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Nanoscale Structural and Chemical Segregation in Pt50Ru50 Electrocatalysts

Published online by Cambridge University Press:  02 July 2020

Rhonda M. Stroud
Affiliation:
Surface Modification Branch, Naval Research Laboratory, Washington, DC, 20375
Jeffrey W. Long
Affiliation:
Surface Chemistry Branch, Naval Research Laboratory, Washington, DC, 20375
Karen E. Swider-Lyons
Affiliation:
Surface Chemistry Branch, Naval Research Laboratory, Washington, DC, 20375
Debra R. Rolison
Affiliation:
Surface Chemistry Branch, Naval Research Laboratory, Washington, DC, 20375

Abstract

To address how the chemical and structural heterogeneity of Pt50Ru50 nanoparticles affects methanol oxidation activity, we have employed an arsenal of transmission electron microscopy techniques (conventional bright field-imaging, selected area diffraction, atomic-resolution lattice imaging, electron-energy loss spectroscopy, and energy-dispersive x-ray spectroscopy) to characterize 2.5-nm particles in differing oxidation and hydration states. Our studies demonstrate that electrocatalysts containing a high fraction of Ru-rich hydrous oxide, as apposed to the anhydrous PtRu bimetallic alloy, have as much as 250x higher methanol oxidation activity

The nominally 2.5-nm Pt50Ru50 particles were studied in as-received, reduced and reoxidized forms. The reducing treatment consisted of 2 h at 100 °C in flowing 10% PL/argon mixture. For re-oxidation, the reduced particles were heated for 20 h at 100 °C in an H2O-saturated oxygen atmosphere. The particles were suspended in methanol, and pipetted onto holey-carboncoated Cu grids for TEM studies.

Type
Characterization of Catalysts (Organized by S. Bradley)
Copyright
Copyright © Microscopy Society of America 2001

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References

1.Long, J.W., Stroud, R.M., Swider-Lyons, K.E. and Rolison, D.R., J. Phys. Chem.B 104 (2000) 9772.CrossRefGoogle Scholar
2.Stroud, R.M., Long, J.W., Swider-Lyons, K.E. and Rolison, D.R., submitted to Microscopy & Microanalysis.Google Scholar
3.Rolison, D.R., Hagans, P.L., Swider, K.E., and Long, J.W., Langmuir 15 (1999) 774.CrossRefGoogle Scholar

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