Web Release Date: July 6,
IR Spectroscopic Observation of Molecular Transport through Pt@CoO Yolk-Shell Nanostructures
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Contribution from the Surface Science Center, Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, Department of Chemistry, University of California, Riverside, CA 92521, and Department of Chemistry, University of California, Berkeley, CA 94720
Received April 13, 2007
Abstract:
FTIR spectroscopy has been used to monitor the transport of CO to the Pt cores of Pt@CoO nanoparticles forming CO/Pt species. It was found that external Pt sites are not present on the outer surfaces of the ~10 nm diameter nanostructures and that CO transports to Pt adsorption sites by an activated surface diffusion process through the CoO shells surrounding ~2 nm diameter Pt cores. The CO transport process is not due to gas-phase transport below 300 K. The weakly bound adsorbed CO/CoO species responsible for transport was directly observed at ~2147 cm-1 during transport through the CoO shells.
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