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Journal of Nanoparticle Research

, Volume 13, Issue 12, pp 6347–6364 | Cite as

Tuning of size and shape of Au–Pt nanocatalysts for direct methanol fuel cells

  • Simona E. Hunyadi Murph
  • Catherine J. Murphy
  • Hector R. Colon-Mercado
  • Ricardo D. Torres
  • Katie J. Heroux
  • Elise B. Fox
  • Lucas B. Thompson
  • Richard T. Haasch
Research Paper

Abstract

In this article, we report the precise control of the size, shape, and surface morphology of Au–Pt nanocatalysts (cubes, blocks, octahedrons, and dogbones) synthesized via a seed-mediated approach. Gold “seeds” of different aspect ratios (1–4.2), grown by a silver-assisted approach, were used as templates for high-yield production of novel Au–Pt nanocatalysts at a low temperature (40 °C). Characterization by electron microscopy (SEM, TEM, HRTEM), energy dispersive X-ray analysis, UV–Vis spectroscopy, zeta-potential (surface charge), atomic force microscopy, X-ray photoelectron spectroscopy, and inductively coupled plasma mass spectrometry were used to better understand their physico-chemical properties, preferred reactivities and underlying nanoparticle growth mechanism. A rotating disk electrode was employed to evaluate the Au–Pt nanocatalysts electrochemical performance in the oxygen reduction reaction (ORR) and the methanol oxidation reaction of direct methanol fuel cells. The results indicate the Au–Pt dogbones are partially and in some cases completely unaffected by methanol poisoning during the evaluation of the ORR. The ORR performance of the octahedron particles in the absence of MeOH is superior to that of the Au–Pt dogbones and Pt-black; however, its performance is affected by the presence of MeOH.

Keywords

Gold-platinum nanocatalysts Direct methanol fuel cells Anisotropic nanostructures Energy conversion 

Abbreviations

CTAB

Cetyltrimethylammonium bromide

MOR

Methanol oxidation reaction

ORR

Oxygen reduction reaction

Notes

Acknowledgments

The authors gratefully acknowledge the financial support for this study by the Savannah River National Laboratory LDRD-DOE. The authors would like to thank Dr. Kimberly Roberts, Prof. Apparao Rao, Dr. Robert Lascola, Dr. Charles Chuck, and the staff of electron microscopy facility at Clemson for making their instrumentation available to us.

Supplementary material

11051_2011_449_MOESM1_ESM.doc (1 mb)
Supplementary material 1 (DOC 1027 kb)

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Copyright information

© Springer Science+Business Media B.V. (outside the USA) 2011

Authors and Affiliations

  • Simona E. Hunyadi Murph
    • 1
  • Catherine J. Murphy
    • 2
  • Hector R. Colon-Mercado
    • 1
  • Ricardo D. Torres
    • 1
  • Katie J. Heroux
    • 1
  • Elise B. Fox
    • 1
  • Lucas B. Thompson
    • 2
  • Richard T. Haasch
    • 3
  1. 1.Savannah River National LaboratoryAikenUSA
  2. 2.Department of ChemistryUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  3. 3.Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-ChampaignUrbanaUSA

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