Author:
Stroud Rhonda M.,Long Jeffrey W.,Swider-Lyons Karen E.,Rolison Debra R.
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.
Publisher
Cambridge University Press (CUP)
Cited by
21 articles.
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