The Role of Defects in the Local Reaction Kinetics of CO Oxidation on Low-Index Pd Surfaces

Overview

Journal J Phys Chem C Nanomater Interfaces

Publisher American Chemical Society

Date 2013 Jun 21

PMID 23785524

Citations 10

Authors

D Vogel

C Spiel

M Schmid

M Stoger-Pollach

R Schlogl

Y Suchorski

G Rupprechter

Affiliations

Soon will be listed here.

Abstract

The role of artificially created defects and steps in the local reaction kinetics of CO oxidation on the individual domains of a polycrystalline Pd foil was studied by photoemission electron microscopy (PEEM), mass spectroscopy (MS), and scanning tunneling microscopy (STM). The defects and steps were created by STM-controlled Ar sputtering and the novel PEEM-based approach allowed the simultaneous determination of local kinetic phase transitions on differently oriented μm-sized grains of a polycrystalline sample. The independent (single-crystal-like) reaction behavior of the individual Pd() domains in the 10 mbar pressure range changes upon Ar sputtering to a correlated reaction behavior, and the reaction fronts propagate unhindered across the grain boundaries. The defect-rich surface shows also a significantly higher CO tolerance as reflected by the shift of both the global (MS-measured) and the local (PEEM-measured) kinetic diagrams toward higher CO pressure.

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