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Transmission Electron Microscopy Studies of the Nanoscale Structure and Chemistry of Pt50Ru50 Electrocatalysts

Published online by Cambridge University Press:  28 March 2002

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

Abstract

The structural and chemical heterogeneity of 2.5-nm Pt50Ru50 electrocatalysts was studied by transmission electron microscopy using selected area diffraction, lattice imaging, electron-energy loss spectroscopy, and energy-dispersive X-ray spectroscopy. The catalysts with the highest methanol oxidation activities exhibit oxidation-induced phase separation on the nanoscale to form Pt-rich metal embedded in Ru-rich hydrous and anhydrous oxide. Reduction of the oxide-on-metal samples produces a true bimetallic face-centered cubic Pt50Ru50 alloy, with 275 times lower oxidation activity.

Type
Research Article
Copyright
© 2002 Microscopy Society of America

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