285305 Structure Sensitivity of Oxygen Adsorption On Surface Structure Spread Single Crystals

Thursday, November 1, 2012: 3:55 PM
318 (Convention Center )
Timothy Lawton1, Vladimir Pushkarev2, E. Broitman2, Aaron Reinicker2, Charles Sykes3 and A.J. Gellman2, (1)Tufts University, (2)Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA, (3)Department of Chemistry, Tufts University, Medford, MA

The role of atomic surface structure in catalytic reactions requires a fundamental understanding to develop new catalysts. Surface Structure Spread Single Crystals (S4Cs) expose a continuous distribution of crystal planes across their surfaces. Each point on the S4Cs has a different local crystallographic orientation that can be determined from the shape of the S4Cs and the orientation of its bulk crystal lattice vectors. When coupled with spatially resolved surface analysis techniques, S4Cs can be used to study the effects of surface structure on surface chemistry across a broad, continuous distribution of crystal planes. In this work, the dissociative adsorption of O2 on Cu was studied using a Cu(111)±10° S4C. Scanning Tunneling Microscopy (STM) was used to analyze the surface structure and calculate the local step density at various points on the Cu(111)±10° S4C. Spatially resolved X-ray Photoelectron Spectroscopy (XPS) was performed to study the adsorption of O on ~80 different crystal planes of the Cu(111)±10° S4C. It was found that the O coverage adsorbed on the surface increased with increasing step density but was independent of the type of step.

Extended Abstract: File Not Uploaded
See more of this Session: Rational Catalyst Design II
See more of this Group/Topical: Catalysis and Reaction Engineering Division