Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-27T13:53:45.667Z Has data issue: false hasContentIssue false
  • English
  • Français

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 ,
Jeffrey W. Long ,
Karen E. Swider-Lyons  and
Debra R. Rolison
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
Get access

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.

Keywords

TEMelectrocatalystsPt50Ru50nanostructuresphase separationcatalystsoxidation
Type
Research Article
Information
Microscopy and Microanalysis , Volume 8 , Issue 1 , February 2002 , pp. 50 - 57
Copyright
© 2002 Microscopy Society of America

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)