc00489h
Importer un fichierTailoring Au-core Pd-shell Pt-cluster nanoparticles for enhanced electrocatalytic activity
Unité de rattachement: 
UMR 8640