Compositional Inhomogeneity and Corner Enrichment of Pt in Pt/Pd Bimetallic Nanoparticles

Lingxuan Peng, Richard P. Van Duyne, Laurence D. Marks*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Experimental results of a smooth composition gradient within Pt/Pd alloy nanoparticles with Pt enrichment at the corners are reported. We find that the Pt concentration gradually increases toward the outermost surface, and it appears different from the thermodynamically most stable configuration. We demonstrate that it is the result of reaction kinetics of both the reduction of precursors and growth of nanoparticles, by a growth model. We then explain that the corner Pt enrichment is a result of local thermodynamic control at the corners. This mixed control of kinetics and thermodynamics in bimetallic nanoparticle synthesis can lead to the formation of particles with a complex concentration profile, which could be interesting when these particles are used in catalytic applications. Our analysis is not simply a qualitative model but rather a relatively rigorous quantitative analysis of the composition as a function of the growth conditions, which can serve as a basis for improved reproducibility of synthesis for applications.

Original languageEnglish (US)
Pages (from-to)21069-21075
Number of pages7
JournalJournal of Physical Chemistry C
Volume120
Issue number37
DOIs
StatePublished - Sep 22 2016

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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